The Experts below are selected from a list of 1935 Experts worldwide ranked by ideXlab platform
Trung Q. Duong - One of the best experts on this subject based on the ideXlab platform.
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Efficient Key Generation by Exploiting Randomness From Channel Responses of Individual Ofdm Subcarriers
IEEE Transactions on Communications, 2016Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:Key generation from the randomness of wireless channels is a promising technique to establish a secret cryptographic key securely between legitimate users. This paper proposes a new approach to extract keys efficiently from the channel responses of individual orthogonal frequency-division multiplexing (Ofdm) Subcarriers. The efficiency is achieved by: 1) fully exploiting randomness from time and frequency domains and 2) improving the cross-correlation of the channel measurements. Through the theoretical modeling of the time and frequency autocorrelation relationship of the Ofdm subcarrier’s channel responses, we can obtain the optimal probing rate and use multiple uncorrelated Subcarriers as random sources. We also study the effects of non-simultaneous measurements and noise on the cross-correlation of the channel measurements. We find that the cross-correlation is mainly impacted by noise effects in a slow fading channel and use a low-pass filter to reduce the key disagreement rate and extend the system’s working signal-to-noise ratio range. The system is evaluated in terms of randomness, key generation rate, and key disagreement rate, verifying that it is feasible to extract randomness from both time and frequency domains of the Ofdm subcarrier’s channel responses.
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GLOBECOM Workshops - Verification of Key Generation from Individual Ofdm Subcarrier's Channel Response
2015 IEEE Globecom Workshops (GC Wkshps), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:This paper presents a key generation system derived from the channel response of individual subcarrier in orthogonal frequency-division multiplexing (Ofdm) systems. Practical aspects of the security were investigated by implementing our key generation scheme on a wireless open-access research platform (WARP), which enables us to obtain channel estimation of individual Ofdm Subcarriers, a feature not currently available in most commercial wireless interface cards. Channel response of individual Ofdm subcarrier is usually a wide sense stationary random process, which allows us to find the optimal probing period and maximize the key generation rate. The implementation requires cross layer design as it involves interaction between physical and MAC layer. We have experimentally verified the feasibility and principles of key generation, and also evaluated the performance of our system in terms of randomness, key generation rate and key disagreement rate, which proves that Ofdm subcarrier's channel responses are valid for key generation.
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ICASSP - An effective key generation system using improved channel reciprocity
2015 IEEE International Conference on Acoustics Speech and Signal Processing (ICASSP), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:In physical layer security systems there is a clear need to exploit the radio link characteristics to automatically generate an encryption key between two end points. The success of the key generation depends on the channel reciprocity, which is impacted by the non-simultaneous measurements and the white nature of the noise. In this paper, an Ofdm Subcarriers' channel responses based key generation system with enhanced channel reciprocity is proposed. By theoretically modelling the Ofdm Subcarriers' channel responses, the channel reciprocity is modelled and analyzed. A low pass filter is accordingly designed to improve the channel reciprocity by suppressing the noise. This feature is essential in low SNR environments in order to reduce the risk of the failure of the information reconciliation phase during key generation. The simulation results show that the low pass filter improves the channel reciprocity, decreases the key disagreement, and effectively increases the success of the key generation.
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An effective key generation system using improved channel reciprocity
2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:In physical layer security systems there is a clear need to exploit the radio link characteristics to automatically generate an encryption key between two end points. The success of the key generation depends on the channel reciprocity, which is impacted by the non-simultaneous measurements and the white nature of the noise. In this paper, an Ofdm Subcarriers' channel responses based key generation system with enhanced channel reciprocity is proposed. By theoretically modelling the Ofdm Subcarriers' channel responses, the channel reciprocity is modelled and analyzed. A low pass filter is accordingly designed to improve the channel reciprocity by suppressing the noise. This feature is essential in low SNR environments in order to reduce the risk of the failure of the information reconciliation phase during key generation. The simulation results show that the low pass filter improves the channel reciprocity, decreases the key disagreement, and effectively increases the success of the key generation.
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Verification of Key Generation from Individual Ofdm Subcarrier's Channel Response
2015 IEEE Globecom Workshops (GC Wkshps), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:This paper presents a key generation system derived from the channel response of individual subcarrier in orthogonal frequency-division multiplexing (Ofdm) systems. Practical aspects of the security were investigated by implementing our key generation scheme on a wireless open-access research platform (WARP), which enables us to obtain channel estimation of individual Ofdm Subcarriers, a feature not currently available in most commercial wireless interface cards. Channel response of individual Ofdm subcarrier is usually a wide sense stationary random process, which allows us to find the optimal probing period and maximize the key generation rate. The implementation requires cross layer design as it involves interaction between physical and MAC layer. We have experimentally verified the feasibility and principles of key generation, and also evaluated the performance of our system in terms of randomness, key generation rate and key disagreement rate, which proves that Ofdm subcarrier's channel responses are valid for key generation.
Junqing Zhang - One of the best experts on this subject based on the ideXlab platform.
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Efficient Key Generation by Exploiting Randomness From Channel Responses of Individual Ofdm Subcarriers
IEEE Transactions on Communications, 2016Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:Key generation from the randomness of wireless channels is a promising technique to establish a secret cryptographic key securely between legitimate users. This paper proposes a new approach to extract keys efficiently from the channel responses of individual orthogonal frequency-division multiplexing (Ofdm) Subcarriers. The efficiency is achieved by: 1) fully exploiting randomness from time and frequency domains and 2) improving the cross-correlation of the channel measurements. Through the theoretical modeling of the time and frequency autocorrelation relationship of the Ofdm subcarrier’s channel responses, we can obtain the optimal probing rate and use multiple uncorrelated Subcarriers as random sources. We also study the effects of non-simultaneous measurements and noise on the cross-correlation of the channel measurements. We find that the cross-correlation is mainly impacted by noise effects in a slow fading channel and use a low-pass filter to reduce the key disagreement rate and extend the system’s working signal-to-noise ratio range. The system is evaluated in terms of randomness, key generation rate, and key disagreement rate, verifying that it is feasible to extract randomness from both time and frequency domains of the Ofdm subcarrier’s channel responses.
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GLOBECOM Workshops - Verification of Key Generation from Individual Ofdm Subcarrier's Channel Response
2015 IEEE Globecom Workshops (GC Wkshps), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:This paper presents a key generation system derived from the channel response of individual subcarrier in orthogonal frequency-division multiplexing (Ofdm) systems. Practical aspects of the security were investigated by implementing our key generation scheme on a wireless open-access research platform (WARP), which enables us to obtain channel estimation of individual Ofdm Subcarriers, a feature not currently available in most commercial wireless interface cards. Channel response of individual Ofdm subcarrier is usually a wide sense stationary random process, which allows us to find the optimal probing period and maximize the key generation rate. The implementation requires cross layer design as it involves interaction between physical and MAC layer. We have experimentally verified the feasibility and principles of key generation, and also evaluated the performance of our system in terms of randomness, key generation rate and key disagreement rate, which proves that Ofdm subcarrier's channel responses are valid for key generation.
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ICASSP - An effective key generation system using improved channel reciprocity
2015 IEEE International Conference on Acoustics Speech and Signal Processing (ICASSP), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:In physical layer security systems there is a clear need to exploit the radio link characteristics to automatically generate an encryption key between two end points. The success of the key generation depends on the channel reciprocity, which is impacted by the non-simultaneous measurements and the white nature of the noise. In this paper, an Ofdm Subcarriers' channel responses based key generation system with enhanced channel reciprocity is proposed. By theoretically modelling the Ofdm Subcarriers' channel responses, the channel reciprocity is modelled and analyzed. A low pass filter is accordingly designed to improve the channel reciprocity by suppressing the noise. This feature is essential in low SNR environments in order to reduce the risk of the failure of the information reconciliation phase during key generation. The simulation results show that the low pass filter improves the channel reciprocity, decreases the key disagreement, and effectively increases the success of the key generation.
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An effective key generation system using improved channel reciprocity
2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:In physical layer security systems there is a clear need to exploit the radio link characteristics to automatically generate an encryption key between two end points. The success of the key generation depends on the channel reciprocity, which is impacted by the non-simultaneous measurements and the white nature of the noise. In this paper, an Ofdm Subcarriers' channel responses based key generation system with enhanced channel reciprocity is proposed. By theoretically modelling the Ofdm Subcarriers' channel responses, the channel reciprocity is modelled and analyzed. A low pass filter is accordingly designed to improve the channel reciprocity by suppressing the noise. This feature is essential in low SNR environments in order to reduce the risk of the failure of the information reconciliation phase during key generation. The simulation results show that the low pass filter improves the channel reciprocity, decreases the key disagreement, and effectively increases the success of the key generation.
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Verification of Key Generation from Individual Ofdm Subcarrier's Channel Response
2015 IEEE Globecom Workshops (GC Wkshps), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:This paper presents a key generation system derived from the channel response of individual subcarrier in orthogonal frequency-division multiplexing (Ofdm) systems. Practical aspects of the security were investigated by implementing our key generation scheme on a wireless open-access research platform (WARP), which enables us to obtain channel estimation of individual Ofdm Subcarriers, a feature not currently available in most commercial wireless interface cards. Channel response of individual Ofdm subcarrier is usually a wide sense stationary random process, which allows us to find the optimal probing period and maximize the key generation rate. The implementation requires cross layer design as it involves interaction between physical and MAC layer. We have experimentally verified the feasibility and principles of key generation, and also evaluated the performance of our system in terms of randomness, key generation rate and key disagreement rate, which proves that Ofdm subcarrier's channel responses are valid for key generation.
Alan Marshall - One of the best experts on this subject based on the ideXlab platform.
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Efficient Key Generation by Exploiting Randomness From Channel Responses of Individual Ofdm Subcarriers
IEEE Transactions on Communications, 2016Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:Key generation from the randomness of wireless channels is a promising technique to establish a secret cryptographic key securely between legitimate users. This paper proposes a new approach to extract keys efficiently from the channel responses of individual orthogonal frequency-division multiplexing (Ofdm) Subcarriers. The efficiency is achieved by: 1) fully exploiting randomness from time and frequency domains and 2) improving the cross-correlation of the channel measurements. Through the theoretical modeling of the time and frequency autocorrelation relationship of the Ofdm subcarrier’s channel responses, we can obtain the optimal probing rate and use multiple uncorrelated Subcarriers as random sources. We also study the effects of non-simultaneous measurements and noise on the cross-correlation of the channel measurements. We find that the cross-correlation is mainly impacted by noise effects in a slow fading channel and use a low-pass filter to reduce the key disagreement rate and extend the system’s working signal-to-noise ratio range. The system is evaluated in terms of randomness, key generation rate, and key disagreement rate, verifying that it is feasible to extract randomness from both time and frequency domains of the Ofdm subcarrier’s channel responses.
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GLOBECOM Workshops - Verification of Key Generation from Individual Ofdm Subcarrier's Channel Response
2015 IEEE Globecom Workshops (GC Wkshps), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:This paper presents a key generation system derived from the channel response of individual subcarrier in orthogonal frequency-division multiplexing (Ofdm) systems. Practical aspects of the security were investigated by implementing our key generation scheme on a wireless open-access research platform (WARP), which enables us to obtain channel estimation of individual Ofdm Subcarriers, a feature not currently available in most commercial wireless interface cards. Channel response of individual Ofdm subcarrier is usually a wide sense stationary random process, which allows us to find the optimal probing period and maximize the key generation rate. The implementation requires cross layer design as it involves interaction between physical and MAC layer. We have experimentally verified the feasibility and principles of key generation, and also evaluated the performance of our system in terms of randomness, key generation rate and key disagreement rate, which proves that Ofdm subcarrier's channel responses are valid for key generation.
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ICASSP - An effective key generation system using improved channel reciprocity
2015 IEEE International Conference on Acoustics Speech and Signal Processing (ICASSP), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:In physical layer security systems there is a clear need to exploit the radio link characteristics to automatically generate an encryption key between two end points. The success of the key generation depends on the channel reciprocity, which is impacted by the non-simultaneous measurements and the white nature of the noise. In this paper, an Ofdm Subcarriers' channel responses based key generation system with enhanced channel reciprocity is proposed. By theoretically modelling the Ofdm Subcarriers' channel responses, the channel reciprocity is modelled and analyzed. A low pass filter is accordingly designed to improve the channel reciprocity by suppressing the noise. This feature is essential in low SNR environments in order to reduce the risk of the failure of the information reconciliation phase during key generation. The simulation results show that the low pass filter improves the channel reciprocity, decreases the key disagreement, and effectively increases the success of the key generation.
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An effective key generation system using improved channel reciprocity
2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:In physical layer security systems there is a clear need to exploit the radio link characteristics to automatically generate an encryption key between two end points. The success of the key generation depends on the channel reciprocity, which is impacted by the non-simultaneous measurements and the white nature of the noise. In this paper, an Ofdm Subcarriers' channel responses based key generation system with enhanced channel reciprocity is proposed. By theoretically modelling the Ofdm Subcarriers' channel responses, the channel reciprocity is modelled and analyzed. A low pass filter is accordingly designed to improve the channel reciprocity by suppressing the noise. This feature is essential in low SNR environments in order to reduce the risk of the failure of the information reconciliation phase during key generation. The simulation results show that the low pass filter improves the channel reciprocity, decreases the key disagreement, and effectively increases the success of the key generation.
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Verification of Key Generation from Individual Ofdm Subcarrier's Channel Response
2015 IEEE Globecom Workshops (GC Wkshps), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:This paper presents a key generation system derived from the channel response of individual subcarrier in orthogonal frequency-division multiplexing (Ofdm) systems. Practical aspects of the security were investigated by implementing our key generation scheme on a wireless open-access research platform (WARP), which enables us to obtain channel estimation of individual Ofdm Subcarriers, a feature not currently available in most commercial wireless interface cards. Channel response of individual Ofdm subcarrier is usually a wide sense stationary random process, which allows us to find the optimal probing period and maximize the key generation rate. The implementation requires cross layer design as it involves interaction between physical and MAC layer. We have experimentally verified the feasibility and principles of key generation, and also evaluated the performance of our system in terms of randomness, key generation rate and key disagreement rate, which proves that Ofdm subcarrier's channel responses are valid for key generation.
Roger Woods - One of the best experts on this subject based on the ideXlab platform.
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Efficient Key Generation by Exploiting Randomness From Channel Responses of Individual Ofdm Subcarriers
IEEE Transactions on Communications, 2016Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:Key generation from the randomness of wireless channels is a promising technique to establish a secret cryptographic key securely between legitimate users. This paper proposes a new approach to extract keys efficiently from the channel responses of individual orthogonal frequency-division multiplexing (Ofdm) Subcarriers. The efficiency is achieved by: 1) fully exploiting randomness from time and frequency domains and 2) improving the cross-correlation of the channel measurements. Through the theoretical modeling of the time and frequency autocorrelation relationship of the Ofdm subcarrier’s channel responses, we can obtain the optimal probing rate and use multiple uncorrelated Subcarriers as random sources. We also study the effects of non-simultaneous measurements and noise on the cross-correlation of the channel measurements. We find that the cross-correlation is mainly impacted by noise effects in a slow fading channel and use a low-pass filter to reduce the key disagreement rate and extend the system’s working signal-to-noise ratio range. The system is evaluated in terms of randomness, key generation rate, and key disagreement rate, verifying that it is feasible to extract randomness from both time and frequency domains of the Ofdm subcarrier’s channel responses.
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GLOBECOM Workshops - Verification of Key Generation from Individual Ofdm Subcarrier's Channel Response
2015 IEEE Globecom Workshops (GC Wkshps), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:This paper presents a key generation system derived from the channel response of individual subcarrier in orthogonal frequency-division multiplexing (Ofdm) systems. Practical aspects of the security were investigated by implementing our key generation scheme on a wireless open-access research platform (WARP), which enables us to obtain channel estimation of individual Ofdm Subcarriers, a feature not currently available in most commercial wireless interface cards. Channel response of individual Ofdm subcarrier is usually a wide sense stationary random process, which allows us to find the optimal probing period and maximize the key generation rate. The implementation requires cross layer design as it involves interaction between physical and MAC layer. We have experimentally verified the feasibility and principles of key generation, and also evaluated the performance of our system in terms of randomness, key generation rate and key disagreement rate, which proves that Ofdm subcarrier's channel responses are valid for key generation.
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ICASSP - An effective key generation system using improved channel reciprocity
2015 IEEE International Conference on Acoustics Speech and Signal Processing (ICASSP), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:In physical layer security systems there is a clear need to exploit the radio link characteristics to automatically generate an encryption key between two end points. The success of the key generation depends on the channel reciprocity, which is impacted by the non-simultaneous measurements and the white nature of the noise. In this paper, an Ofdm Subcarriers' channel responses based key generation system with enhanced channel reciprocity is proposed. By theoretically modelling the Ofdm Subcarriers' channel responses, the channel reciprocity is modelled and analyzed. A low pass filter is accordingly designed to improve the channel reciprocity by suppressing the noise. This feature is essential in low SNR environments in order to reduce the risk of the failure of the information reconciliation phase during key generation. The simulation results show that the low pass filter improves the channel reciprocity, decreases the key disagreement, and effectively increases the success of the key generation.
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An effective key generation system using improved channel reciprocity
2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:In physical layer security systems there is a clear need to exploit the radio link characteristics to automatically generate an encryption key between two end points. The success of the key generation depends on the channel reciprocity, which is impacted by the non-simultaneous measurements and the white nature of the noise. In this paper, an Ofdm Subcarriers' channel responses based key generation system with enhanced channel reciprocity is proposed. By theoretically modelling the Ofdm Subcarriers' channel responses, the channel reciprocity is modelled and analyzed. A low pass filter is accordingly designed to improve the channel reciprocity by suppressing the noise. This feature is essential in low SNR environments in order to reduce the risk of the failure of the information reconciliation phase during key generation. The simulation results show that the low pass filter improves the channel reciprocity, decreases the key disagreement, and effectively increases the success of the key generation.
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Verification of Key Generation from Individual Ofdm Subcarrier's Channel Response
2015 IEEE Globecom Workshops (GC Wkshps), 2015Co-Authors: Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. DuongAbstract:This paper presents a key generation system derived from the channel response of individual subcarrier in orthogonal frequency-division multiplexing (Ofdm) systems. Practical aspects of the security were investigated by implementing our key generation scheme on a wireless open-access research platform (WARP), which enables us to obtain channel estimation of individual Ofdm Subcarriers, a feature not currently available in most commercial wireless interface cards. Channel response of individual Ofdm subcarrier is usually a wide sense stationary random process, which allows us to find the optimal probing period and maximize the key generation rate. The implementation requires cross layer design as it involves interaction between physical and MAC layer. We have experimentally verified the feasibility and principles of key generation, and also evaluated the performance of our system in terms of randomness, key generation rate and key disagreement rate, which proves that Ofdm subcarrier's channel responses are valid for key generation.
Danijela Cabric - One of the best experts on this subject based on the ideXlab platform.
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Compressive Identification of Active Ofdm Subcarriers in Presence of Timing Offset
2015 IEEE Global Communications Conference (GLOBECOM), 2015Co-Authors: Alireza Razavi, Mikko Valkama, Danijela CabricAbstract:In this paper we study the problem of identifying active Subcarriers in an Ofdm signal from compressive measurements sampled at sub-Nyquist rate. The problem is of importance in Cognitive Radio systems when secondary users (SUs) are looking for available spectrum opportunities to communicate over them while sensing at Nyquist rate sampling can be costly or even impractical in case of very wide bandwidth. We first study the effect of timing offset and derive the necessary and sufficient conditions for signal recovery in the oracle-assisted case when the true active sub-carriers are assumed known. Then we propose an Orthogonal Matching Pursuit (OMP)- based joint sparse recovery method for identifying active Subcarriers when the timing offset is known. Finally we extend the problem to the case of unknown timing offset and develop a joint dictionary learning and sparse approximation algorithm, where in the dictionary learning phase the timing offset is estimated and in the sparse approximation phase active Subcarriers are identified. The obtained results demonstrate that active subcarrier identification can be carried out reliably, by using the developed framework.
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GLOBECOM - Compressive Identification of Active Ofdm Subcarriers in Presence of Timing Offset
2015 IEEE Global Communications Conference (GLOBECOM), 2014Co-Authors: Alireza Razavi, Mikko Valkama, Danijela CabricAbstract:In this paper we study the problem of identifying active Subcarriers in an Ofdm signal from compressive measurements sampled at sub-Nyquist rate. The problem is of importance in Cognitive Radio systems when secondary users (SUs) are looking for available spectrum opportunities to communicate over them while sensing at Nyquist rate sampling can be costly or even impractical in case of very wide bandwidth. We first study the effect of timing offset and derive the necessary and sufficient conditions for signal recovery in the oracle-assisted case when the true active sub-carriers are assumed known. Then we propose an Orthogonal Matching Pursuit (OMP)- based joint sparse recovery method for identifying active Subcarriers when the timing offset is known. Finally we extend the problem to the case of unknown timing offset and develop a joint dictionary learning and sparse approximation algorithm, where in the dictionary learning phase the timing offset is estimated and in the sparse approximation phase active Subcarriers are identified. The obtained results demonstrate that active subcarrier identification can be carried out reliably, by using the developed framework.
