The Experts below are selected from a list of 3630 Experts worldwide ranked by ideXlab platform
T A Gulliver - One of the best experts on this subject based on the ideXlab platform.
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pulse position amplitude modulation for time hopping multiple access uwb communications
IEEE Transactions on Communications, 2005Co-Authors: Hao Zhang, T A GulliverAbstract:In this letter, we propose a new modulation scheme called pulse position amplitude modulation (PPAM) for ultra-wideband (UWB) communication systems. PPAM combines pulse position modulation and pulse amplitude modulation to provide good system performance and low computational complexity. The channel capacity of PPAM is determined for a time-hopping multiple-access UWB communication system. The error probability and performance bounds are derived for a Multiuser Environment.
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pulse position amplitude modulation for time hopping multiple access uwb communications
Wireless Communications and Networking Conference, 2004Co-Authors: Hao Zhang, T A GulliverAbstract:In this paper, we propose a new modulation scheme called pulse amplitude position modulation (PPAM) for ultra-wideband (UWB) communication systems. PPAM combines pulse position modulation (PPM) and pulse amplitude modulation (PAM) to provide good system performance and low computational complexity. A set of MN-ary, M=2/sup k/, N=2/sup N/. PPAM signals are constructed from N-ary orthogonal PPM signals by including M-ary PAM signals in each dimension. It is shown that MN-ary PPAM has better performance than MN-ary PAM and less complexity than MN-ary PPM for MN>2. The channel capacity of PPAM is determined for a time-hopping multiple access UWB communication system. The error probability and performance bounds are derived for a Multiuser Environment. In particular, it is shown that for M=2. 2N-ary PPAM signals have better performance than 2N-ary PPM with the same throughput and half the computational complexity.
Hao Zhang - One of the best experts on this subject based on the ideXlab platform.
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pulse position amplitude modulation for time hopping multiple access uwb communications
IEEE Transactions on Communications, 2005Co-Authors: Hao Zhang, T A GulliverAbstract:In this letter, we propose a new modulation scheme called pulse position amplitude modulation (PPAM) for ultra-wideband (UWB) communication systems. PPAM combines pulse position modulation and pulse amplitude modulation to provide good system performance and low computational complexity. The channel capacity of PPAM is determined for a time-hopping multiple-access UWB communication system. The error probability and performance bounds are derived for a Multiuser Environment.
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performance and capacity of pam and ppm uwb time hopping multiple access communications with receive diversity
EURASIP Journal on Advances in Signal Processing, 2005Co-Authors: Hao Zhang, Aaron T GulliverAbstract:The error probability and capacity of a time-hopping ultra-wideband (UWB) communication system with receive diversity are investigated.We consider pulse amplitudemodulation (PAM) and pulse-positionmodulation (PPM) over additive white Gaussian channels for a single-user system. A Multiuser Environment with PPM is also investigated. It is shown that the communication distance and error performance are improved by employing receive diversity. The channel capacity of PPM and PAMis determined subject to the power constraints of FCC part 15 rules to illustrate the relationship between reliable communication distance and signal-to-noise ratio. The error probability with PAMand receive diversity is derived for the single-user case. The error probability and performance bounds with PPM are derived for both the single-user and Multiuser cases.
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pulse position amplitude modulation for time hopping multiple access uwb communications
Wireless Communications and Networking Conference, 2004Co-Authors: Hao Zhang, T A GulliverAbstract:In this paper, we propose a new modulation scheme called pulse amplitude position modulation (PPAM) for ultra-wideband (UWB) communication systems. PPAM combines pulse position modulation (PPM) and pulse amplitude modulation (PAM) to provide good system performance and low computational complexity. A set of MN-ary, M=2/sup k/, N=2/sup N/. PPAM signals are constructed from N-ary orthogonal PPM signals by including M-ary PAM signals in each dimension. It is shown that MN-ary PPAM has better performance than MN-ary PAM and less complexity than MN-ary PPM for MN>2. The channel capacity of PPAM is determined for a time-hopping multiple access UWB communication system. The error probability and performance bounds are derived for a Multiuser Environment. In particular, it is shown that for M=2. 2N-ary PPAM signals have better performance than 2N-ary PPM with the same throughput and half the computational complexity.
Shlomi Arnon - One of the best experts on this subject based on the ideXlab platform.
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Multiuser diffuse indoor wireless infrared communication using equalized
2006Co-Authors: Uri N Griner, Shlomi ArnonAbstract:We propose an indoor wireless infrared downlink scheme for high-data-rate Multiuser connectivity with diffuse channels. The scheme is based on synchronous code-division multiple access with unipolar Hadamard codes. The orthogonality of unipolar Hadamard codes enables Multiuser operation with relatively short codes. Thus, practical downlink rates of tens of Mb/s for each user can be obtained. However, multipath reflec- tions in diffuse channels cause strong multipath dispersion and, consequently, severe distortion. This distortion becomes even more severe in a Multiuser Environment, as the dispersed incoherent infrared radiation of all users aggregates together. To mitigate this distortion, we use a novel adaptive multilevel serial composite decision feedback and feedforward equalizer. We investigate the system's performance with the proposed equalizer, and compare it with the performance of the same system, both composite decision-feedback and feedforward equalizers, and with a conven- tional decision-feedback equalizer (DFE). Our results show that the proposed scheme enables a high-data-rate multiaccess link and eliminates most of the Multiuser distortion. Furthermore, it improves system performance in a multiaccess Environment, as compared with the other composite equalizers and DFE for the same complexity. We also compare other coding schemes, and show that Hadamard codes are on top of the other codes. Index Terms—Decision-feedback equalizer (DFE), decision feed- forward equalizer, indoor wireless communication, infrared (IR) communication, multiaccess communication, optical code-division multiple access (OCDMA).
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Multiuser diffuse indoor wireless infrared communication using equalized synchronous CDMA
IEEE Transactions on Communications, 2006Co-Authors: Uri N Griner, Shlomi ArnonAbstract:We propose an indoor wireless infrared downlink scheme for high-data-rate Multiuser connectivity with diffuse channels. The scheme is based on synchronous code-division multiple access with unipolar Hadamard codes. The orthogonality of unipolar Hadamard codes enables Multiuser operation with relatively short codes. Thus, practical downlink rates of tens of Mb/s for each user can be obtained. However, multipath reflections in diffuse channels cause strong multipath dispersion and, consequently, severe distortion. This distortion becomes even more severe in a Multiuser Environment, as the dispersed incoherent infrared radiation of all users aggregates together. To mitigate this distortion, we use a novel adaptive multilevel serial composite decision feedback and feedforward equalizer. We investigate the system's performance with the proposed equalizer, and compare it with the performance of the same system, both composite decision-feedback and feedforward equalizers, and with a conventional decision-feedback equalizer (DFE). Our results show that the proposed scheme enables a high-data-rate multiaccess link and eliminates most of the Multiuser distortion. Furthermore, it improves system performance in a multiaccess Environment, as compared with the other composite equalizers and DFE for the same complexity. We also compare other coding schemes, and show that Hadamard codes are on top of the other codes
Li Ping - One of the best experts on this subject based on the ideXlab platform.
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compressed coding amp based decoding and analog spatial coupling
IEEE Transactions on Communications, 2020Co-Authors: Shansuo Liang, Chulong Liang, Li PingAbstract:This paper considers a compressed-coding scheme that combines compressed sensing with forward error control coding. Approximate message passing (AMP) is used to decode the message. Based on the state evolution analysis of AMP, we derive the performance limit of compressed-coding. We show that compressed-coding can approach Gaussian capacity at a very low compression ratio. Further, the results are extended to systems involving non-linear effects such as clipping. We show that the capacity approaching property can still be maintained when generalized AMP is used to decode the message. To approach the capacity, a low-rate underlying code should be designed according to the curve matching principle, which is complicated in practice. Instead, analog spatial-coupling is used to avoid sophisticated low-rate code design. In the end, we study the coupled scheme in a Multiuser Environment, where analog spatial-coupling can be realized in a distributive way. The overall block length can be shared by many users, which reduces block length per-user.
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Compressed Coding, AMP Based Decoding and Analog Spatial Coupling
2020Co-Authors: Liang Shansuo, Liang Chulong, Ma Junjie, Li PingAbstract:This paper considers a compressed-coding scheme that combines compressed sensing with forward error control coding. Approximate message passing (AMP) is used to decode the message. Based on the state evolution analysis of AMP, we derive the performance limit of compressed-coding. We show that compressed-coding can approach Gaussian capacity at a very low compression ratio. Further, the results are extended to systems involving non-linear effects such as clipping. We show that the capacity approaching property can still be maintained when generalized AMP is used to decode the message. To approach the capacity, a low-rate underlying code should be designed according to the curve matching principle, which is complicated in practice. Instead, analog spatial-coupling is used to avoid sophisticated low-rate code design. In the end, we study the coupled scheme in a Multiuser Environment, where spatial-coupling can be realized in a distributive way. The overall block length can be shared by many users, which reduces block length per-user.Comment: This work has been submitted to the IEEE for possible publication. Copyright may be transferred without notice, after which this version may no longer be accessibl
Uri N Griner - One of the best experts on this subject based on the ideXlab platform.
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Multiuser diffuse indoor wireless infrared communication using equalized
2006Co-Authors: Uri N Griner, Shlomi ArnonAbstract:We propose an indoor wireless infrared downlink scheme for high-data-rate Multiuser connectivity with diffuse channels. The scheme is based on synchronous code-division multiple access with unipolar Hadamard codes. The orthogonality of unipolar Hadamard codes enables Multiuser operation with relatively short codes. Thus, practical downlink rates of tens of Mb/s for each user can be obtained. However, multipath reflec- tions in diffuse channels cause strong multipath dispersion and, consequently, severe distortion. This distortion becomes even more severe in a Multiuser Environment, as the dispersed incoherent infrared radiation of all users aggregates together. To mitigate this distortion, we use a novel adaptive multilevel serial composite decision feedback and feedforward equalizer. We investigate the system's performance with the proposed equalizer, and compare it with the performance of the same system, both composite decision-feedback and feedforward equalizers, and with a conven- tional decision-feedback equalizer (DFE). Our results show that the proposed scheme enables a high-data-rate multiaccess link and eliminates most of the Multiuser distortion. Furthermore, it improves system performance in a multiaccess Environment, as compared with the other composite equalizers and DFE for the same complexity. We also compare other coding schemes, and show that Hadamard codes are on top of the other codes. Index Terms—Decision-feedback equalizer (DFE), decision feed- forward equalizer, indoor wireless communication, infrared (IR) communication, multiaccess communication, optical code-division multiple access (OCDMA).
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Multiuser diffuse indoor wireless infrared communication using equalized synchronous CDMA
IEEE Transactions on Communications, 2006Co-Authors: Uri N Griner, Shlomi ArnonAbstract:We propose an indoor wireless infrared downlink scheme for high-data-rate Multiuser connectivity with diffuse channels. The scheme is based on synchronous code-division multiple access with unipolar Hadamard codes. The orthogonality of unipolar Hadamard codes enables Multiuser operation with relatively short codes. Thus, practical downlink rates of tens of Mb/s for each user can be obtained. However, multipath reflections in diffuse channels cause strong multipath dispersion and, consequently, severe distortion. This distortion becomes even more severe in a Multiuser Environment, as the dispersed incoherent infrared radiation of all users aggregates together. To mitigate this distortion, we use a novel adaptive multilevel serial composite decision feedback and feedforward equalizer. We investigate the system's performance with the proposed equalizer, and compare it with the performance of the same system, both composite decision-feedback and feedforward equalizers, and with a conventional decision-feedback equalizer (DFE). Our results show that the proposed scheme enables a high-data-rate multiaccess link and eliminates most of the Multiuser distortion. Furthermore, it improves system performance in a multiaccess Environment, as compared with the other composite equalizers and DFE for the same complexity. We also compare other coding schemes, and show that Hadamard codes are on top of the other codes
