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Alamouti Scheme

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Jinhong Yuan – One of the best experts on this subject based on the ideXlab platform.

  • AusCTW – Physical-layer network coding with Alamouti Scheme for the TWRC with linear decoder
    2014 Australian Communications Theory Workshop (AusCTW), 2014
    Co-Authors: Mengyu Huang, Jinhong Yuan

    Abstract:

    In this paper, we consider a Rayleigh faded two-way relay channel with two antennas at each user and a single antenna at the relay. Two users adopt the Alamouti Scheme to transmit BPSK modulated signals to the relay simultaneously. First, we develop eighteen types of physical-layer network codewords that can be applied in this system. To simplify the operation of the relay, we focus on two simplest types of physical-layer network codewords of the eighteen types. Then a linear decoder is proposed for the relay to detect the selected two types of network coded information of two users. We present the numerical result of the bit error probability of the proposed physical-layer network coding Scheme with the linear decoder and discuss the further improvements of the decoder.

  • physical layer network coding with Alamouti Scheme for the twrc with linear decoder
    Australian Communications Theory Workshop, 2014
    Co-Authors: Mengyu Huang, Jinhong Yuan

    Abstract:

    In this paper, we consider a Rayleigh faded two-way relay channel with two antennas at each user and a single antenna at the relay. Two users adopt the Alamouti Scheme to transmit BPSK modulated signals to the relay simultaneously. First, we develop eighteen types of physical-layer network codewords that can be applied in this system. To simplify the operation of the relay, we focus on two simplest types of physical-layer network codewords of the eighteen types. Then a linear decoder is proposed for the relay to detect the selected two types of network coded information of two users. We present the numerical result of the bit error probability of the proposed physical-layer network coding Scheme with the linear decoder and discuss the further improvements of the decoder.

  • transmit antenna selection with Alamouti Scheme in mimo wiretap channels
    Global Communications Conference, 2013
    Co-Authors: Shihao Yan, Nan Yang, Robert Malaney, Jinhong Yuan

    Abstract:

    This paper proposes a new transmit antenna selection (TAS) Scheme which provides enhanced physical layer security in multiple-input multiple-output (MIMO) wiretap channels. The practical passive eavesdropping scenario we consider is where channel state information (CSI) from the eavesdropper is not available at the transmitter. Our new Scheme is carried out in two steps. First, the transmitter selects the two strongest antennas based on the feedback from the receiver, which maximizes the instantaneous signal-to-noise ratio (SNR) of the transmitter-receiver channel. Second, the Alamouti Scheme is employed at the selected antennas in order to perform data transmission. At the receiver and the eavesdropper, maximal-ratio combining is applied in order to exploit the multiple antennas. We derive a new closed-form expression for the secrecy outage probability in non-identical Rayleigh fading, and using this result, we then present the probability of non-zero secrecy capacity in closed form and the e-outage secrecy capacity in numerical form. We demonstrate that our proposed TAS-Alamouti Scheme offers lower secrecy outage probability than a single TAS Scheme when the SNR of the transmitter-receiver channel is above a specific value.

Florian Dupuy – One of the best experts on this subject based on the ideXlab platform.

  • Widely linear Alamouti receivers for the reception of real-valued signals corrupted by interferences – the Alamouti-SAIC/MAIC concept
    IEEE Transactions on Signal Processing, 2011
    Co-Authors: P. Chevalier, Florian Dupuy

    Abstract:

    Orthogonal space-time block codes (STBC), and the Alamouti Scheme in particular, are of particular interest in multiple-input multiple-output (MIMO) systems since they achieve full spatial diversity over fading channels and are decoded from linear processing at the receiver. Nevertheless, due to the expensive spectral resource, increasing network capacity requires the development of interference cancellation (IC) techniques allowing several users to share the same spectral resources without impacting the transmission quality. In this context several IC Schemes have been developed during this last decade, where each user is equipped with multiple antennas and employs STBC at transmission. However, these IC techniques require multiple antennas at reception, which remains a challenge at the handset level due to cost and size limitations. For this reason, low complexity single antenna interference cancellation (SAIC) techniques, currently operational in GSM handsets, have been developed recently for single antenna users using real-valued modulations or complex filtering of real-valued modulations, by using a widely linear (WL) filtering at reception. Extension to multiple antennas at reception is called multiple antenna interference cancellation (MAIC) technique. The purpose of this paper is to extend the SAIC/MAIC technology to users using both real-valued constellations, such as amplitude shift keying (ASK) constellations, and the Alamouti Scheme at transmission. A WL minimum mean square error (MMSE) receiver, completely new for IC purposes in the context of radio communications systems using the Alamouti Scheme, is proposed and analyzed. This receiver, which corresponds to the maximum likelihood (ML) receiver for synchronous intranetwork interferences, is able to separate up to 2 N Alamouti users from N antennas at reception, hence SAIC capability for N = 1.

  • Widely Linear Alamouti Receiver for the Reception of Real-Valued Constellations Corrupted by Interferences—The Alamouti-SAIC/MAIC Concept
    IEEE Transactions on Signal Processing, 2011
    Co-Authors: P. Chevalier, Florian Dupuy

    Abstract:

    Orthogonal space-time block codes (STBC), and the Alamouti Scheme in particular, are of particular interest in multiple-input multiple-output (MIMO) systems since they achieve full spatial diversity over fading channels and are decoded from linear processing at the receiver. Nevertheless, due to the expensive spectral resource, increasing network capacity requires the development of interference cancellation (IC) techniques allowing several users to share the same spectral resources without impacting the transmission quality. In this context several IC Schemes have been developed during this last decade, where each user is equipped with multiple antennas and employs STBC at transmission. However, these IC techniques require multiple antennas at reception, which remains a challenge at the handset level due to cost and size limitations. For this reason, low complexity single antenna interference cancellation (SAIC) techniques, currently operational in GSM handsets, have been developed recently for single antenna users using real-valued modulations or complex filtering of real-valued modulations, by using a widely linear (WL) filtering at reception. Extension to multiple antennas at reception is called multiple antenna interference cancellation (MAIC) technique. The purpose of this paper is to extend the SAIC/MAIC technology to users using both real-valued constellations, such as amplitude shift keying (ASK) constellations, and the Alamouti Scheme at transmission. A WL minimum mean square error (MMSE) receiver, completely new for IC purposes in the context of radio communications systems using the Alamouti Scheme, is proposed and analyzed. This receiver, which corresponds to the maximum likelihood (ML) receiver for synchronous intranetwork interferences, is able to separate up to 2 N Alamouti users from N antennas at reception, hence SAIC capability for N = 1.

Hoaian Tran – One of the best experts on this subject based on the ideXlab platform.

  • On The Symbol Error Probability of Distributed-Alamouti Scheme
    Journal of Communications, 2009
    Co-Authors: Trung Q Duong, Hoaian Tran, Ahsan Haroon

    Abstract:

    Taking into account the relay’s location, we analyze the maximum likelihood (ML) decoding performance of dualhop relay network, in which two amplify-and-forward (AF) relays employ the Alamouti code in a distributed fashion. In particular, using the well-known moment generating function (MGF) approach we derive the closed-form expressions of the average symbol error probability (SEP) for M-ary phase-shift keying (M-PSK) when the relays are located nearby either the source or destination. The analytical result is obtained as a single integral with finite limits and the integrand composed solely of trigonometric functions. Assessing the asymptotic characteristic of SEP formulas in the high signal-to-noise ratio regime, we show that the distributed-Alamouti protocol achieves a full diversity order. We also perform the Monte-Carlo simulations to validate our analysis. In addition, based on the upper bound of SEP we propose an optimal power allocation between the first-hop (the source-to-relay link) and second-hop (the relay-to-destination link) transmission. We further show that as the two relays are located nearby the destination most of the total power should be allocated to the broadcasting phase (the first-hop transmission). When the two relays are placed close to the source, we propose an optimal transmission Scheme which is a non-realtime processing, hence, can be applied for practical applications. It is shown that the optimal power allocation Scheme outperforms the equal power Scheme with a SEP performance improvement by 2-3 dB.

  • symbol error probability of distributed Alamouti Scheme in wireless relay networks
    Vehicular Technology Conference, 2008
    Co-Authors: Trung Q Duong, Hoaian Tran

    Abstract:

    In this paper, we analyze the maximum likelihood decoding performance of non-regenerative cooperation employing Alamouti Scheme. Specifically, we derive two closed-form expressions for average symbol error probability (SEP) when the relays are located near by the source or destination. The analytical results are obtained as a single integral with finite limits and an integrand composed solely of trigonometric functions. Assessing the asymptotic (high signal-to-noise ratio) behavior of SEP formulas, we show that the distributed-Alamouti codes achieves a full diversity order. We also perform Monte-Carlo simulations to validate the analysis.

  • VTC Spring – Symbol Error Probability of Distributed-Alamouti Scheme in Wireless Relay Networks
    VTC Spring 2008 – IEEE Vehicular Technology Conference, 2008
    Co-Authors: Trung Q Duong, Hoaian Tran

    Abstract:

    In this paper, we analyze the maximum likelihood decoding performance of non-regenerative cooperation employing Alamouti Scheme. Specifically, we derive two closed-form expressions for average symbol error probability (SEP) when the relays are located near by the source or destination. The analytical results are obtained as a single integral with finite limits and an integrand composed solely of trigonometric functions. Assessing the asymptotic (high signal-to-noise ratio) behavior of SEP formulas, we show that the distributed-Alamouti codes achieves a full diversity order. We also perform Monte-Carlo simulations to validate the analysis.