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We propose a physical layer approach to detect the relay node that injects false data or adds channel errors into the network encoder in multiple access relay networks. The misbehaving relay is detected by using the maximum a posteriori (MAP) detection rule which is optimal in the sense of minimizing the probability of incorrect decision (false alarm and miss detection). The proposed scheme does not...
Clearly, making use of user cooperation transmission technique in a multi-hop wireless network improves its performance in terms of transmission reliability and gives birth to multi-hop wireless relay networks. In this paper, we investigate and evaluate the Bit Error Rate (BER) of multi-hop wireless relay networks employing distributed Space-Time Block Coding (STBC) at many relays' levels. One relays'...
This paper investigates the diversity performance of wireless cooperative networks with multiple parallel relays communicating with the destination over orthogonal channels, and focuses on the amplify-and-forward relaying protocol. The networks under consideration employ two signal-to-noise ratio (SNR) thresholds and multiple hard-decision detections (HDDs) at the destination. One SNR threshold is...
A novel heterogeneous cooperative relay channel model is proposed in this article. It can integrate various wireless access systems into one entity and improve the spectrum efficiency remarkably. According to the characteristics of the heterogeneous and conventional homogeneous cooperative relay channel model, the outage probability performance is investigated over Nakagami-m fading model. A numerical...
A new optimization criterion is proposed to minimize error probability for the proposed joint optimal power allocation (PA) of the MIMO systems enhanced by relay in this paper. It is proved that the cost function obtained is only convex with respect to (w.r.t.) the power parameters of the source or those of the relay separately, but not convex w.r.t. the whole parameters. In order to use convex optimization...
In the existing literatures on cooperative relay system, the coding scheme adopts the conventional fixed-rate code (traditional code). This paper first studies the rateless code, Raptor code, to cooperative wireless cellular system. In particular, we study the efficiency, reliability, and robustness of cooperative communication in a wireless cellular downlink environment by employing a new scheme...
OFDMA is regarded as a promising solution for improving the performance of interactive wireless broadcasting systems. Recently, to enhance the performance of OFDMA systems, MIMO techniques have been investigated, and the OFDMA systems have been extended to MIMO architectures. Although transmit diversity is clearly advantageous on OFDMA uplink system in interactive broadcasting, it may not be possible...
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