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In this paper, we study the performance of the channel estimation in a Turbo coded, orthogonal frequency division multiplexing (OFDM) with multiple antennas at the receiver. We survey the accuracy of the channel estimation for different number of users and different number of pilot subcarriers. Moreover, since there is not a closed form solution to the BER of the Turbo coded system for different number...
In this paper, we propose a low rate bandwidth efficient channel coding scheme for MC-CDMA system so that by using it, the coded system without any extra bandwidth, significantly improves the performance of an un-coded system over fading channels. Moreover, we investigate the performance of multiple antennas array aided coded MC-CDMA system by employing different smart antennas techniques at the receiver...
In this paper, we analyze the performance of a special kind of multitone CDMA (MT-CDMA) systems that is S/P-Replica MT-CDMA. It is shown that with the same bandwidth, S/P-Replica MT-CDMA system outperforms the conventional system that we name it as S/P MT-CDMA. We also propose a low rate bandwidth efficient channel coding scheme for S/P-Replica MT-CDMA communication system so that by using it, the...
Media access control (MAC) protocol design is a challenging problem in wireless ad hoc networks. Network resource management like battery life and bandwidth are two design factors in these networks. Some power control MAC protocols try to increase throughput or decrease energy consumption or both of them. We propose a power control scheme based on number of neighbor in mobile ad hoc network and consider...
Inspired by the requirement of proper link simulation methods in performance analysis of communication systems, we present in this paper a recipe for channel implementation in simulation environments. Our focus here is the indoor applications of wireless local-area networks (WLANs). Specifically, we describe a procedure that beginning with statistical description of the channel impulse response leads...
Considering the space division multiple access (SDMA) in IEEE 802.11a based systems, in this paper, we propose a new two-step multiuser detection (MUD) algorithms. In the first step, MMSE and MSNIR MUD algorithms are used. In the second step, by using sensitive bits algorithm (SBA) to obtain least reliable bits, maximum likelihood detection (MLD) algorithm is applied only to these bits; as a consequence,...
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