Performance analysis of bi-directional relay selection strategy for wireless cooperative communications

Abstract

This paper proposes a new two-way double-relay selection strategy for wireless cooperative communication systems with its bit error rate (BER) performance analysis. In this work, two relays are first chosen to maximize the overall system performance in terms of BER. Then, either the two-phase or three-phase protocol is performed to achieve two-directional communications between the communicating terminals through the selected relay nodes that apply orthogonal space-time coding (STC) scheme in a distributed fashion to improve the overall system performance with linear decoding complexity. In other words, the proposed strategy offers an improvement in the reliability of the system and enjoys very low decoding complexity by enabling a symbol-wise decoder. On the other hand, another improvement in the performance at the communication terminals is achieved by performing a network coding method at the selected relay nodes. Furthermore, we offer also analytical approximation of the BER performance for the proposed strategy where the simulation results match perfectly the analytical ones. From the simulation results section, the proposed strategy shows a substantially improved BER performance as compared to the current ones.

Distributed differential beamforming and power allocation for cooperative communication networks

“…It can be noted here that in (10) and (11), the two phase terms − (∡ 1 ( − 1) + ∡ 2 ( − 1)) and − (∡ 1 ( − 1) + ∡ 2 ( − 1)) are constants. Then, the signals received at the terminals 1 2 in the third and fourth time slot of the ℎ transmission block, are given by:…”

“…Differential modulation has recently received considerable interest as it offers diversity and coding gain without the need for channel estimation [1][2][3][4][5][6][7][8]. Relaying techniques for wireless communication systems have been studied extensively in the last decade [9][10][11][12][13][14][15][16]. They have proposed many promising features such as high data rates, and better capacity.…”

“…Communications over channels with fading nature may demand channel state information (CSI) at the transmitter, at the relay node or at the receiver according to the used technology [9][10][11][12]. Some techniques such as distributed beamforming assumes a perfect CSI at all nodes, which is considered unrealistic [17,18].…”

Impact of engineering parameters on performance of relay-assisted network

“…Many studies have investigated the performance of the relaying technique either with a theoretical approach [2], or with system-level simulations [3] or with field measurements [4]. Moreover, many recent multiple antenna techniques have been proposed to improve the overall system performance in terms of bit error rate, the achievable data rate [5][6][7][8][9][10][11][12] and system complexity [13][14][15] such as space time coding techniques [5][6], beamforming techniques [7][8][9], time reversal technique [12], relay selection techniques [16][17][18][19][20][21][22][23][24][25][26][27][28], and differential techniques [6][7][8][9]. However, there are still lacks on understanding the impact of the propagation conditions on the performance of the relaying technique.…”

Efficient time reversal strategy for MISO-OFDM systems

“…In the other hand, the systems complexity increases. The most competing thing is to enhance these systems in order to increase their performances and to make reliable communications, but also to decrease their complexity and their costs [10][11][12][13][14][15]. As it is known, communications in channel fading nature may demand channel estimation at the transmitter or at the receiver according to the used technology.…”