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.
Highlights
In wireless communication systems, a major challenge is to overcome the effect of small-scale fading cased by Doppler spread and multi-path propagation
Alabed EURASIP Journal on Wireless Communications and Networking (2019) 2019:97 at both the transmitting and the receiving antennas such as the non-coherent strategies and differential strategies, e.g., differential chaos shift keying (DCSK), [2,3,4,5,6, 14,15,16,17,18,19,20,21]. The latter strategies overcome the overhead involved with channel estimation, they suffer from low bit error rate (BER) performance, low spectral efficiency, and a comparably high latency and decoding complexity for more than two transmit antennas due to unavailable channel state information (CSI) at any node
When modular arithmetic (MA) function is performed on the relay nodes, k R,T2 can be expressed as SR(k R,T2 ) = sR,T2 ; the second terminal T2 decodes the information signals of the first terminal T1 by using sT1 = Fm−1(sR,T2, sT2 ) = ST1 (mod(k R,T2 − kT2, |ST1 |)) where Fm−1 stands for the inverse of the MA function
Summary
A major challenge is to overcome the effect of small-scale fading cased by Doppler spread and multi-path propagation. Alabed EURASIP Journal on Wireless Communications and Networking (2019) 2019:97 at both the transmitting and the receiving antennas such as the non-coherent strategies and differential strategies, e.g., differential chaos shift keying (DCSK), [2,3,4,5,6, 14,15,16,17,18,19,20,21] The latter strategies overcome the overhead involved with channel estimation, they suffer from low BER performance, low spectral efficiency, and a comparably high latency and decoding complexity for more than two transmit antennas due to unavailable CSI at any node. In the normal wireless communication strategies, relay nodes can forward the received information symbol vectors on orthogonal channels or process the received signal vectors using orthogonal strategies, e.g., orthogonal STC strategy [13], before broadcasting them to enjoy the highest coding and diversity gain without increasing the decoding complexity. The proposed strategy shows a substantially improved BER performance as compared to the current ones
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