Performance Analysis of Antenna Selection in Two-Way Relay Networks

Abstract

We investigate the performance of multi-antenna two-way relay networks, where both amplify-and-forward (AF) and decode-and-forward (DF) relaying strategies are considered. First an antenna selection scheme among all nodes is proposed based on maximizing the worse received signal-to-noise ratio (SNR) of two end users. Then, we derive the probability density function (PDF) and cumulative distribution function (CDF) of the received SNRs of both users. We also obtain the closedform expressions of average bit error rates (BER) and the outage probability of our system. Furthermore, we study the asymptotic behavior of our system when transmitting SNR or the number of antennas is large. The results show that the proposed antenna selection scheme achieves full diversity, and the simulation results closely match to our theoretical analysis. To further improve the spectrum efficiency of the system, a hybrid selection antenna scheme is proposed. Finally, the numerical results show that our scheme outperforms the state of art.Index Terms-Amplify-and-forward, antenna selection, bit error rate, decode-and-forward, outage probability.

On the Performance of Full-Duplex Two-Way Relay Channels With Spatial Modulation

“…For sake of fair comparisons, the transmission rule of FD-TWRC-OAS is identical with that of the proposed FD-TWRC-SM system. In [56], S i s transmit their respective signals to R in two time blocks successively, whereas in the considered FD-TWRC-OAS system in this subsection, both S i s transmit signals to R simultaneously in a single time block, as consistent with Fig. 2.…”

“…As discussed in [56] and the references therein, in TWR-C systems, the ABEP is dominated by the hop having a worse performance. Based on this idea, we give a framework for analyzing and evaluating the performance of TWRC-SM systems and propose an upper bound on the ABEP by dividing the summations in (9) into three cases and compute them separately.…”

“…As another category of MIMO systems with a single transmit RF chain, the optimal antenna selection (OAS) system has been widely investigated and introduced into TWRC transmission [56], [59]. In this section, we compare the performance of the proposed FD-TWRC-SM system with that of the FD-TWRC-OAS system.…”

“…In this section, we compare the performance of the proposed FD-TWRC-SM system with that of the FD-TWRC-OAS system. In the FD-TWRC-OAS system, optimal transmit antennas in term of the received signal strength of the intended signal are selected to transmit QAM signals in the first hop and the max-min antenna selection algorithm proposed in [56,Algorithm 1] is employed in the second hop. For sake of fair comparisons, the transmission rule of FD-TWRC-OAS is identical with that of the proposed FD-TWRC-SM system.…”

“…Without loss of generality, letting n 1 = n 2 = 1, (9) can be rewritten as (46). In the high SNR regime, the ABEP of the transmission is determined by the hop having a worse performance [56]. Therefore, two cases of error are considered, i.e., the errors that occur in the first and second hops.…”