Performance of Dual-Hop Multi-Antenna Systems with Fixed Gain Amplify-and-Forward Relay Selection

Abstract

Abstract-The performance of amplify-and-forward relaying in Rayleigh channels is explored for a dual-hop transmission system in which a transmission source selects one of several relays based upon instantaneous SNR (signal to noise ratio) to transmit a data packet to a destination receiver. Both source and receiver devices have multiple antennas, employing beamforming for transmission and MRC (maximal ratio combining) for reception. The chosen relay performs fixed gain forwarding. Closed form solutions for several performance measures are derived for this practical system, and the system is studied in terms of outage probability and symbol error rate which are verified through simulation. Several implementation alternatives are explored to note performance trade-offs, particularly between number of antennas and number of relays.Index Terms-Cooperative diversity, relay selection, amplifyand -forward, beamforming, symbol error rate, outage probability.

Study of Relay Selection in a Multi-Cell Cognitive Network

“…This is clearly verified in Fig. 2, where in all cases curves based on the exact expression (13), approximate expression (14) and numerical simulations are very well matched. It is also shown in Fig.…”

“…To be specific, we let ϕ 1 = ϕ 2 = 20 or 30, corresponding to large L 1 and L 2 defined in (9). As was mentioned above, for large L 1 and L 2 , the exact CDF of the SINR (13) can be approximated as (14). This is clearly verified in Fig.…”

“…Note that similar assumption is also applied in many existing approaches including those in [12], [13] and [14].…”

“…In the simulations below, the noise variances σ (13) and those based on the approximation (14) are shown, and the simulation results are obtained by averaging over 50, 000 independent runs. The results are compared under different settings of the mean channel gain ratios ϕ 1 , ϕ 2 , ϕ 3 (defined (10)) and interference power threshold I th .…”

Channel prediction in non-regenerative multi-antenna relay selection systems

“…Furthermore, relay systems tend to have much lower implementation complexity [8] than full space-time coded alternatives. Fixed gain amplifyand-forward (AF) relay selection is particularly simple to implement compared to decode-and-forward, and has been well studied for single antenna devices [7,[9][10][11][12]. Non-selective beamforming for single antenna relay or destination devices is an alternative strategy [13], and Da Costa and Aissa [14] had explored a hybrid approach of multi-antenna source and destination communication with a single antenna relay.…”