Abstract
In adaptive beamforming system adaptive algorithm of digital filter is applied to update the weighting vector of the antenna elements to get antenna gain along the desired direction and attenuation along the jammer. The objective of the paper is to evaluate the threshold gain of the adaptive beam former along the line of sight (LOS) between the transmitter and the receiver (including jammer suppression) to make the single hop link comparable with 2-hop link. The single hop and 2-hop communication systems are compared in context of symbol error rate (SER) under fading condition theoretically and verified by simulation. Finally we evaluate the numerical value of threshold gain of adaptive beamformer of two antenna elements under Rayleigh and Nakagami-m fading conditions.
Highlights
To combat the fading affect of long wireless link, 2-hop model is widely used where a relay is placed between transmitter and receiver
In case of Rayleigh fading the threshold gain G becomes 1.86 visualized from Figure 9 where the symbol error rate (SER) is found better than 2-hop for G = 1.76, 4.77 and 6.02 dB but worse than it for G = 1.76 dB
The simulation curves become smothering for more symbols validates the concept Monte Carlo simulation
Summary
To combat the fading affect of long wireless link, 2-hop model is widely used where a relay is placed between transmitter and receiver. This phenomenon attracts the researcher to apply the concept of multi-hop in wireless networks to reduce SER and enhance throughput. In a dense urban area the wireless link is found as time selective channel i.e. SNR of receiver varies with time the gain of the relay has to be adjusted with feedback signal like adaptive algorithm of digital filter. To reduce BER of 3G mobile cellular destined for high speed communication needs to overcome small scale fading (Rayleigh fading) In this context selection of best relay is discussed in [11] with MIMO (multiple input multiple output). Different combination of MIMO (both the hop is MIMO, MISO in first hop and SIMO in second hop, SIMO in first hop and MISO in second hop etc.) is found in recent literature for 2-hop wireless link [11] [12] [13]
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