MRC Diversity Reception Research Articles

Performance Analysis of MRC Diversity Reception Over Double Hoyt Fading Channels

Performance Analysis of MRC Diversity Reception Over Double Hoyt Fading Channels

Adaptive Modulation with Diversity Combining Based on Output-Threshold MRC

In this paper, we propose a combined adaptive modulation transmission and output threshold MRC diversity reception scheme for high spectral and power efficiency wireless transceiver design. The modulation constellation size and the number of combined diversity paths are jointly determined to achieve the highest spectral efficiency but with low combining complexity, given the fading channel conditions and the required error rate performance. We derive the statistics of the resulting output signal-to-noise ratio (SNR) and then use it to analyze the proposed system (i) performance in terms of outage probability and average bit error rate, (ii) complexity in terms of the average number of path estimation and the average number of combined paths, and (iii) spectral efficiency. Some selected numerical examples are finally presented and discussed to illustrate the tradeoff offered by this scheme.

Spectrum Efficiency Evaluation for MRC Diversity Schemes Under Different Adaptation Policies Over Generalized Rayleigh Fading Channels

In this paper, closed-form expressions for the capacities per unit bandwidth for Generalized Rayleigh fading channels are derived for optimal power adaptation, constant transmit power, channel inversion with fixed rate, and truncated channel inversion adaptation policies. The closed-form solutions are derived for the single antenna reception (without diversity combining) and MRC diversity reception cases. Optimal power adaptation policy provides the highest capacity over the other adaptation policies both with and without diversity combining. Truncated channel inversion policy suffers a large capacity penalty relative to the optimal power adaptation policy as the number of degrees of freedom is increased. However, with increase in diversity, the capacity penalty for the truncated channel inversion policy decreases. Capacity gains are more prominent for channel inversion with fixed rate policy as compared to the other adaptation policies.

MRC diversity reception of M-ary DPSK signals in slow Nakagami fading channels

The error-rate performance of M-ary DPSK signals received over slow Nakagami fading channels for integer fading index is analysed. A relatively simple expression for computation of the error-rate is presented. This expression is extended to obtain the error-rates of DPSK signals for MRC diversity reception in Nakagami fading. Numerical values for the error-rates are presented.

Average error rate for coherent MPSK signals in Nakagami fading channels

The error rate performance of coherent M-ary phase shift keyed signals in slow nonselective Nakagami fading and additive white Gaussian noise channel is analysed. For real values of the Nakagami fading parameter m, a simple formula is presented for the symbol error rate that can be easily evaluated via numerical integration. A closed-form expression is derived for integer values of m. The effect of N-order MRC diversity reception is also considered.

Error-rate performance of block-codedM-ary modulation and hard decision decoding systems on rayleigh fading channel

Error rates of block-coded MPSK and/or MQAM systems with hard-decision decoding are evaluated theoretically on the Rayleigh fading channel characterizing the land mobile channel. BCH codes are employed as the block codes and analysis is carried out both for nondiversity reception and for dual MRC diversity reception. It is shown that on the Rayleigh fading channel, in contrast to the AWGN channel, BCH-coded MPSK systems can achieve significant coding gain compared to uncoded BPSK even in the hard-decision decoding case without changing spectral efficiency. It is shown also that diversity reception is needed for sufficient large coding gain in higher spectral efficiency. Moreover, it is suggested that the code length longer than a threshold is necessary for large coding gain under the given number of multilevel modulation and given spectral efficiency.