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Exact average capacity results for L-branch coherent equal-gain combining (EGC) in correlated and uncorrelated fading channels are not known. This paper develops a novel framework (approach) for capacity analysis of L-branch EGC in generalized fading channels. In addition, Gamma shadowed generalized Nakagami-m fading model is proposed in order to statistically model the fading environments in high...
In this paper, we analyze the ergodic capacity (per unit bandwidth) and Average symbol error probability (ASEP) of an incremental relaying protocol used in conjunction with opportunistic relaying and consider a non-regenerative wireless relay network with Rayleigh fading channels. We consider a selection combining technique at the destination in order to combine the two signals, one from the direct...
The exact performance analysis of MMSE (minimum-mean-square-error) combining for space diversity reception is studied in the presence of a single and multiple cochannel interference (CCI) sources, and compared to maximum-ratio combining (MRC). This paper considers digital cellular mobile radio systems with quadrature amplitude modulation (QAM) transmission and two diversity antennas in flat and quasi-static...
This paper presents a new diversity guided particle swarm optimization algorithm (PSO) named beta mutation PSO or BMPSO for solving global optimization problems. The BMPSO algorithm makes use of an evolutionary programming based mutation operator to maintain the level of diversity in the swarm population, thereby maintaining a good balance between the exploration and exploitation phenomena and preventing...
We evaluate the error performance of a selection diversity (SD) receiver over generalized-K fading channels. The bit-error rate (BER) expression is obtained directly from the cumulative distribution function (CDF), and thus eliminating the need for differentiating the CDF of the combiner output as in the analysis technique used hitherto. Using this approach, we are able to conveniently analyze the...
This paper studies what is the right relay protocol strategy for a low density parity check (LDPC) cooperative diversity scheme. In this scheme, an improved maximum likelihood detection (MLD) featuring Log-likelihood (LLR) combining technique is also introduced. A basic cooperative diversity scheme of a source node (S), a relay node (R) and a common destination node (D) is considered. This scheme...
Closed-form expressions for the capacity of dual-selection combining and maximal-ratio combining diversity systems over slowly varying correlated Hoyt fading channels has been presented. Different power and rate adaptation techniques available in the literature has been considered for the capacity analysis. A study on the effects of correlation and fading parameters on the channel capacity of the...
This paper considers the problem of routing packets across a multi-hop wireless network while ensuring throughput optimality. One of the main challenges in the design of throughput optimal routing policies is identifying appropriate and universal Lyapunov functions with negative expected drift. The few well-known throughput optimal routing policies in the literature are constructed using simple quadratic...
The performance of selection diversity over independent but not necessarily identically distributed Nakagami fading channels is studied. An exact closed-form expression for the probability density function of the selected channel signal-to-noise ratio is derived. Exact closed-form expressions for the corresponding cumulative distribution function, moment generating function and moments are also obtained...
It has generally been accepted that in a two-branch diversity receiver a near maximum diversity advantage is realized when the cross correlation between the two branches is less than 0.7. Based on this figure, space diversity reception at the mobile presents little problem since the antenna separation distances that achieve this mount of decorrelation in the mobile environment are very small (≤20...
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