Research On Relay Capacity Analysis And Power Allocation Of Cooperative Communication System

Cooperative communication realizes spatial diversity advantages in a distributed manner, in which the wireless nodes help each other relay information and form a virtual MIMO array. Since this transmission technique can provide significant performance gains in terms of link reliability, spectral efficiency, system capacity, and transmission range, the analysis and designing of cooperative communication wireless systems has been widely studied over the Last couple of years, making the introduction and integration of cooperative communication into the next generation wireless standards. LTE-Advance become pressing for designing an efficient and reliable fu Ily-distributed wireless network. Nonetheless, there are various technical challenges and open issues to be resolved before this promising concept becomes an integral part of the modern wireless communication devices.In cooperative wireless networks, power resources for each node are limited. In consequence, the optimal power allocation is a hot key technique to achieve the full potentials of relay-assisted transmission promised by the information–theoretic results.Firstly, the approach of amplify and forward protocol, the system equivalent channel model and signal mathematical expressions are introduced. Then we analysis symbol error rate and channel capacity for three-node two-hop, mufti-branch two-hop systems of AF, and the index of symbol error rate has been verified by simulations.Secondly, we detail three approaches of decode and forward protocol, the system equivalent channel models and signal mathematical expressions give the analysis of channel capacity for three-node two-hop, multi-branch two-hop system of DF, Finally,based on the analysis of system performance, Moreover, the results show that performance for AF and DF system have been significantly improved by our methods.