Performance analysis of transmit beamforming and relay selection with feedback delay and channel estimation errors

In this paper, a general framework of evaluating the joint effects of feedback delay and channel estimation errors (CEE) is formulated for two-hop amplify-and-forward (AF) relaying systems with transmit beamforming (TB) and relay selection. We derived closed-form expressions for important performance measures including the ergodic capacity, exact analysis and lower bounds of outage probability as well as average symbol error rate (SER) performance. Numerical results verify the theoretical analysis and illustrate the decremental effects of feedback delay and CEE on the system performance.