Signal Superposition Coded Cooperative Diversity: Analysis and Optimization
The performance of a coded cooperative diversity system employing the Euclidean superposition of two BPSK-modulated signals is analyzed. For an example using a convolutional code on block fading channels, the results show excellent agreement with computer simulations. The analysis makes it possible to optimize the power allocation between the local and relay signals numerically, circumventing the need for time consuming Monte Carlo simulations. The paper is organized as follows. The authors present the system model and establish the notation; the end-to-end packet error rate performance is bounded, numerical results and optimization of the superposition factor.