Speed-Optimized Soft-Decision Demodulation of Multilevel DAPSK

Near-Capacity Turbo Coded Soft-Decision Aided DAPSK/Star-QAM for Amplify-and-Forward Based Cooperative Communications

“…More specifically, a sub-optimal yet high-complexity soft Viterbi decoding metric was proposed in [7], [8], [10], which requires a high SNR and a slowly fading channel. In order to reduce the high computational complexity of the receiver, the authors of [9] quantized the received signals as part of the demodulation process based on the maximum likelihood sequence estimator derived in [8]. As another approach of reducing the complexity, the idea of decoupling the joint amplitude and phase detection, the Bit Metric of Iterative a posteriori probability (APP) Decoders (BMIAD), was proposed as an improvement by [10].…”