Performance analysis of generalized differential modulation using DAPSK for bi-directional relay networks

Block by block differential encoding is proposed for two-way relay network using amplify and forward protocol at the relays. In order to achieve bandwidth efficiency the bits are mapped into 16-ary differential amplitude phase shift keying (DAPSK) symbols. Phase estimation and reference carrier estimation at the receiver is avoided by using this non-coherent detection technique. The symbols are mapped using 16-level Differential amplitude phase shift keying technique. The proposed method improves the symbol error rate performance of the non-coherent differential modulation scheme.