摘要
Differential modulation was widely used for wireless networks in which channel estimation was diffi-cult.Based on orthogonal design,a novel distributed differential space-time coding/decoding scheme forM-PSK modulations was proposed,which had a high code rate of 2/3 and second-order diversity for thetwo-user cooperative networks.The performance of decode-and-forward (DF) protocols was evaluated.Simulations show that the differential space-time modulation scheme in this paper has better bit error rate(BER) performance or higher code rate than the schemes proposed by Tarasak and Wang when interuserchannel states are good enough.The impacts of transmission error between two users for the whole systemBER performance were also investigated.
Differential modulation was widely used for wireless networks in which channel estimation was difficult. Based on orthogonal design, a novel distributed differential space-time coding/decoding scheme for M-PSK modulations was proposed, which had a high code rate of 2/3 and second-order diversity for the two-user cooperative networks. The performance of decode-and-forward （DF） protocols was evaluated. Simulations show that the differential space-time modulation scheme in this paper has better bit error rate （BER） performance or higher code rate than the schemes proposed by Tarasak and Wang when interuser channel states are good enough. The impacts of transmission error between two users for the whole system BER performance were also investigated.
基金
the National High Technology Research and Development Programme of China(No.2006AA123320)
