Distributed Differential Space-Time Modulation for Multi-Source Cooperative Communications

• Main Authors: Jia-Liang Jian, 簡嘉良
• Other Authors: Ruey-Yi Wei
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/38006939013679949449

碩士 === 國立中央大學 === 通訊工程學系 === 105 === Cooperative communications can achieve the spatial diversity effectively without using multi-antennas. Distributed space-time coding, one kind of cooperative communications, uses multiple relays with single antenna to form virtual antenna arrays. By doing so, it acquires spatial diversity and thus improves the system performance. Among them, distributed differential space-time modulation utilizes differential encoding such that the receiver does not need channel coefficients. In this thesis, we study differential space-time network coding for multi-source cooperative communications which overcomes the problems of imperfect synchronization and complicated channel estimation. We propose to use distributed differential space-time modulation for multi-source cooperative communications, and compare its error performance with differential space-time network coding. According to the simulation results, distributed differential space-time modulation scheme which we proposed has better error performance than network coding, irrespective of synchronization issue.