Improved Designs of Differential Spatial Modulation

• Main Authors: Tzu-Yun Lin, 林子勻
• Other Authors: Ruey-Yi Wei
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/2qnag9

碩士 === 國立中央大學 === 通訊工程學系 === 106 === Differential spatial modulation (DSM) is a multi-antenna technique that uses only one antenna to transmit signals at a time and avoids pilot overhead. By selecting the transmitting antenna, additional data bits can be transmitted. The conventional DSM is extremely complex. We aim to reduce the complexity of DSM in this thesis. The complexity of noncoherent maximum-likelihood (ML) detector of conventional DSM increases exponentially with the number of transmitter antennas. In this thesis, we propose a new ML detector whose complexity is roughly in proportional to the number of transmitter antennas. On the other hand, since the complex-valued antenna-index matrices causes the constellation of the transmitted signal has unlimited points, we have also proposed a systematically designed complex-valued antenna index matrices so that the transmitted signal constellation has a few signals points only. Both the proposed techniques decrease the complexity without sacrificing error performance. In a recent paper, DSM used in downlink large-scale transmission antenna systems was proposed. This thesis also points out that it may be too far away from the signal continuously transmitted by the same antenna, resulting in bad error performance for time-varying fading channels. Therefore, we propose a method which has a better error performance in time-varying fading channels.