Multiple-Symbol Differential Encoding

• Main Authors: Yu-Hau Huang, 黃俞豪
• Other Authors: Ruey-Yi Wei
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/01617773823710557193

碩士 === 國立中央大學 === 通訊工程研究所 === 100 === Recently, a new differential encoder by a look-up table was proposed. In this thesis, we construct tables of multiple-symbol differential encoding for various constellations that maximize the minimum noncoherent distance. Because differential encoding by a table can be described as differential encoding by a trellis, we use the Viterbi algorithm at the differential detector to improve the error performance. We use a theorem to reduce the number of states of the decoding trellis. Besides, we use decision feedback and set partition to decrease the trellis complexity of multiple-symbol differential decoding.