Noncoherent Block-Coded QAM

• Main Authors: Hsi-Hua Wang, 王熙華
• Other Authors: Ruey-Yi Wei
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/wppzze

碩士 === 國立中央大學 === 通訊工程研究所 === 94 === A novel block coded modulation scheme for noncoherent detection, called noncoherent block-coded MPSK (NBC-MPSK) was proposed recently. Besides, uncoded quadrature amplitude modulation (QAM) with energy constraint methods have been proposed in 2002 and 2005, which have better error performance than uncoded MPSK with the same high data rate. In this thesis, we extend NBC-MPSK to noncoherent block-coded QAM (NBC-QAM). We find out the appropriate ratio of inner and outer radius by the analysis and simulations. Compared with NBC-MPSK, NBC-QAM has larger minimum noncoherent distance and therefore better error performance. We also show that QAM with the energy constraint method proposed in 2005 can be viewed as a special case of NBC-QAM. But in our NBC-QAM scheme, minimum noncoherent distance of QAM can be further enlarged by using more redundant bits.