Analysis of the Multimodulus Blind Equalization Algorithm for Non-Square QAM Signal Constellations

• Main Authors: Lin-Wei Chang, 張琳韋
• Other Authors: Jenq-Tay Yuan
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/59929890141451297113

碩士 === 輔仁大學 === 電子工程學系 === 94 === This thesis mathematically analyzes a multimodulus blind equalization algorithm (MMA) for non-square quadrature amplitude modulation (QAM) signal constellations. The analyses will focus on two different non-square constellations: i) we propose a gain control (GC) compensation scheme that improves the performance of a multimodulus blind equalization algorithm for cross QAM signal constellations. The scheme may improve carrier-phase recovery, which in turn generates a lower symbol-error rate (SER) than the original MMA for cross QAM signal constellations. ii) The analysis of rectangular constellations indicates that the MMA that uses non-square rectangular constellations may be better able to recover the phase rotation introduced by channels than the MMA that uses the cross constellations, although the former is known to require more average transmitted power than the latter two. The analysis also demonstrates that the MMA that uses non-square rectangular constellations does not have any undesirable minimum and may be less likely attracted to saddle points than the MMA that uses both square and cross constellations, because the former has fewer saddle points than the latter two constellations.