ISI Suppression Techniques for the Orthogonal Multirate Modulation System in the Presence of Pulse Truncation and Timing Offset

• Main Authors: Hsin-Kai Huang, 黃信凱
• Other Authors: Char-Dir Chung
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/27302530116479435732

碩士 === 國立臺灣大學 === 電信工程學研究所 === 99 === The orthogonal multirate (MR) modulation signal is constructed by the orthogonal multiplexing of block-precoded component modulation waveforms occupying the Nyquist bandwidth and shown to provide the same bandwidth efficiency as the nonorthogonal MR modulation signal, while giving the better error performance. The realizable orthogonal MR modulation schemes can offer the same error performance as the square-root-raised-cosine-pulsed modulation scheme, while providing prevailing bandwidth efficiencies by using sufficiently large block sizes. In this thesis, two self-cancellation schemes are proposed to suppress the effect of intersymbol interference (ISI) caused by pulse truncation and timing offset in the orthogonal MR receiver. The system performance characteristics are evaluated based on signal-to-interference ratio, bit error rate, peak-to-average power ratio and implementation complexity. It is shown that both self-cancellation schemes are effective in suppressing the effect of intersymbol interference without trading off peak-to-average power ratio (PAPR) and implementation complexity significantly.