Performance of Coded π/2 NS-8QAM Modulation

Changqing LIU  Yu ZHANG  Jian SONG  Changyong PAN  Zhixing YANG  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.5   pp.1612-1614
Publication Date: 2008/05/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.5.1612
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Transmission Systems and Transmission Equipment for Communications
π /2 phase shift NS-8QAM,  channel-nonlinearity,  iterative decoding,  

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Spectrum and Bit Error Rate (BER) performance of a coded π/2 phase shift Non-Square (NS) 8 Quadrature Amplitude Modulation (QAM) system are studied in this letter. The modulation process of this scheme removes all 180 phase shift between adjacent constellation points and contains inherent memory which can be treated as a type of inner coding in coded system. Simulation results show that this modulation scheme has much lower spectrum regrowth and better BER performance when passing through nonlinear channel compared with conventional mode.