π/2-shift BPSK A Modulation Scheme Robust to Nonlinear Amplification for CDMA Mobile Communications

Kumud KASHYAP  Tadahiro WADA  Masaaki KATAYAMA  Takaya YAMAZATO  Akira OGAWA  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E80-A    No.9    pp.1634-1639
Publication Date: 1997/09/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section LETTER (Special Section on Nonlinear Theory and its Applications)
Category: 
Keyword: 
π/2-BPSK,  CDMA,  spread spectrum,  nonlinear amplifier,  coherent detection,  differential detection,  

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Summary: 
For mobile communication systems with code division multiple access (CDMA), a new modulation scheme, π/2-shift BPSK, is proposed. The performance has been evaluated in terms of relative out-of-band power, bit-error rate (BER), and spectral efficiency. As the result, it is shown that the proposed scheme has an advantage over conventional BPSK, conventional QPSK, and π/4-shift QPSK under nonlinear amplification.