Capacity of AWGN and Fading Channels with BPSK/QPSK Modulation

Pei YANG  Hongwen YANG  

IEICE TRANSACTIONS on Communications   Vol.E101-B   No.5   pp.1183-1190
Publication Date: 2018/05/01
Publicized: 2017/11/08
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017EBP3283
Type of Manuscript: PAPER
Category: Fundamental Theories for Communications
capacity,  AWGN channel,  Rayleigh fading,  Nakagami fading,  Rice fading,  

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In recent years, since Turbo and LDPC codes are very close to the Shannon limit, a great deal of attention has been placed on the capacity of AWGN and fading channels with arbitrary inputs. However, no closed-form solution has been developed due to the complicated Gaussian integrations. In this paper, we investigate the capacity of AWGN and fading channels with BPSK/QPSK modulation. First, a simple series representation with fast-convergence for the capacity of AWGN is developed. Further, based on the series expression, the capacity of fading channels including Rayleigh, Nakagami and Rice fading can be obtained through some special functions. Numerical results verify the accuracy and convergence speed of the proposed expressions for the capacity of AWGN and fading channels.