Low-Resolution Quantization in Phase Modulated Systems: Optimum Detectors and Error Rate Analysis

IEEE Open Journal of the Communications Society

Jamie Evans¹  Samiru Gayan¹  Rajitha Senanayake²  Hazer Inaltekin² 

[1] Department of Electrical and Electronic Engineering, University of Melbourne, Parkville, VIC, Australia;School of Engineering, Macquarie University, North Ryde, NSW, Australia;

关键词: Low-resolution ADCs;    maximum likelihood detectors;    symbol error probability;    diversity order;   

DOI  :  10.1109/OJCOMS.2020.3010514

来源: DOAJ

【 摘 要 】

This paper studies optimum detectors and error rate analysis for wireless systems with low-resolution quantizers in the presence of fading and noise. A universal lower bound on the average symbol error probability (SEP), correct for all M-ary modulation schemes, is obtained when the number of quantization bits is not enough to resolve M signal points. In the special case of M-ary phase shift keying (M-PSK), the maximum likelihood detector is derived. Utilizing the structure of the derived detector, a general average SEP expression for M-PSK modulation with n-bit quantization is obtained when the wireless channel is subject to fading with a circularly-symmetric distribution. For the Nakagami-m fading, it is shown that a transceiver architecture with n-bit quantization is asymptotically optimum in terms of communication reliability if n ≥ log₂ M + 1. That is, the decay exponent for the average SEP is the same and equal to m with infinite-bit and n-bit quantizers for n ≥ log₂ M + 1. On the other hand, it is only equal to 1/2 and 0 for n = log₂ M and n <; log₂ M, respectively. An extensive simulation study is performed to illustrate the accuracy of the derived results, energy efficiency gains obtained by means of low-resolution quantizers, performance comparison of phase modulated systems with independent in-phase and quadrature channel quantization and robustness of the derived results under channel estimation errors.

【 授权许可】

Unknown