An efficient equalization scheme for constant envelope modulation receiver affected by quantization error

Kohei Kotera, Osamu Muta, Hiroshi Furukawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The authors have proposed constant envelope modulation (CEM) systems that enable to use a power-efficient nonlinear power amplifier on the transmitter side and a low resolution analog-to-digital converter (ADC) on the receiving side, where power consumption at the analog devices is effectively reduced by employing a low resolution ADC at the receiver. In such a receiver, the received signal is seriously affected by severe quantization error by the ADC and therefore BER performance is degraded. As a solution to performance degradation at the CEM receiver affected by quantization error, in this paper, we propose efficient nonlinear (Viterbi) equalization schemes that estimate both inter-symbol interference in multi-path channel and quantization error in ADC, where quantization error is estimated by using a simple function that models the relation between the received signal level and the resulting quantization error. In addition, the proposed scheme effectively reduces the number of states in Viterbi equalization to achieve computational complexity reduction for equalizations. Computer simulation results show that the proposed nonlinear equalization scheme improves BER performance of CEM receiver seriously affected by quantization error, while computational complexity is effectively reduced.

Original languageEnglish
Title of host publicationProceedings of the 2012 Japan-Egypt Conference on Electronics, Communications and Computers, JEC-ECC 2012
Pages122-126
Number of pages5
DOIs
Publication statusPublished - May 15 2012
Event2012 Japan-Egypt Conference on Electronics, Communications and Computers, JEC-ECC 2012 - Alexandria, Egypt
Duration: Mar 6 2012Mar 9 2012

Publication series

NameProceedings of the 2012 Japan-Egypt Conference on Electronics, Communications and Computers, JEC-ECC 2012

Other

Other2012 Japan-Egypt Conference on Electronics, Communications and Computers, JEC-ECC 2012
Country/TerritoryEgypt
CityAlexandria
Period3/6/123/9/12

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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