Open AccessVariable‐length balanced codes for quadrature phase shift keyed systems
Author(s) -
Tu Xin,
Fair Ivan J.
Publication year - 2015
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2015.0150
Subject(s) - phase shift keying , quadrature (astronomy) , symbol (formal) , computer science , algorithm , mathematics , electronic engineering , bit error rate , decoding methods , engineering , programming language
The authors outline an approach to construct capacity‐approaching balanced quadrature phase shift keyed (QPSK) codes. These codes ensure an equal number of different symbol values and many symbol transitions in the encoded sequence in order to assist practical demodulators to accurately recover symbol values. Their codes are comprised of instantaneously decodable variable‐length codewords that exhibit excellent performance with average code rates higher than previously reported fixed‐length balanced QPSK codes.