Performance Optimization of Digital Communications Systems

Chapter 6

Optimization of the Automatic Repeat Request Parameters in Quadrature Amplitude Modulation Channels

6.1    Background

Broadband and high-quality wireless communication systems have been standardized recently in the European Telecommunications Standards Institute (ETSI) Broadband Radio Access Network (BRAN) [1] and IEEE 802.16 [2]. To realize high-quality broadband wireless communications, the use of automatic repeat request (ARQ) in combination with forward error correction (FEC) is being considered. In wireless communications, if there are some obstructions interfering with the signal transmitted, consecutive frame errors (burst errors) occur. Thus, ARQ is especially required. Several ARQ schemes have been proposed and introduced ...