Optimized Channel Coding of Control Channels for Mobile Packet Communication

Song, Young-Joon

Journal of the Korean Institute of Electromagnetic and Science 2003;3(1):50-56.

Dept. of Electronic Engineering, Kum-Oh Nat′l Institute of Tech.

Abstract

This paper proposes a coding scheme of control channel for mobile packet communication to maximize the minimum Hamming distance, which is based on shifting of basis vectors of Reed Muller code with optimized dynamic puncturing and/or(partial) sequence repetition. Since the maximum likelihood decoding can be performed using the extremely simple FHT(Fast Hadamard Transformation), it is suitable for real time optimum decoding of control channel information with very little complexity. We show applications of the proposed coding method to TFCI(Transport Format Combination Indicator) code in split and normal modes of 3GPP W-CDMA system. We also discuss how this method can reduce rate indication error over AWGN(Additive White Gaussian Noise) as well as fading channels when the proposed coding scheme is applied to 1xEV-DV system of $3^{rd}$TEX> generation partnership project 2(3GPP2) to indicate the data rate transmitted on the reverse traffic channel by a Mobile Station(MS).

Key words: Reed Muller Code, FHT, W-CDMA, TFCI, 1xEV-DV, RRI