Concatenated sequency majority multiplexing DS-SSMA for synchronous digital communication in indoor wireless narrowband channels

Abstract

A novel synchronous digital spread spectrum multiple access scheme using concatenated sequency majority multiplexing together with direct sequence spread spectrum multiple access is proposed for the indoor wireless narrowband channel environment. Sequency majority multiplexing and concatenated sequency majority multiplexing are binary digital signal multiplexing schemes using sequency diversity instead of the conventional time or frequency diversity. These sequency majority multiplexing schemes exhibit some attractive transmission error recovery abilities when their channel multiplexing capacity is not fully utilised. This paper presents performance analysis and simulation studies of the sequency majority multiplexing and the concatenated sequency majority multiplexing in the additive white Gaussian noise and frequency non-selective flat fading narrowband channels. From these analysis, we proposed a novel approach to synchronous narrowband digital spread spectrum communication systems utilising, the concatenated sequency majority multiplexing scheme together with direct sequence spread spectrum multiple access. In this paper, some theoretical and experimental results are presented for our proposed synchronous narrowband digital spread spectrum scheme with the binary phase shift keying (BPSK) channel modulation technique. The proposed scheme shows promising performance gains and thus it is an attractive candidate for synchronous narrowband digital spread spectrum communication systems in the indoor wireless environment.