Performance analysis of IEEE 802.11g TCM waveforms transmitted over a channel with pulse-noise interference

Abstract

Trellis-coded modulation (TCM) is a technique that introduces forward error correction (FEC) coding without increasing the bandwidth of the channel signal. TCM combines binary convolution codes with M-ary signal constellation. The application of TCM combines FEC coding and M-ary modulation in one operation. The objective of this thesis is to investigate the performance of an orthogonal frequency-division multiplexing (OFDM) based IEEE 802.11g wireless local area network (WLAN) standard receiver when the waveform is transmitted over an additive white Gaussian noise (AWGN) environment combined with pulse-noise-interference (PNI), for the trellis-coded modulation (TCM) waveform specified by the WLAN standard. In addition to a TCM waveform consisting of a rate r=2/3, 4-state, 8-state and 16-state (K=1, K=2, K=3 and K=4 memory elements) convolution code with 8-phase-shift keying (8-PSK) modulation (analogous to the IEEE 802.11g TCM mode), improvements to the TCM system will be considered. Specifically, two rate r=1/2 convolution codes independently encoding data on the I and Q channels will be modulated with two 4-pulse amplitude modulation (4-PAM) waveforms. Both K=1 and K=2, K=2 and K=3, and K=2 and K=4 convolution codes (constant number of states and constant constraint length, respectively) will be considered.