Analysing generator matrices G of similar state but varying minimum determinants

[摘要] Since Tarokh discovered Space-Time Trellis Code (STTC) in 1998, a considerable effort has been done to improve the performance of the original STTC. One way of achieving enhancement is by focusing on the generator matrix G, which represents the encoder structure for STTC. Until now, researchers have only concentrated on STTCs of different states in analyzing the performance of generator matrix G. No effort has been made on different generator matrices G of similar state. The reason being, it is difficult to produce a wide variety of generator matrices G with diverse minimum determinants. In this paper a number of generator matrices G with minimum determinant of four (4), eight (8) and sixteen (16) of the same state (i.e., 4-PSK) have been successfully produced. The performance of different generator matrices G in term of their bit error rate and signal-to-noise ratio for a Rayleigh fading environment are compared and evaluated. It is found from the MATLAB simulation that at low SNR (14) there is no significant difference between the BER of these generator matrices G.

[发布机构] Avionics Section, UniKL MIAT, Malaysia^1;Aerospace Engineering Department, Universiti Putra Malaysia, Malaysia^2

[学科分类] 航空航天科学

[关键词] Encoder structure;Fading environment;Generator matrix;High SNR;Low SNR;Matlab simulations;Rayleigh;Space-time trellis codes