# A 4-State Asymmetric 8-PSK TCM Scheme for Rayleigh Fading Channels Optimum at High SNR's

Khan, Md Zafar Ali and Rajan, Sundar B (2000) A 4-State Asymmetric 8-PSK TCM Scheme for Rayleigh Fading Channels Optimum at High SNR's. In: 2000 IEEE 51st Vehicular Technology Conference Proceedings. VTC 2000-Spring, 15-18 May, Tokyo,Japan, Vol.1, 685-689.

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We use an asymmetric 8-PSK signal set in a 4-state rate $\frac{2}{3}$ trellis-coded modulation (TCM) scheme for fading channels to show performance gain over known TCM schemes with symmetric and known asymmetric constellations. This scheme is an example of TCM schemes over fading channels where performance gain can be achieved at high SNRs, without increasing the minimum squared product distance, effective length or decreasing the multiplicity. Simulations for Rayleigh fading channels, using Monte Carlo simulation, are presented.