In this paper, delay-limited transmission of quasi-stationary sources overblock fading channels are considered. Considering distortion outage probabilityas the performance measure, two source and channel coding schemes with poweradaptive transmission are presented. The first one is optimized for fixed ratetransmission, and hence enjoys simplicity of implementation. The second one isa high performance scheme, which also benefits from optimized rate adaptationwith respect to source and channel states. In high SNR regime, the performancescaling laws in terms of outage distortion exponent and asymptotic outagedistortion gain are derived, where two schemes with fixed transmission powerand adaptive or optimized fixed rates are considered as benchmarks forcomparisons. Various analytical and numerical results are provided whichdemonstrate a superior performance for source and channel optimized rate andpower adaptive scheme. It is also observed that from a distortion outageperspective, the fixed rate adaptive power scheme substantially outperforms anadaptive rate fixed power scheme for delay-limited transmission ofquasi-stationary sources over wireless block fading channels. The effect of thecharacteristics of the quasi-stationary source on performance, and theimplication of the results for transmission of stationary sources are alsoinvestigated.
展开▼
