Microwave Mobile Communications
Microwave Mobile Communications
Design of an Adaptive Architecture for Energy Efficient Wireless Image Communication
Embedded Processor Design Challenges: Systems, Architectures, Modeling, and Simulation - SAMOS
Design of an adaptive architecture for energy efficient wireless image communication
Embedded processor design challenges
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A hybrid ARQ in which the transmitter adaptively selects an FEC code accordingto the channel condition is presented and analyzed. The code is selectedaccording to the past transmissions and acknowledgements by an algorithm whichis a generalization of that in [1]. The throughput is obtained as a functionof the frame error rate for a general system employing the adaptive hybrid ARQwith acknowledgements that arrive instantly on an error-free return channel.The throughput is obtained as a function of the signal-to-noise ratio for anexample quad rate system employing convolutional codes with non-coherentfrequency shift keying over the uncorrelated Rayleigh fading channel. Thisallows the best choice for the parameters of the algorithm to be made. In thecase that the channel bit errors are independent, the generalization offersperformance improvement of less than 10% over that in [1]. But when thechannel errors are bursty, as in the case of Rayleigh fading with finite bitinterleaving, the generalization offers throughput improvement as high as24%.We go on to consider incorporating code combining with the adaptive scheme toform an adaptive memory hybrid ARQ. Simulation of a system using complementarypunctured convolutional codes with 4 code rates shows that 2-level codecombining can extend the adaptive scheme‘s useful throughput into the low SNRregion by approximately 4 dB.