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AN EFFICIENT FIXED RATE TRANSMISSION SCHEME OVER DELAY-CONSTRAINED WIRELESS FADING CHANNELS

By X. Gao and Y. Zhu

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Abstract:
In this paper, we study the scheduler design problems over delay-constrained wireless communication links. Following a crosslayer design approach, the wireless system is modeled as a joint link-PHY layer architecture with a finite-length buffer and continuousstate fading links. A heuristic and efficient fixed rate transmission scheduler scheme (FRT) is proposed. We formulate and analyze the performance of the FRT scheme in terms of power efficiency and packet drop rate. Compared with variable rate schemes, the FRT scheme can considerably simplify the hardware implementation of transmitter. In addition, we show that the optimization of FRT scheme can be conducted with significantly reduced computational cost by utilizing the sparse feature of the transition probability matrix. Moreover, the simulation results show that at the packet drop rate of 10-3, the optimized average transmit power of FRT scheme is only 0.5 dB higher than the known optimal variable rate scheme, indicating that the FRT scheme is quite power efficient as well. Therefore, we conclude that the FRT scheme is more feasible than variable rate schemes in practical delayconstrained wireless systems with regard to both hardware cost and power efficiency.

Citation:
X. Gao and Y. Zhu, "An efficient fixed rate transmission scheme over delay-constrained wireless fading channels," Progress In Electromagnetics Research C, Vol. 48, 133-139, 2014.
doi:10.2528/PIERC13111104
http://www.jpier.org/pierc/pier.php?paper=13111104

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