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Cross-Layer Design for Robust and Scalable Video Transmission in Dynamic Wireless Environment

机译：动态无线环境中稳健可扩展视频传输的跨层设计

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Link adaptation is a promising technique for increasing the data rate and spectral efficiency of wireless data-centric networks, without wasting power or sacrificing the bit error rate (BER) performance. The underlying premise of link adaptation is a real-time balancing of the link budget by dynamically adapting the transmitted power level, modulation (signal constellation size), coding rate, block length (symbol rate), or any combination of these parameters to take advantage of prevailing channel conditions. However, conventional adaptive modulation schemes were primarily designed for wireless networks that carry only homogeneous traffic, and thus may not be well suited for next-generation wireless multimedia networks. This report considers the problem of designing an adaptive hierarchical modulation for supporting multimedia transmission over multipath fading channels, in a cross-layer design paradigm. In particular, a method to mechanize a prioritized unicast transmission using hierarchical modulations at the physical layer in response to the disparate quality of service (QoS) requirements for multimedia traffic in an integrated voice/data networks is discussed.

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