Adaptive modulation techniques for duplex OFDM transmission

被引：190
作者：
Keller, T [1 ]
Hanzo, L [1 ]
机构：
[1] Univ Southampton, Dept Elect & Comp Sci, Southampton SO17 1BJ, Hants, England
来源：
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY | 2000年 / 49卷 / 05期
基金：
英国工程与自然科学研究理事会;
关键词：
D O I：
10.1109/25.892592
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The design tradeoffs of turbo-coded burst-by-burst adaptive orthogonal frequency division multiplex (OFDM) wideband transceivers are analyzed. We demonstrate that upon aiming for a higher throughput a higher proportion of low-quality OFDM subcarriers has to be used for the transmission of inherently vulnerable high-order modem modes, transmitting several bits per subcarrier, Upon invoking turbo coding and adjusting the modem mode switching regime near-error-free performance can be achieved at the cost of a reduced throughput. Various blind modem mode detection techniques have also been investigated and the most complex channel coding trellis-based detection algorithm was found to be the most powerful. Last, the design tradeoffs of spectral pre-equalization have been explored and qualtified, We concluded that AOFDM provides a convenient framework for adjusting the required target integrity and throughput both with and without turbo channel coding.
引用
收藏
页码：1893 / 1906
页数：14
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