Channel quality estimation and rate adaptation for cellular mobile radio
Channel quality estimation and rate adaptation for cellular mobile radio
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DOI：
10.1109/49.778183
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发表时间：
1999-07
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影响因子：
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通讯作者：
K. Balachandran;Srinivas R. Kadaba;S. Nanda
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作者：
K. Balachandran;Srinivas R. Kadaba;S. Nanda
我们提出了一种根据信号与干扰加噪声比 (SINR) 来测量衰落信道上信号传输的信道质量的技术。与解码的信息序列或其适当的修改相关联的欧几里德距离(ED)度量被用作信道质量测量。仿真表明，滤波或平均度量是一种可靠的信道质量度量，它在不同的编码调制方案和不同的移动速度下保持一致。平均缩放 ED 度量可以映射到每个符号的 SINR。除了移动辅助切换 (MAHO) 和功率控制之外，我们还建议使用此 SINR 估计来进行数据速率自适应。我们特别关注数据速率自适应，并提出了一组编码调制方案，利用 SINR 估计在调制之间进行自适应，从而提高数据吞吐量。仿真结果表明，所提出的度量在整个多普勒范围内运行良好，可为平均 SINR 提供近乎最优的速率自适应。这种适应方法可以平均掉瑞利衰落造成的短期变化，并适应阴影等长期影响。在低多普勒情况下，该度量可以跟踪瑞利衰落并将速率与 SINR 的短期平均值相匹配，从而进一步提高吞吐量。
We propose a technique to measure channel quality in terms of signal-to-interference plus noise ratio (SINR) for the transmission of signals over fading channels. The Euclidean distance (ED) metric, associated with the decoded information sequence or a suitable modification thereof, is used as a channel quality measure. Simulations show that the filtered or averaged metric is a reliable channel quality measure which remains consistent across different coded modulation schemes and at different mobile speeds. The average scaled ED metric can be mapped to the SINR per symbol. We propose the use of this SINR estimate for data rate adaptation, in addition to mobile assisted handoff (MAHO) and power control. We particularly focus on data rate adaptation and propose a set of coded modulation schemes which utilize the SINR estimate to adapt between modulations, thus improving the data throughput. Simulation results show that the proposed metric works well across the entire range of Dopplers to provide near-optimal rate adaptation to average SINR. This method of adaptation averages out short-term variations due to Rayleigh fading and adapts to the long-term effects such as shadowing. At low Dopplers, the metric can track Rayleigh fading and match the rate to a short-term average of the SINR, thus further increasing throughput.