Multiuser adaptive transmission technique for time-varying frequency-selective fading channels
Multiuser adaptive transmission technique for time-varying frequency-selective fading channels
复制标题
时变频率选择性衰落信道的多用户自适应传输技术
DOI：
10.1016/j.sigpro.2008.02.014
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
K. S. Kim
中科院分区：
文献类型：
--
作者：
Duho Rhee;H. Hwang;Y. Sang;K. S. Kim
该文提出了一种在时变频率选择性衰落信道中考虑反馈时延的多用户自适应调制编码（AMC）方案。通过考虑在给定的预测SNR值下的真实信噪比（SNR）的统计，可以获得满足目标分组错误率（PER）所需的发射功率，并将其用于用户选择、功率分配以及调制和编码集（MCS）选择。此外，一个简单而有用的近似方法获得所需的发射功率的建议。在不考虑反馈延迟和预测误差的情况下，该方案的性能明显优于传统方案。该方案还可以减少反馈资源，同时保持系统的吞吐量分配不同的反馈资源给不同的用户，根据他们的预测误差方差。
This paper proposes an efficient multiuser adaptive modulation and coding (AMC) scheme that considers inevitable feedback delay by employing short-term and long-term channel state information (CSI) in time-varying frequency-selective fading channels. By taking the statistic of the true signal-to-noise ratio (SNR) at a given predicted SNR value into account, the required transmit power to meet the target packet-error-rate (PER) can be obtained and used for user selection, power allocation, and modulation and coding set (MCS) selection. In addition, a simple and useful approximation method of obtaining the required transmit power is proposed. The performance of the proposed scheme is shown to be much better than that of conventional schemes without considering the feedback delay or the prediction error. The proposed scheme can also reduce the feedback resource while maintaining the system throughput by allocating different feedback resources to different users according to their prediction error variances.