arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0705.0252cs.ITmath.IT
收藏

离散输入非遍历块衰落信道的功率分配

Power Allocation for Discrete-Input Non-Ergodic Block-Fading Channels

Khoa D. Nguyen, Albert Guillen i Fabregas, Lars K. Rasmussen

摘要:

我们认为固定速率传输的功率分配算法Nakagami-m非遍历块衰落信道完美的发射机和接收机的信道状态信息和离散的输入信号星座下的短期和长期的功率约束。最优功率分配方案被证明是文献中先前结果的直接应用。我们证明了最优短期方案的SNR指数由Singleton界给出。我们还说明了采用长期的功率约束的显着收益。由于所涉及的表达式的性质,最佳方案的复杂性可能是禁止的系统实现。我们提出了简单的次优功率分配方案,其中断概率性能非常接近最优方案所获得的最小中断概率。

英文摘要:

We consider power allocation algorithms for fixed-rate transmission over Nakagami-m non-ergodic block-fading channels with perfect transmitter and receiver channel state information and discrete input signal constellations under both short- and long-term power constraints. Optimal power allocation schemes are shown to be direct applications of previous results in the literature. We show that the SNR exponent of the optimal short-term scheme is given by the Singleton bound. We also illustrate the significant gains available by employing long-term power constraints. Due to the nature of the expressions involved, the complexity of optimal schemes may be prohibitive for system implementation. We propose simple sub-optimal power allocation schemes whose outage probability performance is very close to the minimum outage probability obtained by optimal schemes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑