Optimal pilot-to-data power ratio for MIMO-OFDM

Taeyoon Kim, J. Andrews
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引用次数: 29

Abstract

Orthogonal frequency division multiplexing (OFDM) can be used with a multiple-input multiple-output (MIMO) system to improve communication quality and capacity. Pilot-symbol-aided or decision-directed channel estimation must be used to track channel variations in MIMO-OFDM systems. While pilot symbols facilitate channel estimation, they reduce the transmit energy for data symbols under a fixed total transmit power constraint. We analyze the effects of pilot-symbol-aided channel estimation on the lower bound of the capacity and derive the optimal pilot-to-data power ratio (PDPR) in MIMO-OFDM systems with three different types of pilot patterns: independent, scattered, and orthogonal. The result implies that implementing the optimal PDPR in an actual MIMO-OFDM system should prove relatively straightforward, since there is a surprisingly broad range of PDPR values over which near optimal capacity is achieved.
MIMO-OFDM的最优导频数据功率比
正交频分复用(OFDM)可以与多输入多输出(MIMO)系统配合使用,以提高通信质量和容量。在MIMO-OFDM系统中,必须使用导频符号辅助或决策导向信道估计来跟踪信道变化。虽然导频符号有助于信道估计,但在固定的总发射功率约束下,导频符号减少了数据符号的发射能量。我们分析了导频符号辅助信道估计对容量下界的影响,并推导了具有独立、分散和正交三种不同导频模式的MIMO-OFDM系统的最优导频数据功率比(PDPR)。结果表明,在实际的MIMO-OFDM系统中实现最优PDPR应该是相对简单的,因为PDPR值的范围非常广,接近最优容量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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