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arXiv 1104.1448cs.ITmath.IT
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无线链路中波束成形和MIMO选项评估的基本统一上下文

A Basic Unified Context for Evaluating the Beam Forming and MIMO Options in a Wireless Link

Dmitry Chizhik, Gerard J. Foschini, Reinaldo A. Valenzuela

摘要:

对于一个孤立的无线链路,我们统一看待简单波束成形(BF)与MIMO的对比,看看两者是如何出现的,以及在哪些条件下优势会出现在一个或另一个。通信是从一个高基地阵列到一个用户在混乱。信道传播模型来自基本原理。基站知道功率角谱,但不知道信道实例。场空间自相关的本征态是激励电场的自然模式的驱动因子,是最佳切趾(APOD)。MIMO或BF的偏好取决于APOD谱,其被调查指向各种渐近效应,包括最大BF增益。研究了10%停电时不同本征模功率设置下的性能。我们专注于(1,4)驱动BF的最强模式和(4,4)驱动MIMO的4个最强模式。在代表性的参数设置下获得结果,例如,8度的角展度、2GHz载波、0 dB SNR和1.68m的阵列孔径(4个场去相关长度),其中天线元件间隔为λ/2。我们发现MIMO优于阵列孔径远大于去相关长度,BF几乎以及较小的孔径。

英文摘要:

For one isolated wireless link we take a unified look at simple beamforming (BF) as contrasted with MIMO to see how both emerge and under which conditions advantage goes to one or the other. Communication is from a high base array to a user in clutter. The channel propagation model is derived from fundamentals. The base knows the power angular spectrum, but not the channel instantiation. Eigenstates of the field spatial autocorrelation are the preferred apodizations (APODs) which are drivers of the natural modes for exciting lectric fields. Preference for MIMO or BF depends on APOD spectra which are surveyed pointing to various asymptotic effects, including the maximum BF gain. Performance is studied under varying eigenmode power settings at 10% outage. We focus on (1,4) driving the strongest mode for BF and (4,4) driving the 4 strongest for MIMO. Results are obtained under representative parameter settings, e.g. an angular spread of 8 deg, 2 GHz carrier, 0 dB SNR and an array aperture of 1.68m (4 field decorrelation lengths) with antenna elements spaced as close as lambda/2. We find MIMO excelling for array apertures much larger than the decorrelation length; BF does almost as well for smaller apertures.

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