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引用次数: 6
摘要
空时编码是多发射天线通信系统中对抗短时衰落的有效技术。本文提出了这种系统的多维框架，对比了为天线分配信号维度的两种方法。在聚合发射天线(ATA)中，一个维度由所有天线使用，而在正交发射天线(OTA)中，每个维度由单个发射天线使用。我们提供了重复码和Tarokh-Seshadri-Calderbank(参见IEEE Transactions on Information Theory, vol.44, p.744- 64,1998)码的分集顺序分析。给出了使用OTA和ATA传输的重复、TSC和经典卷积码的仿真结果。使用ATA，经典卷积码的性能与已知的TSC码相当，而使用OTA则比使用ATA更容易获得分集增益。本文中使用OTA的所有代码都显示了相对于ATA的性能提升。
A transmit-diversity coding framework for cellular systems
Space-time (ST) coding is an efficient technique for combatting short-term fading in telecommunication systems with multiple transmit antennas. This paper presents a multi-dimensional framework for such a system that contrasts two approaches for assigning signal dimensions to antennas. With aggregate transmit antennas (ATA), a dimension is employed by all the antennas while in orthogonal transmit antennas (OTA), each dimension is employed by a single transmit antenna. We provide a diversity order analysis for repetition codes and Tarokh-Seshadri-Calderbank (see IEEE Transactions on Information Theory, vol.44, p.744-64, 1998) codes within our framework over a spatially uncorrelated, block-fading Rayleigh channel. Simulation results for repetition, TSC, and classical convolutional codes using both OTA and ATA transmission are presented. With ATA, classical convolutional codes perform comparably to the known TSC codes, while with OTA diversity gain is easier to obtain than with ATA. All the codes that were considered in this work with OTA show performance gains with respect to ATA.
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