DECT系统中的切换天线分集

IEEE Second Symposium on Communications and Vehicular Technology in the Benelux Pub Date : 1994-11-02 DOI:10.1109/SCVT.1994.574156

J.-P. van Deursen, M. Jansen

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引用次数: 1

摘要

为了对抗DECT系统中多径传播的信号衰减效应，可以采用分集技术。分析了基于接收功率的开关天线分集方案的性能，并与具有瑞利和瑞利衰落特性的频率非选择信道的选择分集性能进行了比较。选择接收到的输出功率统计数据作为性能度量。推导了具有不等支路统计量的双支路切换分集性能、天线(空间)相关性和后续时间样本之间的(部分)时间相关性的表达式。结果表明，切换分集性能始终不如选择分集性能，Rice因子对分集增益的影响呈非线性。两种分集方案都对不等分支统计量敏感，但切换分集增益恶化最快。天线相关性对切换分集的性能影响不大。最后，还表明，如果后续时间样本之间只有部分时间相关，则切换分集的分集增益将大大降低。

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Switched antenna diversity within a DECT system

To combat the signal-degrading effects of multipath propagation in a DECT system, diversity techniques can be employed. The performance of a switched antenna diversity scheme based on received power is analyzed and compared with the performance of selection diversity for a frequency non-selective radio channel with either Rayleigh or Rician fading characteristics. Received output power statistics are chosen as performance measure. Expressions are derived for the performance of two-branch switched diversity with unequal branch statistics, antenna (space) correlation and (partial) time correlation between succeeding time samples. Results show that switched diversity performance is always inferior to selection diversity performance and that the Rice factor influences the diversity gain non-linearly. Both diversity schemes are sensitive to unequal branch statistics, while switched diversity gain deteriorates fastest. Antenna correlation does not have a large influence on the performance of switched diversity. Finally, it is also shown that the diversity gain with switched diversity is reduced considerably if there is only partial time correlation between succeeding time samples.

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IEEE Second Symposium on Communications and Vehicular Technology in the Benelux

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