On the Capacity of Decode-and-Forward Relaying over Rician Fading Channels

被引:100
作者
Bhatnagar, Manav R. [1 ]
机构
[1] Indian Inst Technol Delhi, Dept Elect Engn, IN-110016 New Delhi, India
关键词
Adaptive modulation; capacity; decode-and-forward relaying; Rician fading; ADAPTIVE TRANSMISSION; OUTAGE PROBABILITY; SYSTEMS;
D O I
10.1109/LCOMM.2013.050313.122813
中图分类号
TN [电子技术、通信技术];
学科分类号
080906 [电磁信息功能材料与结构];
摘要
In this letter, we derive the probability density function (PDF) and cumulative distribution function (CDF) of the minimum of two non-central Chi-square random variables with two degrees of freedom in terms of power series. With the help of the derived PDF and CDF, we obtain the exact ergodic capacity of the following adaptive protocols in a decode-and-forward (DF) cooperative system over dissimilar Rician fading channels: (i) constant power with optimal rate adaptation; (ii) optimal simultaneous power and rate adaptation; (iii) channel inversion with fixed rate. By using the analytical expressions of the capacity, it is observed that the optimal power and rate adaptation provides better capacity than the optimal rate adaptation with constant power from low to moderate signal-to-noise ratio values over dissimilar Rician fading channels. Despite low complexity, the channel inversion based adaptive transmission is shown to suffer from significant loss in capacity as compared to the other adaptive transmission based techniques over DF Rician channels.
引用
收藏
页码:1100 / 1103
页数:4
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