Channel Capacity of Differential Amplitude Pulse-Position Modulation (DAPPM) over Indoor Optical Wireless Communications

U. Sethakaset, T. Gulliver
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引用次数: 7

Abstract

Differential amplitude pulse-position modulation (AtimesL-DAPPM) over an indoor optical wireless link can be represented as a Markov source transmitted over a finite-state machine channel. The state-transition probabilities that maximize the information rate are determined by using expectation-maximization. Then, the channel capacity of DAPPM is obtained and compared to that of pulse-position modulation (L-PPM) and differential pulse-position modulation (L-DPPM). It is shown that DAPPM achieves a higher capacity and is less sensitive to multipath dispersion than PPM and DPPM
差分幅度脉冲位置调制(DAPPM)在室内无线光通信中的信道容量
差分幅度脉冲位置调制(AtimesL-DAPPM)可以表示为在有限状态机信道上传输的马尔可夫源。利用期望最大化法确定信息率最大化的状态转移概率。然后,得到了DAPPM的信道容量,并与脉冲位置调制(L-PPM)和差分脉冲位置调制(L-DPPM)的信道容量进行了比较。结果表明,DAPPM比PPM和DPPM具有更高的容量和较低的多径色散敏感性
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