Title :
Channel Capacity of Differential Amplitude Pulse-Position Modulation (DAPPM) over Indoor Optical Wireless Communications
Author :
Sethakaset, Ubolthip ; Gulliver, T. Aaron
Author_Institution :
Dept. of Electr. & Comput. Eng., Victoria Univ., BC
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
Keywords :
Markov processes; amplitude modulation; channel capacity; expectation-maximisation algorithm; finite state machines; indoor radio; optical communication; probability; pulse position modulation; DAPPM; Markov source; channel capacity; differential amplitude pulse-position modulation; expectation-maximization method; finite-state machine channel; indoor optical wireless link; state-transition probability; Amplitude modulation; Channel capacity; Optical modulation; Optical noise; Optical pulses; Optical receivers; Optical sensors; Pulse modulation; Wireless communication; Working environment noise;
Conference_Titel :
Communications, 2006. APCC '06. Asia-Pacific Conference on
Conference_Location :
Busan
Print_ISBN :
1-4244-0574-2
Electronic_ISBN :
1-4244-0574-2
DOI :
10.1109/APCC.2006.255857
