Title :
Trellis codes based on amplitude and position modulation for infrared WLANs
Author :
Alves, R. ; Gameiro, A.
Author_Institution :
Dept. de Electron. e Telecomunicacoes, Inst. de Telecomunicacoes, Aveiro, Portugal
Abstract :
In this communication we consider the use of an hybrid modulation method called amplitude and pulse-position modulation (APPM) in infrared WLAN. In this hybrid method the information is conveyed both in the position and amplitude of a pulse. The bandwidth efficiency and the capacity of this new modulation scheme are derived and compared against pulse-position modulation (PPM), which allows us to conclude that APPM can be used to improve the performance of PPM without bandwidth expansion, using trellis-coded modulation (TCM) codes. We also derive the best trellis codes for some A×2-APPM, and the results show that non-negligible coding gains can be obtained with trellis codes of moderate complexity
Keywords :
amplitude modulation; channel capacity; optical links; performance evaluation; pulse position modulation; trellis coded modulation; wireless LAN; APPM; TCM codes; amplitude and pulse-position modulation; bandwidth efficiency; capacity; complexity; hybrid modulation method; infrared WLAN; performance; trellis-coded modulation; Additive noise; Amplitude modulation; Convolutional codes; Modulation coding; Optical distortion; Optical noise; Optical receivers; Optical transmitters; Pulse modulation; Wireless LAN;
Conference_Titel :
Vehicular Technology Conference, 1999. VTC 1999 - Fall. IEEE VTS 50th
Conference_Location :
Amsterdam
Print_ISBN :
0-7803-5435-4
DOI :
10.1109/VETECF.1999.800324
