Coding of PPM based modulation techniques to improve the performance of infrared WLANs

Author

Alves, Rui ; Gameiro, Atilio

Author_Institution

Inst. de Telecomunicacoes, Aveiro, Portugal

Volume

3

fYear

2000

fDate

2000

Firstpage

1345

Abstract

In this communication we consider the use of PPM based modulation methods, such as the hybrid modulation method called amplitude and pulse-position modulation (APPM) and overlapping pulse-position modulation (OPPM), to improve the performance of infrared WLANs. The bandwidth efficiency expressions of these modulation schemes are presented and compared against the one of pulse-position modulation (PPM), which allows to conclude that both APPM and OPPM can be used to improve the performance of PPM without significant bandwidth expansion, using trellis-coded modulation (TCM) codes. We also derive the best codes for some APPM and OPPM schemes, and the results show that non-negligible coding gains without bandwidth expansion can be obtained with trellis codes of moderate complexity

Keywords

amplitude modulation; optical communication; optical modulation; pulse position modulation; trellis coded modulation; wireless LAN; APPM; OPPM; PPM based modulation techniques; TCM codes; amplitude and pulse-position modulation; bandwidth efficiency; coding gain; complexity; hybrid modulation method; infrared WLAN; optical communication; overlapping pulse-position modulation; performance; trellis codes; trellis-coded modulation codes; Amplitude modulation; Bandwidth; Modulation coding; Optical distortion; Optical noise; Optical receivers; Optical transmitters; Power system modeling; Pulse modulation; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2000. IEEE-VTS Fall VTC 2000. 52nd

Conference_Location

Boston, MA

ISSN

1090-3038

Print_ISBN

0-7803-6507-0

Type

conf

DOI

10.1109/VETECF.2000.886317

Filename

886317