Title :
A bandwidth efficient modem for personal satellite terminals
Abstract :
Personal satellite communications is constrained by both bandwidth and power, with mobility requirements demanding compact, low cost and highly efficient user terminal equipment, whilst system capacity requirements demand an efficient usage of the limited satellite bandwidth available. This paper describes a bandwidth efficient modulation (BEM) scheme that combines power and bandwidth efficiency for multi-user communication over a satellite channel. Results of initial performance tests generated using a modem simulator are presented, illustrating the effect of frequency and timing errors on the working of the scheme.
Keywords :
digital simulation; modems; multi-access systems; multiuser channels; personal communication networks; quadrature phase shift keying; telecommunication equipment testing; telecommunication terminals; O-QPSK; QPSK; bandwidth efficient modem; bandwidth efficient modulation; efficient user terminal equipment; frequency errors; low cost user terminal equipment; mobile satellite service; modem simulator; multi-user communication; offset-QPSK; performance test results; personal satellite communications; personal satellite terminals; power efficiency; quadrature phase shift keying; satellite bandwidth; satellite channel; system capacity; timing errors;
Conference_Titel :
Personal Broadband Satellite (Ref. No. 2002/059), IEE Seminar on
DOI :
10.1049/ic:20020025
