Throughput performance of an FHMA system with variable rate coding

Author

Park, Andrew S. ; Buehrer, R.Michael ; Woerner, Brian D.

Author_Institution

Watkins Johnson Telecommun. Group, Gaithersburg, MD, USA

Volume

46

Issue

4

fYear

1998

fDate

4/1/1998 12:00:00 AM

Firstpage

521

Lastpage

532

Abstract

We compare throughput bounds for a frequency-hopped multiple-access (FHMA) system employing variable rate as well as fixed rate coding (FRC). Nonfading as well as Rayleigh-fading channels are explored. The throughput bounds for the variable rate coding (VRC) schemes are based on the assumption that the number of active users in the system, m, is known at any time while the bounds for the FRC scheme assumes that the fixed code rate is optimized for the user population mean, λ, where the population is assumed to be Poisson distributed. We present bounds for theoretical “perfect” codes which achieve the capacity as well as bounds for Reed-Solomon (RS) codes of practical block lengths. Finally, we show the dependence of a VRC scheme upon the accuracy of the estimates of m and present a general comparison of the gains of using VRC versus a realistic FRC scheme

Keywords

Poisson distribution; Rayleigh channels; Reed-Solomon codes; fading; frequency hop communication; land mobile radio; multi-access systems; spread spectrum communication; variable rate codes; FH-SS system; FHMA system; Poisson distribution; Rayleigh-fading channels; Reed-Solomon codes; block lengths; fixed code rate; fixed rate coding; frequency-hopped multiple-access; mobile communication services; nonfading channels; perfect codes; throughput bounds; throughput performance; user population mean; variable rate coding; Bandwidth; Communication standards; Error correction codes; Fading; Frequency; GSM; Helium; Rayleigh channels; Spread spectrum communication; Throughput;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.664308

Filename

664308