Multiuser detection for MFSK frequency-hopped multiple access systems

Yu-Ted Su*, Chu Ya Hsiao, Ching P. Hung

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

8 Scopus citations


The capacity of a multilevel FSK (MFSK), frequency-hopped multiple access (FHMA) system is dictated by two major design concerns: the hopping pattern and the receiver structure. This paper studies the impacts of both factors. We present a maximum likelihood (ML) diversity combiner for asynchronous FHMA systems in Rayleigh fading and compare systems using random hopping patterns and those that use a set of optimal hopping patterns. On the other hand, a multiuser detector for an FHMA/MFSK system usually consists of two stages. The first stage makes an initial decision while the second stage tries to resolve the ambiguity and reduce the cochannel interference (CCI) left by the first stage detector. After analyze the performance of the first stage detector that uses appropriate diversity combining, we then examine the effectiveness of a second stage detector which is a modification of an earlier structure developed by Timor. This receiver is of modest complexity and is capable of removing most of the CCI. Moreover, we also find that it is insensitive to power variations of the system users.

Original languageEnglish
Article number503475
Pages (from-to)387-391
Number of pages5
JournalIEEE Vehicular Technology Conference
StatePublished - 28 Apr 1996
EventProceedings of the 1996 IEEE 46th Vehicular Technology Conference. Part 1 (of 3) - Atlanta, GA, USA
Duration: 28 Apr 19961 May 1996

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