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Envelope-aided Viterbi receivers for GMSK signals with limiter-discriminator detection
- Source :
- IEEE Transactions on Communications. Oct, 2004, Vol. 52 Issue 10, p1733, 14 p.
- Publication Year :
- 2004
-
Abstract
- Continuous phase modulation schemes, such as Gaussian minimum-shift keying (GMSK), are frequently used with limiter-discriminator (LD) detectors. This paper studies how the side information derived from the signal envelope can enhance the performance of a Viterbi algorithm (VA)-based receiver operating on the LD output of a GMSK scheme. By considering the joint probability density function of envelope and frequency, different approximations yield different novel metrics for VA, using the three-variables envelope and its derivative, and frequency error in different combinations. Simulation results confirm that such envelope-aided VA gives significant performance gains, and that envelope information complements the frequency information output by the LD detector in frequency-selective fading channels. Index Terms--Envelope information, Gaussian minimum-shift keying (GMSK), limiter discriminator (LD), maximum-likelihood sequence detector (MLSD), multipath channel.
Details
- Language :
- English
- ISSN :
- 00906778
- Volume :
- 52
- Issue :
- 10
- Database :
- Gale General OneFile
- Journal :
- IEEE Transactions on Communications
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.124560696