Abstract
This paper introduces new detector named newly adaptively designed near maximum likelihood detector (NADD). This detector combines adaptively three types of near maximum likelihood detectors, pseudobinary, pseudoquaternary, and pseudooctonary. The performances of NADD, pseudobinary, pseudoquaternary, and pseudooctonary detectors are measured using data transmission at 9.6 kb/s over telephone channel. Simulation results show that the performance of NADD is better than the performances of pseudobinary, and pseudoquaternary detectors, but little bit worse than the performance of pseudooctonary detector.
Highlights
The Maximum Likelihood Sequence Detector(MLSD) is a procedure for estimating a sequence of bits from a sequence of channel output observables, given a model of the communication system
Another way which is considered in this paper is to use detectors called Near Maximum Likelihood Detectors [19,20,21,22,23,24,25,26]
A series of computer simulation tests have been carried out on the system in Fig. 1 with four types of detectors, BD, QD, OD, and near maximum likelihood detector (NADD) to determine their relative tolerance to Additive White Gaussian Noise (AWGN) when operating over telephone channel
Summary
The Maximum Likelihood Sequence Detector(MLSD) is a procedure for estimating a sequence of bits from a sequence of channel output observables, given a model of the communication system. Considerable researches have used this way to achieve the performance of the VA at reduced complexity [3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18] Another way which is considered in this paper is to use detectors called Near Maximum Likelihood Detectors [19,20,21,22,23,24,25,26]. The transmitter filter is a low-pass filter performs the function of limiting the signal spectrum before modulation process
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