PERFORMANCE STUDY OF ITU RECOMMENDATION G726
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Abstract
Due to its importance and its wide applications in telecommunication networks, the Adaptive Differential Pulse Code Modulation(ADPCM) was standardized by International Telecommunication Union(ITU) as recommendation G726. This recommendation represents four algorithms of ADPCM, 40kb/s, 32kb/s, 24kb/s, and 16kb/s. This paper studies the performances of these for algorithms using QAM signal at data rate of 9.6kb/s. The simulation results show that the performance of 40kb/s algorithm is better than that of 32kb/s algorithm, and the performance of 32kb/s algorithm is better than that of 24kb/s algorithm, and the latter is better than that of 16kb/s algorithm
Ref. 16, fig. 4
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