Performance of asynchronous tandem standard 32 Kb/s ADPCM systems using QAM signal

Muhanned Farhan Abdul-Hameed AL-Rawi; Muaayed Farhan Abdul-Hameed AL-Rawi

doi:10.1117/12.920582

12 January 2012 Performance of asynchronous tandem standard 32 Kb/s ADPCM systems using QAM signal

Muhanned Farhan Abdul-Hameed AL-Rawi, Muaayed Farhan Abdul-Hameed AL-Rawi

Author Affiliations +

Proceedings Volume 8350, Fourth International Conference on Machine Vision (ICMV 2011): Computer Vision and Image Analysis; Pattern Recognition and Basic Technologies; 83500M (2012) https://doi.org/10.1117/12.920582
Event: Fourth International Conference on Machine Vision (ICMV 11), 2011, Singapore, Singapore

Abstract

This paper deals with the performance of standard 32 kb/s ADPCM. This performance is measured using signal-tonoise ratio (SNR). Here, the new contribution is related with mathematical derivation of SNR for asynchronous tandem ADPCM systems as given in section 5. Another contribution is study this performance using QAM modem signal with different constellations. A computer simulation program has been developed and a number of simulation tests have been carried out using QAM modem signal at 9.6 Kb/s with four types of constellations, rectangular, and (5,11), (4,12), (8,8) circular. The results of testing asynchronous tandem ADPCM systems show that the performance degrades with increasing the stages of ADPCM. Also, the results show that the performance with circular constellation is better than rectangular constellation.

Citation Download Citation

Muhanned Farhan Abdul-Hameed AL-Rawi and Muaayed Farhan Abdul-Hameed AL-Rawi "Performance of asynchronous tandem standard 32 Kb/s ADPCM systems using QAM signal", Proc. SPIE 8350, Fourth International Conference on Machine Vision (ICMV 2011): Computer Vision and Image Analysis; Pattern Recognition and Basic Technologies, 83500M (12 January 2012); https://doi.org/10.1117/12.920582

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