Two approaches for waveform coding of 9.6 kbit/s voiceband data signals through 32 kbit/s ADPCM

Benvenuto, N.; Daumer, W.

doi:10.1109/26.1465

Cited by 8 publications

(3 citation statements)

References 2 publications

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“…Exhaustive work had been done to accommodate high speed voiceband data signal either by modifying the algorithm of ADPCM [3],[4], [6], [7], [9], [10], [17], [18], [21], [29] or by modifying the model of data transmission [16], [18], [19], [20]. One way to modify the model of data transmission is to use different constellations of Quadrature Amplitude Modulation (QAM) signal.…”

Section: Methodology Of Solutionmentioning

confidence: 99%

Data Transmission at 16.8kb/s Over 32kb/s ADPCM Channel

AL-Rawi¹

2012

IOSRJEN

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This paper presents three models of Quadrature Amplitude Modulation (QAM) modem operating at data rate of 16.8kb/s to be transmitted over 32kb/s Adaptive Differential Pulse Code Modulation (ADPCM) channel. These modems operate at symbol rates of 2400, 2800, and 3360 baud with associated number of bits per symbol of 7, 6, and 5 respectively. The performance of ADPCM is studied considering these modems with different constellations. The simulation results show that the performance of ADPCM degrades as the symbol rate decreases or number of bits per symbol increases. Also, the performance with circular constellation is better than rectangular one.

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Section: Methodology Of Solutionmentioning

confidence: 99%

Data Transmission at 16.8kb/s Over 32kb/s ADPCM Channel

AL-Rawi¹

2012

IOSRJEN

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“…This problem can be solved either by modifying the algorithm of ADPCM [15][16][17][18][19][20][21], or by modifying the model of data transmission system [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Comparative study of 24 kb/s ADPCM algorithms

AL-Rawi

2014

Radioelectron.Commun.Syst.

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The paper is devoted to comparison of four algorithms of 24 kb/s ADPCM, standard ADPCM (ADPCM-1), and three new modified algorithms (ADPCM-2, ADPCM-3, ADPCM-4). The purpose of the modified algorithms is to reduce the nonlinear distortion introduced by ADPCM when high data rate signal passes through it. The performances of the four algorithms are researched using QAM signal at data rate of 9.6kb/s. The simulation results show that the performance of ADPCM-4 is better than that of ADPCM-3, and the performance of ADPCM-3 is better than that of ADPCM-2, and the performance of ADPCM-2 is better than that of ADPCM-1.

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“…Step-size adaptation Adaptive predictor Exhaustive work had been done to accommodate high speed voiceband data signal either by modifying the algorithm of ADPCM [15][16][17][18][19][20][21][22][23][24][25] or by modifying the model of data transmission [22,[26][27]. One way of modifying the model of data transmission is to use different constellations of Quadrature Amplitude Modulation (QAM) signal.…”

Section: Qam Modemmentioning

confidence: 99%