scholarly journals Data Transmission at 14.4kb/s OVER 32kb/s ADPCM Channel

2018 ◽  
Vol 15 (2) ◽  
pp. 27-30
Author(s):  
Muhanned AL-Rawi
Keyword(s):  
Data Transmission ◽  
Nonlinear Distortion ◽  
Differential Pulse ◽  
Data Rate ◽  
Pulse Code Modulation ◽  
Differential Pulse Code Modulation ◽  
Code Modulation ◽  
Simulation Results ◽  
Better Than

Abstract This paper presents new modified QAM modem that operates at data rate of 14.4kb/s to be transmitted over 32kb/s Adaptive Differential Pulse Code Modulation (ADPCM). The purpose of this modified QAM modem is to reduce the nonlinear distortion introduced by ADPCM. The performance of ADPCM is studied considering the standard QAM modem and modified QAM modem with different constellations. The simulation results show that the performance of ADPCM with modified QAM modem is better than its performance with standard QAM modem. Also, the performance with circular constellation is better than rectangular one.

Performance study of multistage of 40 kb/s ADPCM systems

2015 ◽  
Vol 6 (2) ◽  
pp. 85-88
Author(s):  
M. Al-Rawi
Keyword(s):  
Signal To Noise Ratio ◽  
Differential Pulse ◽  
Data Rate ◽  
Performance Study ◽  
Pulse Code Modulation ◽  
Signal To Noise ◽  
Differential Pulse Code Modulation ◽  
Code Modulation ◽  
Simulation Results ◽  
Better Than

The contribution of this paper is that the measure of the performance of multistage of 40 kb/s Adaptive Differential Pulse Code Modulation (ADPCM) using signal-to-noise-ratio formula previously derived by AL-Rawi. The multistage performance is tested using QAM signal at data rate of 9.6 kb/s with four types of constellations, rectangular, and (5,11), (4,12), (8,8) circular. The simulation results show that the performance degrades with increasing the number of stages of ADPCM. Also, the performance with circular constellation is better than that with rectangular one.

Entropy-coded hybrid differential pulse-code modulation

1983 ◽  
Vol 19 (2) ◽  
pp. 63 ◽  
Author(s):  
N.M. Nasrabadi ◽  
S.K. Pal ◽  
R.A. King
Keyword(s):  
Differential Pulse ◽  
Pulse Code Modulation ◽  
Differential Pulse Code Modulation ◽  
Code Modulation

scholarly journals Digital mobile fronthaul employing differential pulse code modulation with suppressed quantization noise

2017 ◽  
Vol 25 (25) ◽  
pp. 31921 ◽  
Author(s):  
Lu Zhang ◽  
Xiaodan Pang ◽  
Oskars Ozolins ◽  
Aleksejs Udalcovs ◽  
Richard Schatz ◽  
...  
Keyword(s):  
Differential Pulse ◽  
Quantization Noise ◽  
Pulse Code Modulation ◽  
Differential Pulse Code Modulation ◽  
Code Modulation
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