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[Communication] QAMTransmissionThroughaCompanding DL : 0: Abstract-The effect of the companding process on QAM signals has been under investigation for the past several years. The compander, included in the PCM telephone network to improve voice performance, has an unusual affect on digital QAM data signals which are transmitted over the same channel. The quantization noise, generated by the companding process which is multiplicative (and asymmetric), degrades the detectability performance of the outermost points of the QAM constellation more than that of the inner points. The combined effect of the companding noise and the inherent white gaussian noise of the system, leads us to a re-examination of signal constellation design. In this paper we investigate the detectability performance of a number of candidates for signal constellations including, a typical rectangular QAM constellation, the same constellation with the addition of a smear-desmear operation, and two new improved QAM constellation designs with two-dimensional warpi
Date : 2008-10-13 Size : 1.03mb User : 雨笑了
[Program doc] QAMTransmissionThroughaCompanding DL : 0: Abstract-The effect of the companding process on QAM signals has been under investigation for the past several years. The compander, included in the PCM telephone network to improve voice performance, has an unusual affect on digital QAM data signals which are transmitted over the same channel. The quantization noise, generated by the companding process which is multiplicative (and asymmetric), degrades the detectability performance of the outermost points of the QAM constellation more than that of the inner points. The combined effect of the companding noise and the inherent white gaussian noise of the system, leads us to a re-examination of signal constellation design. In this paper we investigate the detectability performance of a number of candidates for signal constellations including, a typical rectangular QAM constellation, the same constellation with the addition of a smear-desmear operation, and two new improved QAM constellation designs with two-dimensional warpi
Date : 2025-07-01 Size : 1.03mb User : 雨笑了
[Windows Develop] expirament_4 DL : 0: the pakage simulate a_law and mu_law compander
Date : 2025-07-01 Size : 56kb User : tau
[Program doc] aaaa DL : 0: A new scheme based on -law compander where the optimum value of is calculated
Date : 2025-07-01 Size : 251kb User : sakran
[Communication-Mobile] WiMAX DL : 0: The compander useslaw compression and expansion at the transmitter and receiver, respectively.
Date : 2025-07-01 Size : 140kb User : sakran