Companded PCM Weighted QAM Transmission with the Erasure Zone

Seung Choon AHN; Moon Ho LEE

Companded PCM Weighted QAM Transmission with the Erasure Zone

Seung Choon AHN, Moon Ho LEE

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The transmission of 8-bit µ-law PCM signals using 16-level weighted QAM over Gaussian channels is examined. The weighting process modifies the positions of the QAM constellation points so that the overall distortion in the recovered information-bearing source signal is reduced. The PCM bits are mapped to the weighted QAM points such that the most significant bits have a lower probability of being in error than the least significant bits. The weighted QAM systems have been optimized for the same energy signal energy per transmitted symbol as for unweighted QAM. Also, the erasure zone is established at the detector, such that if the output falls into the erasure zone, the regenerated sample is replaced by interpolation. The theoretical results indicates that 16-level weighted QAM have a gain of 5dB over unweighted QAM.

Publication: IEICE TRANSACTIONS on Communications Vol.E75-B No.8 pp.733-738

Publication Date: 1992/08/25

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Type of Manuscript: Special Section PAPER (Special Issue on the 4th Japan-Korea Joint Conference on Communications, Networks, Switching Systems and Satellite Communications (4th JC-CNSS))

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Seung Choon AHN, Moon Ho LEE, "Companded PCM Weighted QAM Transmission with the Erasure Zone" in IEICE TRANSACTIONS on Communications, vol. E75-B, no. 8, pp. 733-738, August 1992, doi: .
Abstract: The transmission of 8-bit µ-law PCM signals using 16-level weighted QAM over Gaussian channels is examined. The weighting process modifies the positions of the QAM constellation points so that the overall distortion in the recovered information-bearing source signal is reduced. The PCM bits are mapped to the weighted QAM points such that the most significant bits have a lower probability of being in error than the least significant bits. The weighted QAM systems have been optimized for the same energy signal energy per transmitted symbol as for unweighted QAM. Also, the erasure zone is established at the detector, such that if the output falls into the erasure zone, the regenerated sample is replaced by interpolation. The theoretical results indicates that 16-level weighted QAM have a gain of 5dB over unweighted QAM.
URL: https://global.ieice.org/en_transactions/communications/10.1587/e75-b_8_733/_p

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@ARTICLE{e75-b_8_733,
author={Seung Choon AHN, Moon Ho LEE, },
journal={IEICE TRANSACTIONS on Communications},
title={Companded PCM Weighted QAM Transmission with the Erasure Zone},
year={1992},
volume={E75-B},
number={8},
pages={733-738},
abstract={The transmission of 8-bit µ-law PCM signals using 16-level weighted QAM over Gaussian channels is examined. The weighting process modifies the positions of the QAM constellation points so that the overall distortion in the recovered information-bearing source signal is reduced. The PCM bits are mapped to the weighted QAM points such that the most significant bits have a lower probability of being in error than the least significant bits. The weighted QAM systems have been optimized for the same energy signal energy per transmitted symbol as for unweighted QAM. Also, the erasure zone is established at the detector, such that if the output falls into the erasure zone, the regenerated sample is replaced by interpolation. The theoretical results indicates that 16-level weighted QAM have a gain of 5dB over unweighted QAM.},
keywords={},
doi={},
ISSN={},
month={August},}

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TY - JOUR
TI - Companded PCM Weighted QAM Transmission with the Erasure Zone
T2 - IEICE TRANSACTIONS on Communications
SP - 733
EP - 738
AU - Seung Choon AHN
AU - Moon Ho LEE
PY - 1992
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E75-B
IS - 8
JA - IEICE TRANSACTIONS on Communications
Y1 - August 1992
AB - The transmission of 8-bit µ-law PCM signals using 16-level weighted QAM over Gaussian channels is examined. The weighting process modifies the positions of the QAM constellation points so that the overall distortion in the recovered information-bearing source signal is reduced. The PCM bits are mapped to the weighted QAM points such that the most significant bits have a lower probability of being in error than the least significant bits. The weighted QAM systems have been optimized for the same energy signal energy per transmitted symbol as for unweighted QAM. Also, the erasure zone is established at the detector, such that if the output falls into the erasure zone, the regenerated sample is replaced by interpolation. The theoretical results indicates that 16-level weighted QAM have a gain of 5dB over unweighted QAM.
ER -