Adaptive power allocating method and apparatus for multicarrier transmission system
First Claim
1. An adaptive power allocating method for a multicarrier transmission system in which an original data signal is transmitted with a predetermined transmission power, said data signal distorted by a noise signal during transmission is received, and the received signal is output after being restored to said original data signal, comprising the steps of:
- (a) calculating an SNR for each subchannel;
(b) determining the transmission power value for each subchannel, so that a higher power value is allocated to a subchannel having a higher SNR, and a lower power value is allocated to a subchannel having a lower SNR;
(c) judging whether said transmission power value of each subchannel exceeds a maximum transmission power limit;
(d) redetermining said maximum transmission power limit as the transmission power of the subchannels whose transmission power exceeds said maximum transmission power limit if said step (c) is satisfied;
(e) redetermining the transmission power of a subchannel whose SNR is negative, if said step (c) is not satisfied or said step (d) is completed; and
(f) changing the transmission power of each subchannel into the power determined at said steps (b), (d) and (e).
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Accused Products
Abstract
An original data signal is transmitted by a predetermined transmission power, the data signal distorted during transmission is received, and the received signal is output after being restored to the original data signal, the SNR for each subchannel is calculated and a higher power is allocated to a subchannel having a higher SNR and a lower power is allocated to a subchannel having a lower SNR. If the transmission power of each subchannel exceeds a maximum limit, the maximum limit is redetermined as the transmission power of the subchannels whose transmission power exceeds the maximum limit. Then, the transmission power of a subchannel whose SNR is negative is determined if the transmission power of each subchannel does not exceed the maximum limit or the above redetermination step is completed. Thereafter, the transmission power of each subchannel is controlled to the determined power. As a result, the data transmission efficiency is increased and the power is not allocated near the subchannel having negative SNR value, to thereby prevent power loss.
172 Citations
11 Claims
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1. An adaptive power allocating method for a multicarrier transmission system in which an original data signal is transmitted with a predetermined transmission power, said data signal distorted by a noise signal during transmission is received, and the received signal is output after being restored to said original data signal, comprising the steps of:
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(a) calculating an SNR for each subchannel; (b) determining the transmission power value for each subchannel, so that a higher power value is allocated to a subchannel having a higher SNR, and a lower power value is allocated to a subchannel having a lower SNR; (c) judging whether said transmission power value of each subchannel exceeds a maximum transmission power limit; (d) redetermining said maximum transmission power limit as the transmission power of the subchannels whose transmission power exceeds said maximum transmission power limit if said step (c) is satisfied; (e) redetermining the transmission power of a subchannel whose SNR is negative, if said step (c) is not satisfied or said step (d) is completed; and (f) changing the transmission power of each subchannel into the power determined at said steps (b), (d) and (e). - View Dependent Claims (2, 3, 4)
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5. An adaptive power allocating apparatus for a multicarrier transmission system comprising:
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carrier transmission means for transmitting an original data signal with a transmission power determined in response to a control signal, receiving said data signal distorted by a noise signal during transmission, and restoring the received data signal to said original data signal to output said restored data signal; and power controlling means for determining the transmission power for each subchannel based on an SNR value of said distorted data signal, and outputting said control signal for controlling said data signal in order to be transmitted using said determined transmission power, such that more data is assigned to a subchannel of a frequency region having a higher SNR value as compared to a subchannel of another frequency region having a lower SNR value. - View Dependent Claims (6)
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7. An adaptive power allocating apparatus for a multicarrier transmission system comprising:
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carrier transmission processing means for determining a transmission power for each subchannel according to information amount in an original data signal based on an SNR value of a feedback data signal, processing the original data signal, and outputting said processed data signal for transmission via a transmission channel with said determined transmission power; and carrier reception means for restoring said original data signal by processing the data signal which is output from said carrier transmission processing means, and which is partially lost and/or distorted by noise during transmission via said transmission channel, and outputting the restored data signal and the feedback data signal wherein more data is assigned to a subchannel of a frequency region having a higher SNR value as compared to a subchannel of another frequency region having a lower SNR value. - View Dependent Claims (8)
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9. An adaptive power allocating apparatus for a multicarrier transmission system comprising:
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carrier transmission means for receiving and processing an original data signal, and outputting the data signal to be transmitted via a transmission channel with a transmission power determined in response to a control signal; and carrier reception processing means for receiving and processing the data signal which is partially lost and distorted by noise via said transmission channel during transmission to be restored, outputting the restored data signal and calculating an SNR value of said distorted and partially lost data signal, and outputting said control signal by determining said transmission power according to the information amount of said distorted and partially lost data signal wherein more data is assigned to a subchannel of a frequency region having a higher SNR value as compared to a subchannel of another frequency region having a lower SNR value. - View Dependent Claims (10, 11)
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Specification