Apparatus and method for allocating subchannel and power in an orthogonal frequency division multiple access system
AssigneeSamsung Electronics Co., Ltd.
InventorsKwang-Man Ok, Chung-Gu Kang, Min-Goo Kim, Wi-Sang Rho
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Abstract
An apparatus and method for allocating transmission power of a subchannel for each individual user in an orthogonal frequency division multiple access (OFDMA) system. The apparatus and method comprises determining the number-of-transmission bits per symbol approximating an estimated signal-to-interference ratio (SIR) for each of subchannels when transmission power is uniformly allocated to the subchannels; and calculating a required SIR corresponding to the number-of-transmission bits per symbol, and allocating transmission power to each of the subchannels according to the required SIR.
Claims23
A method for allocating transmission power of a subchannel for each individual user by a base station in an orthogonal frequency division multiple access (OFDMA) system, the method comprising the steps of:
- determining a required signal-to-interference (SIR) approximating an estimated SIR for each of subchannels when transmission power is uniformly allocated to the subchannels;
- and
- finding the number-of-transmission bits per symbol corresponding to the required SIR, and allocating transmission power to each of the subchannels such that the required SIR is satisfied.
A base station apparatus for allocating transmission power of a subchannel for each individual user in an orthogonal frequency division multiple access (OFDMA) system, the apparatus comprising:
- means for determining a required signal-to-interference ratio (SIR) approximating an estimated SIR for each of subchannels when transmission power is uniformly allocated to the subchannels;
- and
- means for finding the number-of-transmission bits per symbol corresponding to the required SIR, and allocating transmission power to each of the subchannels such that the required SIR is satisfied.
A method for allocating, by a base station, transmission power and a subchannel used by a mobile station of each user in a cell of an orthogonal frequency division multiple access (OFDMA) system that both a non-real-time data user and a real-time data user access, the method comprising:
- a first allocation step of sequentially allocating the subchannels having the highest measured signal-to-interference ratio (SIR) to each individual user, and allocating the transmission power to each individual user such that the number-of-transmission bits has a positive value;
- and
- a second allocation step of allocating the remaining subchannels to at least one non-real-time data user selected for every remaining subchannel left after the allocation in the order of the subchannel having the highest measured SIR.
A subchannel and power allocation apparatus in a base station, for allocating a subchannel and transmission power to a mobile station of each user in an orthogonal frequency division multiple access (OFDMA) system that both a non-real-time data user and a real-time data user access, the apparatus comprising:
- a first allocator for sequentially allocating the subchannels having the highest measured signal-to-interference ratio (SIR) to each individual user, and allocating the transmission power to each individual user such that the number-of-transmission bits has a positive value;
- and
- a second allocator for allocating the remaining subchannels to at least one non-real-time data user selected for every remaining subchannel left after the allocation in the order of the subchannel having the highest measured SIR.
A base station apparatus for allocating a subchannel and transmission power to a mobile station of each user in an uplink of an orthogonal frequency division multiple access (OFDMA) system that both a non-real-time data user and a real-time data user access, the apparatus comprising:
- a subchannel and power allocator for sequentially allocating the subchannels having the highest measured signal-to-interference ratio (SIR) to each individual user, allocating the transmission power to each individual user such that the number-of-transmission bits has a positive value, allocating the remaining subchannels to at least one non-real-time data user selected for every remaining subchannel left after the allocation in the order of the subchannel having the highest measured SIR, and outputting the allocation result;
- an adaptive demodulator for demodulating received data on each subchannel with a demodulation method corresponding to the transmission power and the number-of-transmission bits based on the allocation result of the subchannel and power allocator;
- and
- a bit extractor for extracting data bits demodulated by the adaptive demodulator.
Dependencies are inferred from the claim text.