摘要:
Disclosed is an apparatus and a method for effectively allocating frequency resources in a mobile communication system. The method includes: determining a first offset of a preset frequency band from among all frequency bands, determining a second offset corresponding to a symbol unit in the preset frequency band, and allocating frequency resources to data, the frequency resources corresponding to a sum of the first offset and the second offset.
摘要:
An apparatus and method for estimating a frequency offset using a preamble signal having a periodically repeated structure. According to the apparatus and method, the sum of or the difference between an input signal and a delay signal is calculated without obtaining a simple correlation value between the input signal and the delay signal, and then a correlation value between a calculated signal and the delay signal is obtained. Accordingly, the implementation complexity of the circuit and the power consumption are reduced, and thus, the battery cycle of a terminal provided with the frequency offset estimating circuit can be increased.
摘要:
A scheduling method is provided for processing data in a communication system. The method includes performing downlink MAP (DL-MAP) decoding; generating a configuration table through the DL-MAP decoding; and processing data in a predetermined unit according to the generated configuration table.
摘要:
Provided is a channel estimation apparatus and method. In the channel estimation apparatus, a channel estimator performs channel estimation onto a received symbol and output a channel estimation result. The channel estimation result is stored in an estimation buffer along with a channel estimation result compensated in a preamble phase compensator. The preamble phase compensator receives a channel estimation result for pilot subcarriers of a data symbol and a preamble channel estimation result from the estimation buffer, acquires a phase rotation value between them, and compensates the preamble channel estimation result with the phase rotation value. When FCH and DL-MAP are demodulated, pilot subcarriers in the Nth PUSC symbol have been used to estimate the channel of the Nth PUSC symbol.
摘要:
Disclosed is an apparatus and a method for performing a cell search in a wireless communication system. A subscriber station calculates the power of subcarriers according to their positions in a preamble signal of a frequency domain and identifies a segment of a cell to which the subscriber station belongs. Then, the subscriber station correlates PN sequences, which correspond to the segment of the cell that has been identified, with the preamble signal of the frequency domain. Therefore, the number of calculations for determining correlation values in a cell search is remarkably reduced.
摘要:
Provided is an apparatus and method for receiving a signal in communication system. The apparatus and method includes generating a particular log-likelihood ratio (LLR) value by demapping an input signal according to a particular demapping scheme among a plurality of demapping schemes; performing a control operation of buffering the particular LLR value in a particular LLR sub-buffer for buffering an LLR value generated according to the particular demapping scheme among the plurality of LLR sub-buffers for buffering an LLR value generated according to each of the plurality of demapping schemes; and performing a control operation of reading an LLR value buffered in an LLR buffer including the plurality of LLR sub-buffers.
摘要:
Provided is a channel estimation apparatus and method. In the channel estimation apparatus, a channel estimator performs channel estimation onto a received symbol and output a channel estimation result. The channel estimation result is stored in an estimation buffer along with a channel estimation result compensated in a preamble phase compensator. The preamble phase compensator receives a channel estimation result for pilot subcarriers of a data symbol and a preamble channel estimation result from the estimation buffer, acquires a phase rotation value between them, and compensates the preamble channel estimation result with the phase rotation value. When FCH and DL-MAP are demodulated, pilot subcarriers in the Nth PUSC symbol have been used to estimate the channel of the Nth PUSC symbol.
摘要:
A scheduling method is provided for processing data in a communication system. The method includes performing downlink MAP (DL-MAP) decoding; generating a configuration table through the DL-MAP decoding; and processing data in a predetermined unit according to the generated configuration table.
摘要:
In an orthogonal frequency division multiplexing (OFDM) system, channel estimates of pilot subcarriers in a current input symbol are input, and time domain channel estimation for data subcarriers positioned between adjacent pilot subcarriers is performed by linear interpolating channel estimates of the adjacent pilot subcarriers associated with each of the pilot subcarriers in the current input symbol during a time interval of the current input symbol.
摘要:
An apparatus and a method for estimating a carrier to interference and noise ratio (CINR) in a communication system. The CINR value is precisely estimated by removing the error floor value, which is caused by the inaccurate sliding average window SAW channel estimation value, from the CINR estimation value. Since the CINR value is precisely estimated, performance of the adaptive power control or the adaptive modulation and coding device is improved.