Receiving apparatus and method in broadband wireless access system
AssigneeSamsung Electronics Co., Ltd.
InventorsChung-Ryul Chang, Keun-Chul Hwang, June Moon, Sung-Ho Lee, In-Seok Hwang, Sung-Woo Park, Jang-Hoon Yang
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Abstract
Provided is an apparatus and method for enhancing a demodulation performance of a receiver in a Broadband Wireless Access (BWA) system. A receiving apparatus in a broadband wireless communication system includes an estimator, a first calculator, and a second calculator. The estimator estimates a desired signal. The first calculator calculates a correlation matrix of a signal obtained by eliminating the estimated desired signal from a Received (RX) signal. The second calculator performs an interference elimination using the correlation matrix.
Claims42
A receiving apparatus in a wireless communication system, the receiving apparatus comprising:
- an estimator for estimating a desired signal;
- a first calculator for calculating a correlation matrix of a signal obtained by eliminating the estimated desired signal from a Received (RX) signal;
- a second calculator for performing an interference elimination using the correlation matrix;
- and
- a noise estimator for estimating a narrowband noise using at least one of the correlation matrix and a filter coefficient,
- wherein the second calculator comprises:
- a filter coefficient calculator for calculating the filter coefficient using a channel coefficient of the desired signal and the correlation matrix;
- and
- an interference elimination filter for eliminating an interference signal from a data-tone RX signal using the filter coefficient.
A receiving apparatus in a wireless communication system, the receiving apparatus comprising:
- a first channel estimator for estimating a channel coefficient of a preamble signal;
- a second channel estimator for estimating a channel coefficient of a pilot signal received in a data field;
- an interference eliminator for calculating a correlation matrix by autocorrelating a signal obtained by subtracting the channel coefficient of the preamble signal or the channel coefficient of the pilot signal from a predetermined tone of a received signal, and performing a Minimum Mean Square Error (MMSE) based interference elimination on a data-tone received signal using the calculated correlation matrix;
- a noise estimator for estimating a narrowband noise using a filter coefficient of the interference eliminator, wherein the filter coefficient is calculated by the channel coefficient from the first channel estimator or the channel coefficient from the second channel estimator and the correlation matrix;
- and
- a Log Likelihood Ratio (LLR) calculator for generating LLRs by demodulating an interference-free signal from the interference eliminator using the narrowband noise.
A receiving method in a wireless communication system, the receiving method comprising the steps of:
- estimating a desired signal;
- calculating a first correlation matrix of a signal obtained by eliminating the estimated desired signal from a received signal;
- and
- performing an interference elimination using the first correlation matrix;
- and
- estimating a narrowband noise using the first correlation matrix and a filter coefficient,
- wherein the interference elimination comprises:
- calculating the filter coefficient using a channel coefficient of the desired signal and the first correlation matrix;
- and
- eliminating an interference signal from a data-tone Received (RX) signal using the filter coefficient.
A receiving method in a wireless communication system, the receiving method comprising the steps of:
- estimating a channel coefficient of a preamble signal;
- estimating a channel coefficient of a pilot signal received in a data field;
- calculating a correlation matrix by autocorrelating a signal obtained by subtracting the channel coefficient of the preamble signal or the channel coefficient of the pilot signal from a predetermined tone of a received signal;
- performing an Minimum Mean Square Error (MMSE)-based interference elimination on a data-tone received signal using the calculated correlation matrix;
- estimating a narrowband noise using a coefficient of an MMSE-based interference elimination, wherein the filter coefficient is calculated by the channel coefficient from the first channel estimator or the channel coefficient from the second channel estimator and the correlation matrix;
- and
- generating Log Likelihood Ratios (LLRs) by demodulating an interference-free signal resulting from the interference elimination step using the narrowband noise.
Dependencies are inferred from the claim text.