Data detection and demodulation for wireless communication systems
First Claim
1. A receiver unit in a wireless communication system, comprising:
- a demodulator operative to process received data symbols to provide recovered symbols;
a first data processor operative to process the recovered symbols to provide decoded data;
a second data processor operative to process the decoded data to provide remodulated symbols; and
a detector operative to process the received data symbols and the remodulated symbols to provide a detector output, wherein the detector is further operative to process received pilot symbols to provide the detector output, wherein;
data symbols are transmitted on data subbands and pilot symbols are transmitted on pilot subbands, wherein the data subbands are interlaced with the pilot subbands such that each of the data subbands is flanked on both sides by pilot subbands; and
the data subbands are multiplexed with the pilot subbands.
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Abstract
Techniques for detecting and demodulating data transmissions in wireless communication systems are presented. In one aspect, a decision-directed detector detects for data transmissions in a received signal by utilizing received data symbols as well as received pilot symbols. The decision-directed detector may be designed to perform differential detection in the frequency domain or coherent detection in the time domain, and may be used with multi-carrier modulation (e.g., OFDM). In another aspect, an adaptive threshold is used to perform detection of received data transmissions. A threshold may be determined for each data transmission hypothesized to have been received. The threshold may be computed, for example, based on the signal plus noise energy of the hypothesized data transmission.
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Citations
28 Claims
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1. A receiver unit in a wireless communication system, comprising:
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a demodulator operative to process received data symbols to provide recovered symbols; a first data processor operative to process the recovered symbols to provide decoded data; a second data processor operative to process the decoded data to provide remodulated symbols; and a detector operative to process the received data symbols and the remodulated symbols to provide a detector output, wherein the detector is further operative to process received pilot symbols to provide the detector output, wherein; data symbols are transmitted on data subbands and pilot symbols are transmitted on pilot subbands, wherein the data subbands are interlaced with the pilot subbands such that each of the data subbands is flanked on both sides by pilot subbands; and the data subbands are multiplexed with the pilot subbands. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A receiver unit in a wireless communication system, comprising:
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a demodulator operative to process received data symbols to provide recovered symbols; a first data processor operative to process the recovered symbols to provide decoded data; a second data processor operative to process the decoded data to provide remodulated symbols; and a detector operative to process the received data symbols and the remodulated symbols to provide a detector output, wherein the detector is operative to process received pilot symbols to provide the detector output; multiply each of the received data symbols with a corresponding one of the remodulated symbols to provide a demodulated data symbol; multiply each of the received pilot symbols with a corresponding one of known pilot symbols to provide a demodulated pilot symbol; perform dot products between demodulated data symbols and demodulated pilot symbols; and accumulate results of the dot products.
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8. A method for receiving data in a wireless communication system, comprising:
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demodulating received data symbols to provide recovered symbols; processing the recovered symbols to provide decoded data; processing the decoded data to provide remodulated symbols; and detecting the received data symbols and the remodulated symbols to provide a detector output, wherein the detecting further comprises processing received pilot symbols to provide the detector output, wherein; data symbols are transmitted on data subbands and pilot symbols are transmitted on pilot subbands, wherein the data subbands are interlaced with the pilot subbands such that each of the data subbands is flanked on both sides by pilot subbands; and the data subbands are multiplexed with the pilot subbands. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for receiving data in a wireless communication system, comprising:
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demodulating received data symbols to provide recovered symbols; processing the recovered symbols to provide decoded data processing the decoded data to provide remodulated symbols; and detecting the received data symbols and the remodulated symbols to provide a detector output, wherein the step of detecting includes; processing received pilot symbols to provide the detector output; multiplying each of the received data symbols with a corresponding one of the remodulated symbols to provide a demodulated data symbol; multiplying each of the received pilot symbols with a corresponding one of known pilot symbols to provide a demodulated pilot symbol; performing dot products between demodulated data symbols and demodulated pilot symbols; and accumulating results of the dot products.
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15. An apparatus for receiving data in a wireless communication system, comprising:
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means for demodulating received data symbols to provide recovered symbols; means for processing the recovered symbols to provide decoded data; means for processing the decoded data to provide remodulated symbols; and means for detecting the received data symbols and the remodulated symbols to provide a detector output, wherein the means for detecting comprises means for processing received pilot symbols to provide the detector output, wherein; data symbols are transmitted on data subbands and pilot symbols are transmitted on pilot subbands, wherein the data subbands are interlaced with the pilot subbands such that each of the data subbands is flanked on both sides by pilot subbands; and the data subbands are multiplexed with the pilot subbands. - View Dependent Claims (16, 17, 18, 19, 20)
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21. An apparatus for receiving data in a wireless communication system, comprising:
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means for demodulating received data symbols to provide recovered symbols; means for processing the recovered symbols to provide decoded data; means for processing the decoded data to provide remodulated symbols; and means for detecting the received data symbols and the remodulated symbols to provide a detector output, wherein the means for detecting includes; means for processing received pilot symbols to provide the detector output; means for multiplying each of the received data symbols with a corresponding one of the remodulated symbols to provide a demodulated data symbol; means for multiplying each of the received pilot symbols with a cooresponding one of known pilot symbols to provide a demodulated pilot symbol; means for performing dot products between demodulated data symbols and demodulated pilot symbols; and means for accumulating results of the dot products.
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22. A computer-program apparatus for receiving data in a wireless communication system comprising at last one memory unit having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:
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instructions for demodulating received data symbols to provide recovered symbols; instructions for processing the recovered symbols to provide decoded data; instructions for processing the decoded data to provide remodulated symbols; and instructions for detecting the received data symbols and the remodulated symbols to provide a detector output, wherein the instructions for detecting comprise instructions for processing received pilot symbols to provide the detector output, wherein; data symbols are transmitted on data subbands and pilot symbols are transmitted on pilot subbands, wherein the data subbands are interlaced with the pilot subbands such that each of the data subbands is flanked on both sides by pilot subbands; and the data subbands are multiplexed with the pilot subbands. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A computer-program apparatus for receiving data in a wireless communication system comprising at last one memory unit having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:
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instructions for demodulating received data symbols to provide recovered symbols; instructions for processing the recovered symbols to provide decoded data instructions for processing the decoded data to provide remodulated symbols; and instructions for detecting the received data symbols and the remodulated symbols to provide a detector output, wherein the instructions for detecting includes; instructions for processing received pilot symbols to provide the detector output; instructions for multiplying each of the received data symbols with a corresponding one of the remodulated symbols to provide a demodulated data symbol; instructions for multiplying each of the received pilot symbols with a corresponding one of known pilot symbols to provide a demodulated pilot symbol; instructions for performing dot products between demodulated data symbols and demodulated pilot symbols; and instructions for accumulating results of the dot products.
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Specification