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.
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Accused Products
Abstract
Techniques for detecting and demodulating data transmissions in wireless communication systems. 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
31 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A receiver unit in a wireless communication system, comprising:
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a processor operative to process received data symbols for a data transmission hypothesized to have been received and provide remodulated symbols that are estimates of transmitted data symbols; and
a detector operative to process the received data symbols and the remodulated symbols to provide a detector output that indicates whether or not the data transmission is deemed to have been received. - View Dependent Claims (17, 18)
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19. A receiver unit in a wireless communication system, comprising:
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a signal detector operative to determine a metric for a data transmission hypothesized to have been received;
a threshold computation unit operative to determine a threshold for the hypothesized data transmission; and
a comparator operative to receive the metric and the threshold and provide an output indicating whether or not the data transmission is deemed to have been received. - View Dependent Claims (20, 21, 22, 23)
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24. A method of detecting data transmissions in a wireless multiple-access communication system, comprising:
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first processing received data symbols for a data transmission hypothesized to have been received to provide remodulated symbols that are estimates of transmitted data symbols; and
second processing the received data symbols and the remodulated symbols to provide a detector output that indicates whether or not the data transmission is deemed to have been received. - View Dependent Claims (25, 26, 27)
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28. A method of detecting data transmissions in a wireless multiple-access communication system, comprising:
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determining a metric for a data transmission hypothesized to have been received;
determining a threshold for the hypothesized data transmission based on samples received for the hypothesized data transmission; and
comparing the metric against the threshold to provide an output indicating whether or not the data transmission is deemed to have been received.
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29. An apparatus in a wireless multiple-access communication system, comprising:
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means for processing received data symbols for a data transmission hypothesized to have been received to provide remodulated symbols that are estimates of transmitted data symbols; and
means for processing the received data symbols and the remodulated symbols to provide a detector output that indicates whether or not the data transmission is deemed to have been received. - View Dependent Claims (30)
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31. An apparatus in a wireless multiple-access communication system, comprising:
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means for determining a metric for a data transmission hypothesized to have been received;
means for determining a threshold for the hypothesized data transmission based on samples received for the hypothesized data transmission; and
means for comparing the metric against the threshold to provide an output indicating whether or not the data transmission is deemed to have been received.
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Specification