Data detection and demodulation for wireless communication systems
First Claim
1. A receiver unit in a wireless communication system, comprising:
- 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 based on 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.
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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.
401 Citations
27 Claims
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1. 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 based on 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 (2, 3, 4, 5)
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6. 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; 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; and determining a threshold to use for the hypothesized data transmission, and wherein the detector output is further determined based on the threshold, wherein the second processing includes determining a metric based on the received data symbols and the remodulated symbols, and comparing the metric against the threshold, and wherein the detector output is based on the comparing. - View Dependent Claims (7)
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8. 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. - View Dependent Claims (9, 10, 11, 12)
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13. 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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14. A memory unit having software codes stored thereon for performing a method of detecting data transmissions in a wireless multiple-access communication system, the method 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. - View Dependent Claims (15, 16, 17, 18)
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19. A memory unit having software codes stored thereon for performing a method of detecting data transmissions in a wireless multiple-access communication system, the method 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; 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; and determining a threshold to use for the hypothesized data transmission, and wherein the detector output is further determined based on the threshold, wherein the second processing includes; determining a metric based on the received data symbols and the remodulated symbols, and comparing the metric against the threshold, and wherein the detector output is based on the comparing. - View Dependent Claims (20)
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21. An apparatus, comprising:
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a processor capable of executing instructions for performing a method of detecting data transmissions in a wireless multiple-access communication system, the method comprising; 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; and a memory unit communicatively coupled to the processor having the instructions stored therein. - View Dependent Claims (22, 23, 24, 25)
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26. An apparatus, comprising:
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a processor capable of executing instructions for performing a method of detecting data transmissions in a wireless multiple-access communication system, the method comprising; 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; 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; and determining a threshold to use for the hypothesized data transmission, and wherein the detector output is further determined based on the threshold; wherein the second processing includes determining a metric based on the received data symbols and the remodulated symbols and comparing the metric against the threshold, and wherein the detector output is based on the comparing; and a memory unit communicatively coupled to the processor having the instructions stored therein. - View Dependent Claims (27)
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Specification