Multiuser detection for wireless communications systems in the presence of interference
First Claim
1. A method for extracting information transmitted by a desired user in a communications system from a received signal in the presence of interferers comprising:
- derotating the received signal;
determining channel estimates and detecting the presence of interferers; and
extracting information transmitted by the desired user from the received signal.
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Abstract
System and method for detecting transmissions from multiple users in a digital wireless communications system in the presence of interference. A preferred embodiment comprises derotating a received signal by a specified amount, determining channel estimates, which can include the determination of the number of users (interferers plus a desired user), and extracting information transmitted by the desired user from the received signal. Successive and parallel multiuser detection schemes are provided for extracting the information from the received signal.
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Citations
32 Claims
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1. A method for extracting information transmitted by a desired user in a communications system from a received signal in the presence of interferers comprising:
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derotating the received signal;
determining channel estimates and detecting the presence of interferers; and
extracting information transmitted by the desired user from the received signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A receiver comprising:
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a sampling unit coupled to a signal input, the sampling unit containing circuitry to sample a received signal provided by the signal input at a specified sampling rate;
a channel estimation unit coupled to the sampling unit, the channel estimation unit containing circuitry to determine a number of users present in the received signal and to compute channel estimates for each user; and
a multiuser detection unit coupled to the channel estimation unit, the multiuser detection unit containing circuitry to extract information transmitted by a desired user from the received signal. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification