Channel estimates in a SIC receiver for a multi-transmitter array transmission scheme
First Claim
1. A method, comprising:
- in a first stage of a receiver, equalizing signals received on at least two receive antenna ports using first stage channel estimates and separating a first stream of data from a second stream of data;
generating interference on the first stream of data by decoding the first stream of data and filtering the decoded first stream of data using the first stage channel estimates;
calculating second stage channel estimates using the first stage channel estimates and gain derived from generating the interference;
subtracting the interference from the signals received on the at least two receive antenna ports;
in a second stage of the receiver, equalizing the signals from which the interference was subtracted using the second stage channel estimates and decoding the second stream of data; and
outputting the decoded first stream of data and the decoded second stream of data.
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Accused Products
Abstract
In a receiver first stage, received signals are equalized using first stage channel estimates, a first data stream is separated from a second data stream; and interference on the first data stream is re-generated by filtering the decoded first data stream (after decoding) using the first stage channel estimates. Second stage channel estimates are calculated using the first stage channel estimates and gain derived from generating the interference, and the interference is subtracted from the received signals. In the receiver second stage, the signals from which the interference was subtracted are equalized using the second stage channel estimates, the second stream of data is decoded; and the decoded first data stream and the decoded second data stream are output. One embodiment gets channel estimates for each stage from the received signal and regenerates pilot interference; the other calculates updated channel estimates from the first stage for use in the second stage.
76 Citations
21 Claims
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1. A method, comprising:
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in a first stage of a receiver, equalizing signals received on at least two receive antenna ports using first stage channel estimates and separating a first stream of data from a second stream of data; generating interference on the first stream of data by decoding the first stream of data and filtering the decoded first stream of data using the first stage channel estimates; calculating second stage channel estimates using the first stage channel estimates and gain derived from generating the interference; subtracting the interference from the signals received on the at least two receive antenna ports; in a second stage of the receiver, equalizing the signals from which the interference was subtracted using the second stage channel estimates and decoding the second stream of data; and outputting the decoded first stream of data and the decoded second stream of data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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at least two receive antenna ports; a first stage channel estimator having inputs coupled to at least two receive antenna ports; a first stage equalizer having inputs coupled to outputs of the first stage channel estimator and to the at least two receive antenna ports and configured to equalize signals input from the at least two receive antenna ports using first stage channel estimates provided by the first stage channel estimator; a first stage post-processing block having inputs coupled to outputs of the first stage equalizer, and configured to separate a first stream of data from a second stream of data; a data interference regeneration block configured to generate interference on the first stream of data by filtering the first stream of data, after decoding, using the first stage channel estimates; a second stage channel estimator configured to calculate second stage channel estimates using the first stage channel estimates and a gain derived from the generated interference; summing junctions configured to subtract the interference from the signals output from the at least two receive antenna ports; a second stage equalizer configured to equalize the signals output from the summing junctions using the second stage channel estimates and decoding the second stream of data; and output ports configured to output the first stream of data after decoding and to output the second stream of data after decoding. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A memory storing a program of machine readable instructions that when executed by a processor result in actions comprising:
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equalizing signals received on at least two receive antenna ports using first stage channel estimates and separating a first stream of data from a second stream of data; generating interference on the first stream of data by decoding the first stream of data and filtering the decoded first stream of data using the first stage channel estimates; calculating second stage channel estimates using the first stage channel estimates and gain derived from generating the interference; subtracting the interference from the signals received on the at least two receive antenna ports; equalizing the signals from which the interference was subtracted using the second stage channel estimates and decoding the second stream of data; and outputting the decoded first stream of data and the decoded second stream of data. - View Dependent Claims (16, 17, 18, 19, 20)
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21-26. -26. (canceled)
Specification