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US 7,127,013 B2Granted
Spacetime equalization in a wireless receiver
AssigneeAirgo Networks, Inc.
InventorsGregory Steele, Richard D. J. van Nee
Life of this patent
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Abstract
A wireless receiver receives signals at a plurality of antennas and the combined signal is compensated for channel distortion. In other aspects, a wireless receiver includes a minimum distance receiver applied to the output of a whitened-matched filter, which combines channel matched filtering and whitening, using one or more antennas.
Claims26
A wireless receiver for receiving data over a wireless channel, comprising:
- a plurality of antennas having signal diversity such that what is received from the wireless channel not identical at each of the plurality of antennas;
- digital signal processing logic for processing signals received by the plurality of antennas, wherein the signals are one or more of Barker modulated signals and complementary code keying (CCK) signals;
- demodulation logic in the digital signal processing logic that demodulates a set of signals from two or more of the plurality of antennas, including one or more of a Barker correlator and a CCK correlator corresponding to modulation of the set of signals;
- and
- distortion compensation in the digital signal processing logic that processes at least a portion of the set of signals received comprising portions from signals from at least two of the plurality of antennas to compensate for channel distortion.
2 more elements
A wireless receiver for receiving data over a wireless channel from a plurality of antennas, comprising:
- a whitened matched filter that receives two or more input signals received from the plurality of antennas and outputs a number of filtered signals including at least one combined filtered signal representing a whitened matched filtered signal with contribution from the two or more input sianals, wherein the whitened matched filter operates on the two or more input signals according to a channel matched filter and a whitening filter;
- and
- a symbol by symbol minimum distance receiver (SbS MDR) that receives the number of filtered signals from the whitened matched filter and outputs a resulting data stream, wherein the SbS MDR comprises:
- a) an SbS MIDR matched filter, matched to a response of the whitened matched filter and the wireless channel;
- b) a correlator;
- and
- c) a slicer.
4 more elements
A wireless receiver for receiving data over a wireless channel from a plurality of antennas, comprising:
- a whitened matched filter that receives two or more input sianals received from the plurality of antennas and outputs a number of filtered signals including at least one combined filtered signal representing a whitened matched filtered signal with contribution from the two or more input signals, wherein the whitened matched filter operates on the two or more input signals according to a channel matched filter and a whitening filter;
- and
- a symbol by symbol minimum distance receiver (SbS MDR) that receives the number of filtered signals from the whitened matched filter and outputs a resulting data stream, wherein the channel matched filter is implemented as a filter distinct from the SbS MDR matched filter and the whitening filter.
A wireless receiver for receiving data over a wireless channel, comprising:
- a channel matched filter;
- a first combined filter coupled with an input to receive an output of the channel matched filter, wherein the first combined filter operates according to a symbol by symbol minimum distance receiver (SbS MDR) matched filter and a whitening filter;
- a correlator, coupled to receive an output of the first combined filter added to a feedback signal;
- a slicer, coupled to receive an output of the correlator added to one or more weights;
- a second combined filter coupled to receive a slicer output, wherein the second combined filter outputs the feedback signal and operates according to the SbS MDR matched filter and a feedback filter;
- and
- a data output for outputting a resulting data stream from an output of the slicer.
4 more elements
A wireless receiver for receiving data over a wireless channel, comprising:
- a plurality of antennas for receiving a plurality of signals from the wireless channel;
- a symbol by symbol minimum distance receiver (SbS MDR);
- a first combined filter having a transfer function that is a combination of a channel matched filter and an SbS MDR matched filter, wherein the channel matched filter is matched to a channel response of the wireless channel and the SbS MDR matched filter is matched to the SbS MDR, the first combined filter coupled to provide one or more filtered outputs to the SbS MDR;
- and
- a second combined filter that combines a transfer function of the SbS MDR matched filter with a feedback filter that receives an output of the SbS MDR and feeds back a signal to be combined with the one or more filtered outputs at an input of the SbS MDR.
2 more elements
A wireless receiver for receiving data over a wireless channel, comprising:
- one or more antennas for receiving one or more signals from the wireless channel;
- a symbol by symbol minimum distance receiver (SbS MDR);
- a first combined filter having a transfer function that is a combination of a channel matched filter, a whitening filter and an SbS MDR matched filter, wherein the channel matched filter is matched to a channel response of the wireless channel and the SbS MDR matched filter is matched to the SbS MDR, the first combined filter coupled to provide one or more filtered outputs to the SbS MDR;
- and
- a second combined filter that combines a transfer function of the SbS MDR matched filter with a feedback filter that receives an output of the SbS MDR and feeds back a signal to be combined with the one or more filtered outputs at an input to the SbS of MDR.
2 more elements
Dependencies are inferred from the claim text.