Spacetime equalization in a wireless receiver
View Patent ↗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.
1. 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 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.
2. The wireless receiver of claim 1 , wherein the two or more input signals received is different than the number of filtered signals output.
3. The wireless receiver of claim 1 , further comprising a Barker demodulator.
4. The wireless receiver of claim 1 , further comprising a complimentary code keying demodulator.
5. The wireless receiver of claim 1 , further comprising a decision feedback equalizer.
6. 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 signals, wherein the whitened matched filter operates on the two or more input signals according to a channel matched filter and a whitening filter;
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; and
an SbS MDR matched filter, matched to a response of the whitened matched filter and the wireless channel, wherein the SbS MDR matched filter and the whitening filter are implemented as a combined filter.
7. The wireless receiver of claim 6 , wherein the two or more input signals received is different than the number of filtered signals output.
8. The wireless receiver of claim 6 , further comprising a Barker demodulator.
9. The wireless receiver of claim 6 , further comprising a complimentary code keying demodulator.
10. The wireless receiver of claim 6 , further comprising a decision feedback equalizer.
11. 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 signals, wherein the whitened matched filter operates on the two or more input signals according to a channel matched filter and a whitening filter;
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; and
an SbS MDR matched filter, matched to a response of the whitened matched filter and the wireless channel, wherein the SbS MDR matched filter and the feedback filter are implemented as a combined filter.
12. The wireless receiver of claim 11 , wherein the two or more input signals received is different than the number of filtered signals output.
13. The wireless receiver of claim 11 , further comprising a Barker demodulator.
14. The wireless receiver of claim 11 , further comprising a complimentary code keying demodulator.
15. The wireless receiver of claim 11 , further comprising a decision feedback equalizer.
16. 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 signals, wherein the whitened matched filter operates on the two or more input signals according to a channel matched filter and a whitening filter;
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;
an SbS MDR matched filter, matched to a response of the whitened matched filter and the wireless channel;
a correlator; and
a slicer,
wherein corrections are performed prior to slicing.
17. The wireless receiver of claim 16 , comprising a combined filter implementing the SbS MDR matched filter and the whitening filter.
18. The wireless receiver of claim 16 , comprising a combined filter implementing the SbS MDR matched filter and a feedback filter.
19. The wireless receiver of claim 16 , wherein the two or more input signals received is different than the number of filtered signals output.
20. The wireless receiver of claim 16 , further comprising a Barker demodulator.
21. The wireless receiver of claim 16 , further comprising a complimentary code keying demodulator.
22. The wireless receiver of claim 16 , further comprising a decision feedback equalizer.