Method and system for combined polarimetric and coherent processing for a wireless system
First Claim
1. A system for demodulating polarimetrically diverse signals including a desired signal having a polarimetric characteristic, comprising:
- at least one antenna;
at least one receiver front end coupled to the at least one antenna;
a multipath processor for processing the desired signal arriving from multiple paths coupled to the receiver;
a polarimetric signal processor coupled to the multipath processor for polarimetrically filtering signals that are distinguishable from the desired signal; and
a coherent processor coupled to the polarimetric signal processor for coherently combining the polarimetric filtered signal.
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Accused Products
Abstract
A combined polarimetric and coherent processing receiver (2300) can include at least one antenna (730 and 740), at least one receiver front end (700 and 704), a multipath processor (702, 706, and 714), a polarimetric signal processor (708), and a coherent processor (712). The multipath processor can be a plurality of correlators (702 and 706) coupled to the receiver front end(s) and can process the desired signal arriving from multiple paths coupled to the receiver. The polarimetric signal processor which can include a plurality of adaptive polarimetric filters (710) can be coupled to the multipath processor and can polarimetrically filter signals that are distinguishable from the desired signal. The coherent processor can be coupled to the polarimetric signal processor and can coherently combine the polarimetric filtered signal. The coherent processor can include time varying complex coefficients (714) and a signal combiner (716).
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Citations
22 Claims
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1. A system for demodulating polarimetrically diverse signals including a desired signal having a polarimetric characteristic, comprising:
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at least one antenna;
at least one receiver front end coupled to the at least one antenna;
a multipath processor for processing the desired signal arriving from multiple paths coupled to the receiver;
a polarimetric signal processor coupled to the multipath processor for polarimetrically filtering signals that are distinguishable from the desired signal; and
a coherent processor coupled to the polarimetric signal processor for coherently combining the polarimetric filtered signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A combined polarization state multipath processor receiver, comprising:
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a multipath processor; and
a polarization state processor coupled to the multipath processor for adaptively tracking and processing signals based on multiple polarization state paths from the multipath processor; and
a coherent processor coupled to the polarization state processor for coherently combining polarimetrically filtered multipath signals. - View Dependent Claims (15, 16, 17)
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18. A demodulation method, comprising the steps of:
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correlating a received signal received on multiple time delayed paths and received by at least an antenna;
adaptively filtering based on a polarization state of a desired signal from a correlator providing a plurality of polarimetrically filtered signals; and
combining the plurality of polarimetrically filtered signals in a manner meeting or exceeding a predetermined signal quality threshold. - View Dependent Claims (19, 20)
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21. A receiver apparatus, comprising:
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first and second antennas that are differently polarized within a receive band;
a reference polarization (RP) receiver that converts radio energy intercepted by the first antenna to a baseband reference received polarized signal component (R′
P (t));
an associated polarization (AP) receiver that converts radio energy intercepted by the second antenna to a baseband associated received polarized signal component (A′
P(t));
a reference polarization demodulator that generates a series of received reference polarization components R′
P (s) from the baseband reference polarization signal (R′
P(t));
an associated polarization demodulator that generates a corresponding series of received associated polarization components A′
P(s) from the baseband associated polarization signal (A′
P(t));
a demapper that generates a most likely transmitted set of data by selecting, for each pair comprising a received reference polarization component R′
P(s) and the corresponding received associated polarization component A′
P(s), a most likely transmitted polarization state (P′
j) from a constellation of polarization states (P′
), wherein the demapper comprises;
a polarimetric filter that generates an estimate of a desired signal using a dot product of a filter vector and the received reference polarization component R′
P(s) and a dot product of the filter vector and the corresponding received associated polarization component A′
P(s); and
a state demapper that determines the most likely transmitted set of data from the estimate of the desired signal, wherein the receiver measures characteristics of a channel and the state demapper uses the characteristics to correct the estimate of the desired signal before the state mapper determines the most likely transmitted set of data.
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22. A method for receiving a radio signal, comprising the steps of:
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generating a reference received signal (SH(t)) and an associated received signal (SV(t)) by intercepting a radio signal comprising a desired combined modulated state associated with a first user device combined with an undesired combined modulated state associated with a second user device, wherein the desired combined modulated signal comprises a desired polarization state associated with the first user device and the undesired modulated signal comprises an undesired polarization state associated with the second user device, and wherein the radio signal is modified by channel characteristics, and wherein the interception is performed by two differently polarized antennas, and wherein the desired and undesired polarization states have been selected from a constellation of polarization states comprising at least three polarization states;
generating complex components of a cancellation state that is orthogonally polarized to a polarization state of the undesired combined modulated radio signal;
generating an estimate of the received desired combined modulation state from a dot product of complex received state components determined from the reference received signal (SH(t)) and an associated received signal (SV(t)) and the complex components of the cancellation state; and
processing the estimate of the received desired combined modulation state by using the channel characteristics to determine a best estimate of the desired combined modulation state.
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Specification