Non-line of sight wireless communication system and method
First Claim
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1. A wireless communication system, comprising:
- a communication link having a first end and a second end that communicate over reciprocal radio frequency channels, the communication link having a plurality of radios at the first end of the communication link and a combining radio at the second end of the communication link, each radio having a transmit beamformer, a receive beamformer and an adaptive antenna array having a plurality of antennas, each antenna communicating a beam and the plurality of beams of the plurality of antennas are adaptively combined and communicated over the communication link;
each of the radios at the first end of the communication link that is capable of computing a receive beamform weight, estimating a signal to noise ratio for a data stream, forming transmit beamform weights based on the receive beamform weight and communicating the estimated signal to noise ratio for the data stream over the communication link using the formed transmit beamform weights and the adaptive antenna array to the combining radio at the second end of the communication link; and
the combining radio that is capable of simultaneously computing a receive beamform weight for each radio at the first end of the communication link based on the data communicated from each radio at the first end of the communication link, estimating a signal to noise ratio for the data communicated from each radio at the first end of the communication link, forming transmit beamform weights based on the simultaneous receive beamform weights and communicating the estimated signal to noise ratio for the communicated data over the communication link using the formed transmit beamform weights and the adaptive antenna array back to each radio at the first end of the communication link to optimize and equalize the transmission of data over the communication link.
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Abstract
A non-line of sight backhaul system and method are described that provides self-alignment of the antennas beams of the wireless radios of the system, that provides robust operation in licensed and unlicensed frequency bands, that facilitates the use of a reduced number of frequency channels from M to 1 and that enables operation in a non-line of sight (NLOS) propagation environment.
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Citations
19 Claims
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1. A wireless communication system, comprising:
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a communication link having a first end and a second end that communicate over reciprocal radio frequency channels, the communication link having a plurality of radios at the first end of the communication link and a combining radio at the second end of the communication link, each radio having a transmit beamformer, a receive beamformer and an adaptive antenna array having a plurality of antennas, each antenna communicating a beam and the plurality of beams of the plurality of antennas are adaptively combined and communicated over the communication link; each of the radios at the first end of the communication link that is capable of computing a receive beamform weight, estimating a signal to noise ratio for a data stream, forming transmit beamform weights based on the receive beamform weight and communicating the estimated signal to noise ratio for the data stream over the communication link using the formed transmit beamform weights and the adaptive antenna array to the combining radio at the second end of the communication link; and the combining radio that is capable of simultaneously computing a receive beamform weight for each radio at the first end of the communication link based on the data communicated from each radio at the first end of the communication link, estimating a signal to noise ratio for the data communicated from each radio at the first end of the communication link, forming transmit beamform weights based on the simultaneous receive beamform weights and communicating the estimated signal to noise ratio for the communicated data over the communication link using the formed transmit beamform weights and the adaptive antenna array back to each radio at the first end of the communication link to optimize and equalize the transmission of data over the communication link. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 17)
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9. A wireless communication method, comprising:
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providing a communication link having a first end and a second end, the communication link having a plurality of radios at the first end of the communication link and a combining radio at the second end of the communication link, each radio having a transmit beamformer, a receive beamformer and an adaptive antenna array having a plurality of antennas, each antenna communicating a beam and the plurality of beams of the plurality of antennas are adaptively combined and communicated over the communication link; and optimizing the communication link wherein optimizing the communication link further comprises; performing optimization at each of the radios at the first end of the communication link comprising computing a receive beamform weight, estimating a signal to noise ratio for a data stream received, forming transmit beamform weights based on the receive beamform weight and communicating the estimated signal to noise ratio for the data stream over the communication link using the formed transmit beamform weights and the adaptive antenna array to the combining radio at the second end of the communication link; and performing optimization at the combining radio comprising simultaneously computing a receive beamform weight for each radio at the first end of the communication link based on the data communicated from each radio at the first end of the communication link, estimating a signal to noise ratio for the data communicated from each radio at the first end of the communication link, forming transmit beamform weights based on the simultaneous receive beamform weights and communicating the estimated signal to noise ratio for the communicated data over the communication link using the formed transmit beamform weights and the adaptive antenna array back to each radio at the first end of the communication link to optimize and equalize the transmission of data over the communication link. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 18)
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19. A wireless communication method, comprising:
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providing a communication link having a first end and a second end, the communication link having at least one radio at each end of the communication link, each radio having a transmit beamformer, a receive beamformer and an adaptive antenna array having a plurality of antennas, each antenna communicating a beam and the plurality of beams of the plurality of antennas are adaptively combined and communicated over the communication link; and wherein optimizing the communication link further comprises; performing optimization at the at least one radio at the first end of the communication link comprising computing a receive beamform weight, estimating a signal to noise ratio for a data stream received, forming transmit beamform weights based on the receive beamform weight and communicating the estimated signal to noise ratio for the data stream over the communication link using the formed transmit beamform weights and the adaptive antenna array to at least one radio at the second end of the communication link; performing optimization at the at least one radio at the second end of the communication link comprising computing a receive beamform weight based on the data communicated from the at least one radio at the first end of the communication link, estimating a signal to noise ratio for the data communicated from the at least one radio at the first end of the communication link, forming transmit beamform weights based on the receive beamform weight and communicating the estimated signal to noise ratio for the communicated data over the communication link using the formed transmit beamform weights and the adaptive antenna array back to the at least one radio at the first end of the communication link; and wherein the transmit and receive beamform weights are sequentially adapted by the at least one radio at the first end of the communication link, the at least one radio at the second end of the communication link and again by the at least one radio at the first end of the communication link.
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Specification