Dynamic space division duplex (SDD) wireless communications with multiple antennas using self-interference cancellation
First Claim
1. A method of providing full-duplex communication in a pre-determined frequency band using a wireless communication unit having a plurality of antennas, the method comprising the steps of:
- the wireless unit receiving one or more receive data streams in the pre-determined frequency band utilizing a first subset of the plurality of antennas, wherein the first subset includes at least one antenna from the plurality of antennas as a receive antenna;
the wireless unit simultaneously transmitting one or more transmit data streams in the pre-determined frequency band utilizing a second subset of the plurality of antennas, wherein the second subset includes less than or equal to a total number of antennas in the plurality of antennas as transmit antennas, wherein at least one antenna is shared for simultaneous transmission and reception;
the wireless unit determining a Self-Interference Cancelling (SIC) precoder based on a null space of an estimate of a Self-Interference (SI) channel matrix for the predetermined frequency band; and
based on the determined SIC precoder, the wireless unit adjusting relative amplitudes and relative phases of radio signals carrying the transmit data streams that are transmitted through the transmit antennas in the pre-determined frequency band such that destructive interference reduces a magnitude of the radio signals received at each receive antenna when transmitting in the pre-determined frequency band.
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Accused Products
Abstract
A system and method to perform Full Duplex (FD) Space Division Duplex (SDD) communication using a Self-Interference Cancelling (SIC) precoder that applies different antenna phase shifts and amplitude scales to the transmitted signals to force them to be in the null space of the selected receive antennas. Thus, a wireless communication unit can place nulls at each of its receive antennas digitally at baseband for one or more frequency bands. The SIC precoder may be computed based on the self-interference channel from the transmit chain(s) to the receive chain(s). Different SIC precoders may be adaptively selected and stored digitally for different frequency bands. Subsequent single or multi-user precoder can be applied in concatenation with the SIC precoder to transmit signals to one or more users while receiving signals from one or more users simultaneously over the same frequency band.
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Citations
21 Claims
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1. A method of providing full-duplex communication in a pre-determined frequency band using a wireless communication unit having a plurality of antennas, the method comprising the steps of:
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the wireless unit receiving one or more receive data streams in the pre-determined frequency band utilizing a first subset of the plurality of antennas, wherein the first subset includes at least one antenna from the plurality of antennas as a receive antenna; the wireless unit simultaneously transmitting one or more transmit data streams in the pre-determined frequency band utilizing a second subset of the plurality of antennas, wherein the second subset includes less than or equal to a total number of antennas in the plurality of antennas as transmit antennas, wherein at least one antenna is shared for simultaneous transmission and reception; the wireless unit determining a Self-Interference Cancelling (SIC) precoder based on a null space of an estimate of a Self-Interference (SI) channel matrix for the predetermined frequency band; and based on the determined SIC precoder, the wireless unit adjusting relative amplitudes and relative phases of radio signals carrying the transmit data streams that are transmitted through the transmit antennas in the pre-determined frequency band such that destructive interference reduces a magnitude of the radio signals received at each receive antenna when transmitting in the pre-determined frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A wireless communication unit having a plurality of antennas to provide full-duplex communication at a given frequency in a pre-determined frequency band, wherein the wireless communication unit is configured to perform the following:
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receive one or more receive data streams in the pre-determined frequency band utilizing a first subset of the plurality of antennas, wherein the first subset includes at least one antenna from the plurality of antennas as a receive antenna; simultaneously transmit one or more transmit data streams in the pre-determined frequency band utilizing a second subset of the plurality of antennas as transmit antennas, wherein the second subset includes less than or equal to a total number of antennas in the plurality of antennas, wherein at least one antenna is shared for simultaneous transmission and reception; determine a Self-Interference Cancelling (SIC) precoder based on a null space of an estimate of a Self-Interference (SI) channel matrix for the predetermined frequency band; and based on the determined SIC precoder, adjust relative amplitudes and relative phases of radio signals carrying the transmit data streams that are transmitted through the transmit antennas in the pre-determined frequency band such that destructive interference reduces a magnitude of the radio signals received at each receive antenna when transmitting in the pre-determined frequency band. - View Dependent Claims (21)
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Specification