Interference-cognitive transmission
Interference cognitive devices are described. An interference cognitive device can be collocated with a transmitter of an interference cognitive transmitter (ICT), as receive chains or portions thereof at the ICT. An interference cognitive device can also be remote with respect to the transmitter, which operates in an interference cognitive network and receives data directly or indirectly from the interference cognitive device. The ICT uses the data to mitigate interference while continuing to operate in accordance with a performance metric.
1. A system comprising:
an interference-cognitive device;
a transmit antennae weighting engine including:
a weighting matrix computation engine;
a matrix multiplication engine coupled to the weighting matrix computation engine;
a precoding engine coupled to the transmit antennae weighting engine;
an antennae array coupled to the precoding engine;
wherein, in operation:
the weighting matrix computation engine has interference covariance from the interference-cognitive device as input and computes an antennae weighting matrix M using the interference covariance and a performance metric;
the matrix multiplication engine has channel state information (CSI) from the interference-cognitive device as input and computes a modified channel estimate using the CSI and the antennae weighting matrix M;
the precoding engine has a constellation vector as input and computes a transmit vector using the constellation vector and the modified channel estimate, wherein the transmit vector is associated with data bits mapped onto the constellation vector to be transmitted via the antennae array.
2. The system of claim 1 , wherein the interference-cognitive device is collocated on a device that includes the transmit antennae weighting engine.
3. The system of claim 1 further comprising:
a forward error correction (FEC) encoder;
a buffer coupled to the FEC encoder;
a plurality of bit interleavers coupled to the buffer;
a plurality of constellation mappers coupled to the plurality of bit interleavers, wherein the precoding engine is coupled to the plurality of constellation mappers;
a plurality of digital-to-analog (D/A) converters coupled to the precoding engine;
a plurality of transmit radio frequency (RF) chains coupled to the plurality of D/A converters, wherein the transmit RF chains are coupled to the antennae array;
wherein, in operation,
the FEC encoder encodes data bits into the buffer;
the bit interleavers interleave the value in the buffer;
the constellation mappers map the result of the bit interleavers to the constellation vector the precoding engine has as input;
the D/A converters convert the transmit vector to analog signals;
the transmit RF chains provide the analog signals for transmission on the antennae array.
4. The system of claim 1 , wherein the weighting matrix computation engine further has estimation quality from receive chains as input.
5. The system of claim 1 , wherein the transmit antennae weighting engine further includes a performance metric engine that provides the performance metric.
6. The system of claim 5 , further comprising a controller, wherein, in operation:
the controller tunes to each of a plurality of carrier frequencies;
the performance metric engine computes performance metrics using channel state information (CSI) and interference covariance information associated with each of the plurality of carrier frequencies;
the controller tunes to the carrier frequency that had the best performance metric for data communication.
7. The system of claim 1 , further comprising a controller, wherein, in operation:
the controller determines whether antennae array is, at least in part, idle;
the weighting matrix computation engine computes the matrix M using estimated interference covariance associated with an external device, wherein the matrix M is applied to channel estimates.
8. The system of claim 1 , further comprising:
a receive antennae weighting engine, coupled to the antennae array, including:
a weighting matrix computation engine;
a matrix multiplication engine coupled to the weighting matrix computation engine;
a matrix-vector multiplication engine coupled to the weighting matrix computation engine;
wherein, in operation:
the weighting matrix computation engine generates a weighting matrix using an interference covariance metric and a performance metric;
the matrix multiplication engine generates a precoding matrix using a channel estimate and the weighting matrix;
the matrix-vector multiplication engine generates a weighted vector using a received vector and the weighting matrix, wherein the received vector is associated with interference from an external device received on the antennae array.
9. The system of claim 1 , further comprising an interference-adaptive receiver for receiving signals transmitted through the antennae array.
10. The system of claim 1 , further comprising a receiver that is not interference adaptive for receiving signals transmitted through the antennae array.