Method and apparatus in relaying system
AssigneeNokia Corporation
InventorsHaifeng Wang, Xiaomei Xia, Shengyao Jin, Honglin Hu
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Abstract
An apparatus, comprising a channel estimator for estimating channel coefficients of communication channels of multiple-input-multiple-output communication, a precoder for applying the estimated channel coefficients to precode a transmit signal to cancel the impact of the communication channels on the transmit signal, a first controller for providing the transmit signal for multiple-input-multiple-output transmission in a first timeslot, a second controller for processing a multiple-input-multiple-output receive signal received in a second timeslot following the first timeslot, and a cancellator for cancelling the transmit signal from the receive signal.
Claims14
An apparatus, comprising:
- a channel estimator configured to estimate channel coefficients of communication channels of multiple-input-multiple-output communication;
- a precoder configured to apply the estimated channel coefficients to precode a transmit signal to cancel impact of the communication channels on the transmit signal;
- a first controller configured to provide the precoded transmit signal for multiple-input-multiple-output transmission in a first timeslot;
- a second controller configured to process a multiple-input-multiple-output receive signal received in a second timeslot following the first timeslot;
- and
- a cancellator configured to cancel the transmit signal from the receive signal,
- wherein the first controller is configured to provide the transmit signal for transmission via a first radio antenna, and a negation of the transmit signal for transmission via a second transmit antenna, and
- wherein the second controller is configured to process receive signals received via two radio antennas, the apparatus comprising a signal estimator configured to estimate a received signal, the signal estimator being, in estimation of the received signal, configured to:
- form a difference of receive signals received via the two radio antennas;
- multiply the difference by one divided by the square-root of two.
An apparatus, comprising:
- a channel estimator configured to estimate channel coefficients of communication channels of multiple-input-multiple-output communication;
- a precoder configured to apply the estimated channel coefficients to precode a transmit signal to cancel impact of the communication channels on the transmit signal;
- a first controller configured to provide the precoded transmit signal for multiple-input-multiple-output transmission in a first timeslot;
- a second controller configured to process a multiple-input-multiple-output receive signal received in a second timeslot following the first timeslot;
- and
- a cancellator configured to cancel the transmit signal from the receive signal,
- wherein the precoder is configured to precode at least two transmit signals each targeting to a different receiving station, and
- wherein the second controller is configured to process receive signals received via two radio antennas, the apparatus comprising a signal estimator configured to estimate two received signals each transmitted by different stations, the signal estimator being, in estimation of the received signals, configured to in estimation of the first received signal:
- form a sum of the receive signals received via the two radio antennas;
- multiply the sum by one divided by two;
- and in estimation of the second received signal:
- form a difference of the receive signals received via the two radio antennas;
- and
- multiply the difference by one divided by the square-root of two.
Dependencies are inferred from the claim text.