Systems and methods for compressed feedback and subcarrier grouping for beamforming

摘要

Methods and apparatuses are provided for providing compressed feedback channel state information for beamforming. A beam transmitted by a transmission source is received at a receiving device. The receiving device computes a channel state matrix H of the transmission channel based on the received beam. Using the channel state matrix H, the receiving device performs a singular value decomposition procedure that produces a steering matrix V. The singular value decomposition procedure generates a set of angles (θV, φ) from which the steering matrix V can be computed. The receiving device transmits the set of angles (θV, φ) to the transmitting device. From the set of angles (θV, φ), the transmitting device can compute the steering matrix V.

主权项

1. A method for providing feedback channel state information, the method comprising:
computing, at a receiving device, a channel state matrix H of a transmission channel based on a received beam from a transmitting device; performing, at the receiving device, a singular value decomposition procedure that produces a steering matrix V using the channel state matrix H, wherein the singular value decomposition procedure generates a first set of angles (θv, φ) comprising an angle φ; transmitting, by the receiving device, the first set of angles (θV, φ) to the transmitting device, wherein the steering matrix V is computable by the transmitting device based on the first set of angles (θV, φ) transmitted to the transmitting device; and receiving, by the receiving device, a directed beam from the transmitting device, wherein:
the directed beam comprises a first subcarrier and a second subcarrier, a steering matrix V1 for the first subcarrier is based on the first set of angles (θV, φ), and a steering matrix V2 for the second subcarrier is based on a second set of angles (θV, φ2) comprising an angle φ2, andthe angle φ2 is determined, based on a cyclic shift time TCS and a frequency separation FSC between the first subcarrier and the second subcarrier, by shifting the angle φ by a phase increment of 2πTCSFSC.