Explicit Beamforming Feedback Protocol Using Polar Coordinates
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Solution Overview
Problem
Current wireless communication systems face challenges in providing explicit beamforming feedback due to limited communication protocol space, necessitating a solution that supports explicit transmit beamforming using existing or new interface definitions.
Innovation Solution
The development of a communication protocol that enables explicit beamforming feedback by defining new signaling formats and frame structures to efficiently convey beamforming information from receivers to transmitters, utilizing polar coordinates to reduce feedback overhead, and supporting both implicit and explicit feedback approaches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If explicit beamforming feedback is implemented using traditional feedback methods, then beamforming accuracy is improved, but feedback packet size increases and consumes excessive communication protocol space
Solution Approach 1:
The patent extracts only the essential beamforming feedback information (channel quality indicator and precoding matrix indicator) from the complete channel state information, transmitting only what is necessary for beamforming optimization rather than the full channel matrix, thus reducing feedback overhead while maintaining beamforming accuracy
Solution Approach 2:
The feedback information is segmented into multiple components including channel quality indicator (CQI), precoding matrix indicator (PMI), and rank indicator (RI), which are transmitted separately at different times and with different priorities, allowing efficient use of limited feedback resources while maintaining accurate beamforming
2Reliability
If complete channel state information is transmitted for beamforming feedback, then beamforming performance is improved, but communication protocol overhead increases
Solution Approach 1:
The patent transmits partial channel state information (only the most significant components CQI, PMI, and RI) rather than complete channel matrix data, providing sufficient information for effective beamforming while avoiding the excessive overhead of transmitting all channel details
Solution Approach 2:
The patent changes the representation parameters of channel state information from raw channel matrix elements to compressed parameters (CQI, PMI, RI) that capture the essential beamforming characteristics using fewer bits, thus reducing protocol overhead while maintaining beamforming reliability
Data Source
AI summary
A method for feeding back transmitter beamforming information from a receiving wireless communication device to a transmitting wireless communication device includes a receiving wireless communication device receiving a preamble sequence from the transmitting wireless device. The receiving wireless device estimates a channel response based upon the preamble sequence and then determines an estimated transmitter beamforming unitary matrix based upon the channel response and a receiver beamforming unitary matrix. The receiving wireless device then decomposes the estimated transmitter beamforming unitary matrix to produce the transmitter beamforming information and then wirelessly sends the transmitter beamforming information to the transmitting wireless device.