Coordinated Multi-Point Beamforming Weight Computation
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Solution Overview
Problem
In coordinated multi-point (CoMP) transmission, the computational intensity of computing beamforming weights is high, especially for devices with limited resources, and the feedback of these weights is computationally and storage-intensive, requiring augmented codebooks that further strain these resources.
Innovation Solution
A method and system for computing and transmitting beamforming weights that reduce computational requirements and feedback overhead by allowing separate quantization and using any feedback mechanism, including analog and non-codebook based methods, to maximize communication system capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming weights are computed to maximize link capacity in CoMP transmission, then overall system capacity is improved, but computational intensity increases and may overload the recipient device
Solution Approach 1:
The patent segments the beamforming weight computation into two parts: (1) computing individual beamforming weights for each access point separately, and (2) combining these weights through quantization and feedback. This segmentation reduces the computational burden on the recipient device compared to computing joint beamforming weights for all access points simultaneously.
Solution Approach 2:
The patent introduces quantization as an intermediary step between computing beamforming weights and providing feedback to access points. By quantizing the weights using codebooks, the system reduces the precision requirements and feedback overhead, making the overall process more computationally efficient while maintaining acceptable performance.
2Loss of information
If beamforming weights are quantized using codebook quantization to reduce feedback overhead, then feedback requirements are reduced, but augmented codebooks are needed which increase storage space and computational requirements at the recipient
Solution Approach 1:
The patent applies segmentation to the quantization process by computing and quantizing beamforming weights for each access point separately rather than jointly. This allows the use of smaller, standard codebooks for each access point individually, avoiding the need for large augmented codebooks that would be required for joint quantization of all access points together.
Data Source
AI summary
A system and method for spatial multiplexing for coordinated multi-point transmission are provided. A method for communications device operations includes receiving transmissions from at least two access points, measuring channels between the communications device and each of the at least two access points based on the received transmissions, computing beamforming weights based on the measured channels, and transmitting the beamforming weights to the at least two access points. The computing is based on attempting to maximize a capacity of a communications system containing the communications device and the at least two access points with the beamforming weights, and the beamforming weights are used at the at least two access points to beamform transmissions to the communications device using coordinated multi-point transmission.