Broadcast Beamforming Weights for Omnidirectional Low-Correlation Coverage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, broadcasting signals to multiple destination devices is challenging due to the inability to apply different beamforming weights, leading to difficulties in achieving high average received signal power while adhering to overall transmit power limitations.
Innovation Solution
The implementation of omni-directional and low-correlated pre-coding broadcast beamforming techniques, which compute beamforming weight vectors to distribute power uniformly across a sector, allowing for improved signal transmission via multiple antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional beamforming is used to transmit broadcast signals to multiple destination devices, then the transmit power can be concentrated in specific directions, but the average received signal power across all destination devices cannot be sufficiently improved
Solution Approach 1:
The invention segments the broadcast signal transmission into multiple orthogonal beamforming weight vectors, each targeting different spatial directions. By dividing the single broadcast signal into multiple beamformed components that are orthogonal to each other, the system can distribute power uniformly across multiple destination devices while maintaining adaptability to different reception locations
Solution Approach 2:
The invention creates a universal beamforming solution where a single set of orthogonal weight vectors can serve multiple destination devices simultaneously. The orthogonal beamforming weights are designed to provide omnidirectional coverage, allowing any destination device within the coverage area to receive adequate signal power without requiring device-specific customization
2Power
If beamforming weights are optimized for specific destination devices, then received signal power can be maximized for those devices, but other destination devices experience reduced signal quality
Solution Approach 1:
The invention employs orthogonal beamforming weight vectors that act as counterweights to each other in the spatial domain. The orthogonality ensures that when one beamforming vector concentrates power in a particular direction, the other orthogonal vectors provide compensating power distribution in perpendicular directions, thereby maintaining uniform average power across all destination devices while reducing harmful interference
Solution Approach 2:
The invention changes the parameters of beamforming weights from device-specific optimized values to orthogonal values that provide omnidirectional coverage. By transforming the beamforming weight vectors to be orthogonal and uniformly distributed in space, the system achieves a parameter configuration that simultaneously benefits all destination devices without creating interference imbalances
Data Source
AI summary
Techniques are provided herein to compute beamforming weight vectors for pre-coding broadcast signals. First, system parameters for a device configured to wirelessly transmit one or more broadcast signals via a plurality of antennas are determined. Based on the system parameters a plurality of beamforming weight vectors are computed. The beamforming weight vectors are computed such that they have omni-directional like characteristics and such that correlation between beamforming weight vectors is relatively low. The plurality of beamforming weight vectors are applied to each of the one or more broadcast signals for transmission by the device to produce beamformed transmit signals for transmission via the plurality of antennas.