Beamforming Training for SDMA Interference Reduction
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Solution Overview
Problem
Current Spatial Division Multiple Access (SDMA) communication schemes face challenges in efficiently managing simultaneous transmissions and receptions across multiple wireless communication devices on the same frequency, leading to potential interference and coordination issues.
Innovation Solution
Implementing a method where a wireless communication device reserves a communication medium for a time period, transmits different signals simultaneously via antennas, and determines beamforming schemes to ensure that signals intended for multiple devices are directed in different directions, using techniques like Request-To-Send (RTS) packets and beamforming training sequences to coordinate transmissions and receptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SDMA communication transmits different signals simultaneously via multiple antennas to multiple devices on the same frequency, then communication efficiency and spectral utilization are improved, but interference between signals and coordination complexity increase
Solution Approach 1:
The patent applies local quality by transmitting different signals in different spatial directions using multiple antennas. Each signal is directed toward a specific wireless communication device based on its spatial location, allowing simultaneous transmissions on the same frequency without interference. This spatial differentiation enables the system to achieve high communication efficiency while avoiding signal collision through directional transmission control.
2Use of energy by moving object
If multiple wireless communication devices transmit and receive signals simultaneously on the same frequency, then spectral utilization is improved, but coordination difficulty and interference management complexity increase
Solution Approach 1:
The patent resolves coordination complexity by adding a spatial dimension to the communication system. Instead of managing simultaneous transmissions only in time and frequency domains, the system utilizes the spatial dimension through multiple antennas to create distinct transmission paths. This dimensional expansion allows multiple devices to communicate simultaneously without complex coordination, as each device receives signals from specific antenna combinations tailored to its spatial position.
3Measurement precision
If beamforming schemes are used to direct signals in different directions, then signal targeting precision is improved, but computational complexity and processing requirements increase
Solution Approach 1:
The patent applies preliminary action by performing beamforming training sequences before actual data transmission. During this training phase, the system pre-determines the optimal beamforming schemes for each wireless communication device based on channel characteristics and spatial positions. These pre-computed beamforming parameters are then stored and reused during subsequent communications, eliminating the need for real-time complex calculations and reducing processing complexity while maintaining high signal targeting precision.
Data Source
AI summary
Some demonstrative embodiments include devices, systems and/or methods of simultaneously communicating with a group of wireless communication devices. For example, a device may include a wireless communication unit to transmit at least one beamforming-training initiation frame to a group of a plurality of wireless communication devices, wherein the wireless communication unit is to receive two or more feedback frames from two or more of the wireless communication devices, wherein the wireless communication unit is to determine two or more beamforming schemes based on the two or more feedback frames, and wherein the wireless communication unit is to simultaneously transmit two or more different wireless communication transmissions to the two or more wireless communication devices, respectively, using the two or more beamforming schemes, respectively. Other embodiments are described and claimed.