SDMA Beam Sets with Orthogonal Resources
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Solution Overview
Problem
Space-division multiple access (SDMA) wireless communication systems face challenges in providing reliable service due to weak coverage areas and increased interference caused by overlapping beams, which limit system capacity and user experience.
Innovation Solution
Implementing beamforming across multiple omni-directional antennas to create complementary beam sets with substantially orthogonal resources, such as time, frequency, or code, to enhance coverage without increasing interference, by transitioning communication links between beam sets based on signal quality metrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming or directional antenna patterns are utilized in SDMA systems, then system capacity and spatial separation are improved, but weak coverage areas between beams and increased interference due to overlapping beams occur
Solution Approach 1:
The system segments the coverage area into multiple beam sets, where each beam set covers a specific spatial region. By dividing the overall coverage into discrete beam segments, the system can manage interference and coverage more effectively, ensuring that each segment provides reliable service without causing excessive overlap with adjacent segments.
Solution Approach 2:
The patent introduces an additional dimension of resource allocation by assigning orthogonal resources (time, frequency, or code) to different beam sets. This transforms the problem from purely spatial resource management to a multi-dimensional resource allocation problem, allowing beams to be separated not only in space but also in time, frequency, or code domains, thereby reducing interference while maintaining coverage.
2Area of stationary object
If overlapping beams are used to provide complete coverage, then coverage area is improved, but interference between beams increases
Solution Approach 1:
Orthogonal resources serve as an intermediary mechanism between overlapping beams. By introducing time, frequency, or code orthogonalization as a mediating layer, the system allows beams to overlap in space while maintaining separation in the orthogonal resource domain, thus achieving complete coverage without excessive interference.
Solution Approach 2:
The system changes the parameters of beam transmission by assigning different orthogonal resources (time slots, frequency bands, or codes) to different beam sets. This parameter differentiation allows beams to coexist in the same spatial region without interfering with each other, as they operate on different orthogonal parameters.
3Object-generated harmful factors
If orthogonal resources are assigned to beam sets, then interference is reduced, but resource allocation complexity increases
Solution Approach 1:
The orthogonal resource allocation mechanism serves multiple functions simultaneously: it separates beams in the spatial domain, manages interference between overlapping beams, and provides a systematic framework for resource allocation. This multi-functionality reduces the need for separate interference management mechanisms, thereby limiting the increase in overall system complexity.
Data Source
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AI summary
A wireless communication system can implement beamforming across multiple omni-directional antennas to create beams at different spatial directions. The communication system can arrange the beams in sets, with each set arranged to provide substantially complete coverage over a predetermined coverage area. The communication system can arrange the multiple SDMA beam sets to support substantially complementary coverage areas, such that a main beam from a first set provides coverage to a weak coverage area of the second beam set. The wireless communication system assigns or otherwise allocates substantially orthogonal resources to each of the beam sets. The wireless communication system allocates resources to a communication link using a combination of beam sets and substantially orthogonal resources in order to provide improved coverage without a corresponding increase in interference.