Multi-User CSM Permutation for Interference Averaging
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Solution Overview
Problem
Existing wireless communication systems face limitations in uplink transmission capacity due to self-interference and interference between layers in multi-user Collaborative Spatial Multiplexing (CSM), which affects signal quality and data transmission efficiency.
Innovation Solution
The method involves permutating resource units allocated to multiple layers using different permutation schemes, averaging self-interferences across users, and applying unique permutation equations for each layer to reduce self-interference and improve channel prediction accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Spatial Multiplexing technology is used to extend transmission channel, then data transmission capacity is increased, but self-interference is additionally generated
Solution Approach 1:
The patent segments the transmission channel into multiple spatial layers using multi-antenna technology, allowing simultaneous transmission of multiple data streams. This segmentation enables increased transmission capacity while managing self-interference through layer separation and dedicated resource allocation for each layer.
Solution Approach 2:
The patent changes transmission parameters including power allocation across multiple antennas, resource unit permutation schemes, and layer-specific modulation schemes. These parameter changes optimize the balance between utilizing spatial multiplexing for capacity enhancement and controlling the resulting self-interference through adaptive parameter adjustment.
2Productivity
If multi-user CSM is used to increase transmission capacity, then more data can be transmitted, but self-interference and inter-layer interference occur
Solution Approach 1:
The patent introduces resource unit permutation in the time-frequency dimension to separate overlapping signals from different users and layers. By permuting resource units differently for each layer and user, the system creates dimensional separation that reduces inter-layer interference while maintaining high transmission capacity through multi-user spatial multiplexing.
Solution Approach 2:
The patent employs permutation schemes as an intermediary mechanism between multiple users and layers sharing the same resources. This intermediary transformation of resource unit allocation patterns enables the system to manage inter-layer interference by creating distinct resource patterns for each layer, allowing simultaneous transmission without direct signal collision.
3Productivity
If resource units are allocated to multiple layers, then transmission capacity increases, but self-interference averaging becomes complex
Solution Approach 1:
The patent implements periodic permutation patterns for resource unit allocation across layers and users. This periodic structure simplifies the complexity of multi-user allocation by using repeating patterns that are easy to generate and track, while still achieving self-interference averaging and maintaining high transmission capacity through systematic resource distribution.
Data Source
AI summary
A method and an apparatus operate multi-user Collaborative Spatial Multiplexing (CSM) in a wireless communication system. A Base Station (BS), performs uplink transmission scheduling on multiple Mobile Stations (MSs). Resources units, which have been allocated to multiple layers spatially discriminated by the uplink transmission scheduling, are permutated by applying different permutation schemes according to layers. Uplink data is received from the scheduled MSs through the permutated resource units. Each MS uses permutation schemes according to the layers allocated in a manner corresponding to the BS. Therefore, when the multi-user CSM is used, self-interferences or interferences between layers are averaged, thereby reducing variable widths of parameters of various kinds and improving the prediction property of a received SINR. As a result, a Packet Error Ratio (PER) performance is improved when data is actually transmitted.