Reception Filter Design for Inter-Cell Interference Mitigation
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Solution Overview
Problem
In wireless communication systems, particularly in MU-MIMO systems, inter-cell interference (ICI) and interference between user equipment (UEs) pose significant challenges due to limited pilot resources, leading to performance deterioration and inability to perfectly estimate UE channels, which affects data transfer rates and quality.
Innovation Solution
A method and apparatus that involve a base station receiving pilot signals from multiple UEs, estimating communication channels, determining reception and transmission filters using channel information, and employing a weight matrix based on average power to remove interference signals, specifically using a pseudo-inverse matrix for filter design to mitigate ICI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pilot resources are limited and reused among multiple UEs, then system capacity is improved, but channel estimation precision deteriorates leading to interference
Solution Approach 1:
The patent introduces a reception filter as an intermediary component that processes received signals to separate desired signals from interfering signals. The filter uses channel estimation results and interference information to compute filter coefficients, which are then applied to remove interference from composite signals containing both desired and interfering components, thereby resolving the contradiction between limited pilot resources and channel estimation precision
Solution Approach 2:
The patent implements a feedback mechanism where the base station receives interference information from user equipment, uses this feedback along with channel estimation to design reception filters, and applies these filters to remove interference. The filtered signals are then used for data detection, creating a closed-loop system that continuously optimizes signal quality despite limited pilot resources
2Adaptability or versatility
If multiple UEs use the same pilot signal for channel estimation, then pilot resource efficiency is improved, but interference between UEs increases
Solution Approach 1:
The patent converts the harmful effect of pilot reuse interference into a beneficial outcome by explicitly utilizing interference information from user equipment to design reception filters. Instead of treating pilot reuse interference as merely a problem to be avoided, the system uses this interference information constructively to compute filter coefficients that cancel out the interference, thereby allowing aggressive pilot reuse while maintaining signal quality
Solution Approach 2:
The reception filter acts as an intermediary that processes composite signals containing both desired signals and pilot reuse interference. By using channel estimation results and interference information to compute filter coefficients, the filter separates and removes interfering components while preserving desired signals, enabling multiple UEs to reuse pilot resources efficiently without mutual interference
Data Source
AI summary
The present invention relates to a method of transmitting and receiving a signal in a wireless communication system. In particular, in a time division multi-cell cooperative communication system, a base station may receive a reference signal, estimate a channel of each user terminal based on the reference signal, and determine a transmission and reception filter based on estimated channel information. The base station and a cooperative base station that cooperates with the base station may mutually exchange the reference signal and average signal power information on a terminal and determine the transmission and reception filter based on exchanged information.