CoMP Receiver Interference Rejection Using Spectrally Whitened Streams
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Solution Overview
Problem
Cooperative multi-point communication systems face challenges in effectively coordinating channel state information and managing interference among neighboring base stations, leading to suboptimal performance in downlink and uplink transmissions.
Innovation Solution
The system employs spectrally whitened channel parameters and data streams from multiple radio units, which are summed and combined to extract a desired data stream, utilizing interference rejection techniques to enhance signal processing and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cooperative multi-point communication is implemented without interference rejection, then system complexity is reduced and ease of operation is improved, but interference between radio units degrades data stream processing performance and channel estimation accuracy
Solution Approach 1:
The system performs spectrally whitening transformation on received signals before combining them from multiple radio units. This preliminary processing step transforms colored interference into white noise, simplifying subsequent interference rejection operations and improving channel estimation accuracy without requiring complex post-processing
Solution Approach 2:
The invention changes the spectral characteristics of received signals by applying a spectrally whitening transformation that modifies the interference covariance matrix. This parameter transformation converts correlated interference into uncorrelated white noise, enabling more effective interference rejection combining while maintaining manageable system complexity
2Productivity
If spectrally whitening and interference rejection combining is applied, then data stream processing efficiency and channel estimation are improved, but computational complexity and processing time increase
Solution Approach 1:
The system computes the spectrally whitening transformation matrix once based on interference covariance estimation, then applies this pre-computed transformation to multiple data streams. This preliminary computation avoids repeated complex calculations for each stream, improving overall processing efficiency
Solution Approach 2:
The invention combines spectrally whitening transformation with interference rejection combining in a unified processing framework. By merging these operations and exploiting their mathematical relationships, the system reduces the total number of separate computational steps compared to performing them sequentially as independent operations
3Area of stationary object
If multiple radio units are used for cooperative communication, then coverage area and signal diversity are improved, but interference management becomes more difficult and processing complexity increases
Solution Approach 1:
The system transforms the interference covariance matrix from multiple radio units into a whitened form with identity covariance structure. This parameter transformation simplifies the interference management problem by converting complex correlated interference from multiple sources into simple white noise, making the system scalable to multiple radio units
Solution Approach 2:
The system performs preliminary estimation of interference covariance matrices from each radio unit and computes their combined effect before data stream processing. This upfront characterization of interference from multiple sources enables simplified subsequent processing and avoids the need for complex real-time interference management
Data Source
AI summary
This document discloses a solution for performing interference cancellation in a radio receiver. According to an aspect, there is provided a method for an apparatus of an access node, comprising: receiving, by the apparatus from a first radio unit of the access node via a first interface, a first spectrally whitened channel parameter and a first spectrally whitened data stream; receiving, by the apparatus from a second radio unit of the access node via a second interface, a second spectrally whitened channel parameter and a second spectrally whitened data stream; summing, by the apparatus, the first spectrally whitened channel parameter with the second spectrally whitened channel parameter and summing the first spectrally whitened data stream with the second spectrally whitened data stream; and extracting, by the apparatus, a desired data stream from the summed spectrally whitened data streams by using the sum of the first spectrally whitened channel parameter and the second spectrally whitened channel parameter.