Uplink CINR Estimation Using Full Fast Feedback Correlation
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Solution Overview
Problem
Current methods for estimating Carrier-to-Interference and Noise Ratio (CINR) in broadband wireless communication systems are inefficient as they do not fully utilize the information from the uplink fast feedback channel, leading to unreliable CINR estimation and subsequent interference and degradation in link performance.
Innovation Solution
The method involves correlating all symbols in the uplink fast feedback signal with each codeword, squaring the absolute values, and summing them to select the maximum codeword, then calculating received power and noise power levels to estimate CINR, utilizing both modulation and pilot symbols for accurate channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current CINR estimation methods are used, then the estimation process is simple, but the CINR estimation reliability is poor
Solution Approach 1:
The patent combines multiple symbols (modulation symbols and pilot symbols) from the uplink fast feedback channel into a single integrated estimation process. By merging these different symbol types and using their combined energy for CINR calculation, the method achieves more reliable estimation while maintaining reasonable computational complexity through unified processing of all available channel information.
Solution Approach 2:
The patent makes the CINR estimation method universally applicable by utilizing all symbols in the uplink fast feedback channel for a single purpose - CINR estimation. This multi-functional use of feedback channel symbols (both modulation and pilot) maximizes the information extraction from the channel, improving reliability without requiring separate dedicated pilot signals.
2Productivity
If all symbols in the uplink fast feedback channel are utilized for CINR estimation, then the detection efficiency of fast feedback information is enhanced, but the processing complexity increases
Solution Approach 1:
The patent performs preliminary correlation of all feedback channel symbols with codewords before the actual CINR estimation. By pre-processing the symbols through correlation and selecting the maximum correlation result, the method enhances detection efficiency while organizing the data in a way that simplifies subsequent CINR calculation, thereby managing processing complexity effectively.
Solution Approach 2:
The patent replaces traditional separate processing methods for modulation symbols and pilot symbols with a unified computational approach. Instead of mechanically handling different symbol types separately through multiple processing paths, the invention uses a single integrated mathematical framework that processes all symbols together, enhancing detection efficiency while reducing overall system complexity.
Data Source
AI summary
An apparatus and method for estimating the CINR of an uplink channel in a broadband wireless communication system are provided, in which tiles being subcarrier sets are separated from a feedback signal received on the uplink channel. All symbols included in the tiles of the feedback signal are correlated with each of codewords, the absolute values of the correlations are squared for the each codeword and summed, a codeword with a maximum sum from among the codewords is selected. Received power level and noise power level are calculated using all the symbols included in the tiles of the feedback signal correlated with the codeword with the maximum sum, and the CINR of the uplink channel is estimated using the received power and the noise power levels.