RAKE Receiver SINR Feedback for Interference Suppression
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Solution Overview
Problem
RAKE receivers in WCDMA networks face performance degradation due to multiple access interference, particularly in frequency selective channels, which complicates signal detection and requires complex interference cancellation methods not feasible for mobile terminals.
Innovation Solution
A method that calculates signal-to-interference-plus-noise ratio (SINR) values based on weight values, with the maximum SINR values being fed back to the transmitter to optimize closed loop transmit diversity modes, thereby improving RAKE receiver performance by accounting for inter-path interference in multipath fading environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RAKE receiver is used in WCDMA network, then signal detection capability is improved, but performance degradation occurs due to multiple access interference and inter-path interference
Solution Approach 1:
The patent implements feedback mechanisms where the receiver calculates SINR values based on received signals and channel estimates, then feeds back weight values to the transmitter. The transmitter uses these weights to adjust transmit signals, creating a closed-loop system that continuously optimizes performance while suppressing interference
Solution Approach 2:
The patent changes the parameter of signal weighting by calculating optimal weight values based on channel impulse response and SINR measurements. These weight values are used to adjust the contribution of different propagation paths in the RAKE receiver, optimizing signal detection while minimizing interference from frequency selective fading
2Object-affected harmful factors
If complex interference cancellation methods are implemented, then interference suppression is improved, but device complexity increases making it infeasible for mobile terminals
Solution Approach 1:
The patent introduces weight values as intermediary parameters that mediate between the received signal and the detected signal. These weights are calculated based on channel conditions and SINR measurements, providing a simplified mechanism to suppress interference without requiring complex interference cancellation algorithms
Solution Approach 2:
The patent applies partial action by focusing interference suppression efforts on the most significant interference sources identified through SINR calculation. Rather than attempting to cancel all interference components equally, the system selectively applies weighting to paths with better SINR characteristics, reducing computational complexity while maintaining effectiveness
3Reliability
If closed loop transmit diversity modes are used, then signal robustness is improved, but interference from multiple paths causes performance degradation
Solution Approach 1:
The patent applies local quality by assigning different weight values to different propagation paths based on their individual channel conditions and SINR characteristics. Instead of treating all paths uniformly, the system identifies and weights paths with better quality (higher SINR) more heavily, while suppressing contributions from paths with poorer quality, thus reducing inter-path interference while maintaining diversity benefits
Data Source
AI summary
Methods and systems for processing signals in a wireless communication system are disclosed. Aspects of the method may include calculating at a receiver, a plurality of signal-to-interference-plus-noise ratio (SINR) values for a wireless signal, which is received from a transmitter, based on a corresponding plurality of weight values. A maximum one of the calculated plurality of SINR values may be determined. At least one weight value including one of the corresponding plurality of weight values may be fed back to the transmitter. The at least one weight value including one of the corresponding plurality of weight values may be associated with the determined maximum one of the calculated plurality of SINR values. The at least one weight value including one of the corresponding plurality of weight values may be communicated to the transmitter via at least one downlink communication channel.