Receiver Unit Interference Suppression via Auto-Correlation Finger Allocation
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Solution Overview
Problem
Conventional RAKE receivers face limitations in interference suppression, especially with low spreading factors, leading to poor performance for low data rate users due to high interference from high data rate users, and require significant computational resources, making it challenging to implement Generalized RAKE receivers for all users in wireless communication networks.
Innovation Solution
A receiver unit and method that calculates auto-correlation values for all multipath radio signals to determine delay positions and allocate interference suppression fingers, reducing computational complexity and improving interference suppression by using auto-correlation values to determine interference suppression weights, which are applied to combine signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Generalized RAKE receivers are implemented to improve interference suppression, then interference suppression performance is improved, but device complexity and computational resources increase significantly
Solution Approach 1:
The patent segments the interference suppression process into two distinct phases: a first phase that processes pilot signals to estimate channel responses and calculate correlation values, and a second phase that uses these pre-calculated values to process data signals. This segmentation allows computational complexity to be distributed and optimized, reducing the overall resource requirements while maintaining interference suppression performance.
Solution Approach 2:
The patent performs preliminary calculations of channel responses and correlation values during the first phase using pilot signals before the actual data signal processing in the second phase. By pre-calculating these values, the system avoids redundant computations during data processing, significantly reducing the computational resources required in real-time operation while maintaining effective interference suppression.
2Device complexity
If conventional RAKE receivers are used for low data rate users, then device complexity is low, but interference suppression performance deteriorates due to high interference from high data rate users
Solution Approach 1:
The patent implements a feedback mechanism where correlation values calculated from pilot signals are stored and reused for processing data signals from the same users. This feedback approach allows the receiver to leverage previously acquired channel information, improving interference suppression performance without requiring a more complex receiver structure, as the same hardware resources are utilized more efficiently through intelligent reuse of calculated values.
3Productivity
If spreading factors are reduced to increase data rate, then productivity increases, but interference between users increases leading to worse interference suppression
Solution Approach 1:
The patent changes the approach from relying on high spreading factors for interference suppression to using correlation-based processing that is effective regardless of spreading factor value. By calculating and utilizing correlation values between different users' signals, the system maintains effective interference suppression even when spreading factors are reduced to increase data transmission rates, thus decoupling interference suppression performance from spreading factor magnitude.
Data Source
AI summary
The invention relates to the field of radio signal receivers for use in wireless communication networks. In particular to a receiver unit having at least one antenna input for receiving multipath radio signals via a radio unit and at least one antenna from one or more user equipments is provided. The receiver unit comprises: a despreading unit configured to despread a multipath radio signal in the received multipath radio signals using a number of despreading fingers corresponding to a number of delay positions in the multipath radio signal which corresponds to a number of paths in the multipath radio signal, and a combining unit configured to apply at least one weight to the output of each of the number of allocated despreading fingers and combine the weighted outputs into a resulting equalized radio signal. The receiver unit is characterized in that it is configured to calculate auto-correlation values based on all multipath radio signals received at the at least one antenna input, determine at least one auto-correlation value based on the calculated auto-correlation values, determine at least one time value based on the at least one determined auto-correlation value, and allocate at least one interference suppression finger to a delay position in the multipath radio signal based on the at least one determined time value. The invention further relates to a receiver, a network node and a method for suppressing interference in a received multipath radio signal in a receiver unit.