Inter-band Distortion Mitigation in Wireless TX-RX Pairs
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Solution Overview
Problem
Communication systems, particularly wireless communication systems, face significant challenges in mitigating inter-band interference and distortion, which degrade overall performance across different communication channels and frequencies, leading to issues like receiver de-sense and performance degradation.
Innovation Solution
A wireless communication device is configured with RX distortion estimators that process transmitter signals to generate distortion signals, which are then used to create correction signals to compensate for distortion in received signals, thereby mitigating interference and improving receiver performance across multiple band-pairs and channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple TX-RX pairs operate simultaneously in different band-pairs, then communication throughput and spectral efficiency are improved, but inter-modulation distortion and receiver de-sense increase
Solution Approach 1:
The patent applies preliminary action by estimating distortion signals from TX signals before they interfere with RX signals. The distortion estimator generates correction signals in advance that are then subtracted from the received signals, preventing the harmful inter-modulation distortion from degrading receiver performance while allowing multiple band-pairs to operate simultaneously
Solution Approach 2:
The patent converts the harmful inter-modulation distortion into a beneficial correction signal. By estimating the distortion that would be generated by specific TX signal combinations and subtracting these estimated distortion signals from the RX paths, the system transforms what would be harmful interference into a useful compensation mechanism that improves overall system performance
2Measurement precision
If distortion compensation processing is applied to received signals, then receiver sensitivity and signal quality are improved, but processing complexity and computational load increase
Solution Approach 1:
The distortion estimator performs preliminary processing by calculating expected distortion signals from known TX signals before they reach the receiver. This pre-computed correction approach simplifies the overall processing complexity compared to attempting to estimate and cancel distortion after it has contaminated the received signal, as the TX signal characteristics are already known at the time of distortion estimation
Data Source
AI summary
A wireless communication device includes one or more transmitter (TX)-receiver (RX) pairs, one or more RX distortion estimators, and a combiner. A first RX distortion estimator receives a first TX signal corresponding to a first TX of the first TX-RX pair and a second TX signal corresponding to a second TX of a second TX-RX pair. The first RX distortion estimator processes the first TX signal and the second TX signal based on a first base function set including at least one base function to generate a first distortion signal set including at least one distortion signal. Then, the first RX distortion estimator processes the first distortion signal set to generate a first RX correction signal. The wireless communication device's combiner generates a first distortion compensated RX signal by compensating for distortion in a first RX signal of the first TX-RX pair based on the first RX correction signal.