Transmitter Non-Linearity Data for MIMO Receiver Compensation
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in efficiently processing non-linear responses in MIMO transmissions due to severe path loss and signal leakage at mmWave frequencies, leading to diminished diversity and multiplexing gains and increased bit error rates.
Innovation Solution
Characterizing the non-linear response of transmit amplifiers and providing this data to receiving devices allows for improved signal processing, enabling the recreation of the non-linear response function for enhanced channel filtering and bit error rate performance, potentially replacing or complementing digital pre-distortion techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital pre-distortion techniques are used to compensate for transmitter non-linearity, then bit error rate performance improves, but device complexity and processing overhead increase
Solution Approach 1:
The system performs preliminary characterization of the transmitter non-linear response and communicates this information to the receiver in advance. The receiver then uses this pre-provided non-linearity data to compensate for non-linear effects during signal processing, eliminating the need for complex real-time pre-distortion processing at the transmitter while maintaining improved bit error rate performance
Solution Approach 2:
The invention extracts and separates the non-linear response characterization from the main data transmission process. By isolating the non-linearity data as a separate information element that is communicated to the receiver, the system removes the computational burden of complex pre-distortion algorithms from the transmitter while still achieving reliability improvements
2Productivity
If transmitter non-linearity is compensated through complex signal processing, then spectral efficiency improves, but loss of information due to processing errors increases
Solution Approach 1:
The system implements a feedback mechanism where the transmitter characterizes its own non-linear response and provides this information to the receiver. The receiver uses this feedback information to accurately model and compensate for non-linear effects, reducing processing errors and information loss while maintaining spectral efficiency
3Device complexity
If conventional linear processing is used in the presence of transmitter non-linearity, then device complexity is reduced, but reliability and bit error rate performance deteriorate
Solution Approach 1:
The invention changes the parameter being processed from the raw signal itself to a characterization of the non-linear response. By working with non-linearity data rather than attempting to directly process and compensate for non-linear distortions in the signal path, the system achieves reliability improvements with simpler processing operations at the receiver
Data Source
AI summary
Improved wireless communications are enabled. For example, a transmitter can characterize a response of non-linear devices associated with an active-array-antenna. Data indicative of the non-linear response is forwarded to a receiving device, which can utilize the data in conjunction with decoding wireless transmissions of the active-array-antenna. Improved bit error rates can be achieved when utilizing transmitter-provided non-linear response data, as provided herein.