Multimode Signal Acquisition with Nonlinear Distortion Compensation
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Solution Overview
Problem
Conventional communications systems face performance degradation due to nonlinear distortion, particularly in multimode environments where both non-intersymbol-correlated and intersymbol-correlated signals coexist, leading to elevated error rates that existing technologies struggle to mitigate effectively.
Innovation Solution
The system employs a transmitter and receiver architecture with reconfigurable circuitry that distinguishes between non-intersymbol-correlated and intersymbol-correlated signals, utilizing nonlinear distortion compensation and reduced state sequence estimation to adaptively manage signal processing, ensuring accurate demodulation across different signal types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional signal processing is used in multimode environments, then device complexity is reduced, but error rate increases due to nonlinear distortion
Solution Approach 1:
The patent segments the received signal into two distinct components: non-intersymbol-correlated signals processed through conventional demodulation, and intersymbol-correlated signals processed through reduced state sequence estimation. This segmentation allows each signal type to be handled with the most appropriate processing method, improving overall reliability without unnecessarily complicating the entire system.
Solution Approach 2:
The system dynamically switches between different signal processing modes based on the detected signal type. The receiver identifies whether the incoming signal is intersymbol-correlated or non-intersymbol-correlated and adapts its processing approach accordingly, enabling the system to maintain low complexity for simple signals while providing enhanced processing for complex signals that require it.
2Reliability
If nonlinear distortion compensation is applied to all signals, then error rate decreases, but processing time increases
Solution Approach 1:
The patent applies partial action by using reduced state sequence estimation only for the specific subset of signals that exhibit intersymbol correlation and are therefore susceptible to nonlinear distortion. Non-intersymbol-correlated signals bypass this complex processing step entirely, reducing overall processing time while still providing enhanced processing where it is most needed.
Solution Approach 2:
Different processing qualities are applied to different signal types: full reduced state sequence estimation with nonlinear distortion compensation is applied locally to intersymbol-correlated signals, while conventional faster processing is used for non-intersymbol-correlated signals. This localized approach optimizes the balance between error rate reduction and processing efficiency.
Data Source
AI summary
A transmitter comprises a symbol mapper operable to map a frame of bits to a frame of symbols, where the symbols correspond to a determined modulation scheme, and circuitry operable to convert the frame of symbols to a physical layer signal and transmit the physical layer signal onto a communication medium. The circuitry is operable to process the physical layer signal such that a first portion of the physical layer signal is a first type of signal (e.g., a linear signal and/or non-ISC signal) and a second portion of the physical layer signal is a second type of signal (e.g., nonlinear signal and/or ISC signal). The first portion of the physical layer signal may comprise a header, a preamble, and/or a payload of the frame. The second portion of the physical layer signal may comprise a header, a preamble, and/or a payload of the frame.