Multi-mode Receiver for Spectrally Efficient Communications
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Solution Overview
Problem
Existing communications methods and systems are overly power hungry and spectrally inefficient, failing to optimize signal transmission and reception in the presence of non-linearity and multipath effects.
Innovation Solution
The system employs a multi-mode transmitter and receiver configuration that uses partial response pulse shaping and sequence estimation to improve spectral efficiency, incorporating dynamic filter adjustments and non-linearity modeling to enhance performance in non-linear channels, while reducing complexity and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional communication methods are used, then system simplicity is maintained, but spectral efficiency is poor and power consumption is high
Solution Approach 1:
The receiver is configured to operate in multiple modes (first mode with near-zero ISI filter and symbol slicing, second mode with partial response filter and sequence estimation) allowing dynamic adaptation to different channel conditions. This enables the system to achieve high spectral efficiency when needed while maintaining simplicity in favorable conditions
Solution Approach 2:
The system changes operational parameters (filter type, detection method) based on channel characteristics. By switching between different receiver configurations, the system optimizes spectral efficiency and power consumption according to actual transmission conditions without requiring a completely complex system design
2Reliability
If conventional receiver methods are used, then implementation simplicity is maintained, but symbol error rate is higher in non-linear channels
Solution Approach 1:
The receiver dynamically selects between two operational modes based on channel conditions. In mode 1, simple symbol slicing is used for reliable detection in linear channels. In mode 2, sequence estimation with partial response filtering provides better reliability in non-linear channels with multipath effects, while still using the same physical hardware
Solution Approach 2:
The invention extracts and addresses only the specific problem of non-linear channel effects when present, by selectively applying sequence estimation and partial response filtering only when needed, rather than always using the complex approach. This reduces average receiver complexity while improving reliability when required
3Productivity
If linear channel assumptions are made, then analysis simplicity is maintained, but performance degrades in presence of non-linearity and multipath
Solution Approach 1:
The system changes its signal processing parameters based on channel characteristics. When non-linearity and multipath are detected or expected, the receiver switches to mode 2 with partial response filtering and sequence estimation, which are specifically designed to handle such conditions and improve communication performance
Solution Approach 2:
The system uses feedback about channel conditions (through mode selection based on received signal characteristics) to adjust the receiver configuration. This allows the system to adapt to non-linear channels and multipath effects, improving performance without requiring complex real-time processing in all cases
Data Source
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AI summary
A receiver may be dynamically configurable, during run-time, into a plurality of modes of operation. In a first mode of operation the receiver may demodulate received signals having relative low inter-symbol correlation using a near zero ISI filter and symbol slicing. In a second mode of operation the receiver may demodulate received signals having relatively high inter-symbol correlation using an input filter configured to achieve a desired total partial response and a sequence estimation algorithm.