Deterministic Channel Modeling for Radio Signal Equalization
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Solution Overview
Problem
In radio communication systems, especially between moving transmitters and receivers, such as missiles and ground stations, the rapidly changing channel impulse response due to relative motion and long, multipath transmission channels causes significant signal distortion, making reliable equalization challenging, especially when echoes from previous symbols interfere with current symbols, leading to difficult or impossible demodulation.
Innovation Solution
The method involves using pre-calculated or real-time deterministic channel modeling based on known landscape data, such as topographical and reflectance information, to simulate the channel impulse response and equalize radio signals, allowing for pre-equalization of signals before transmission or reception, thereby reducing the need for adaptive channel estimation and improving signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If adaptive channel estimation using training sequences is used, then the equalization can handle varying channel properties, but the complexity increases significantly at high relative speeds between transmitter and receiver
Solution Approach 1:
The patent pre-calculates the channel impulse response using a deterministic channel model based on known landscape data and transmitter/receiver positions before actual signal transmission. This preliminary determination of equalization parameters eliminates the need for complex real-time adaptive estimation during high-speed movement, resolving the contradiction between adaptability and complexity.
2Speed
If the transmitter and receiver move rapidly relative to each other, then communication coverage is expanded, but the channel impulse response changes significantly within very short time making equalization difficult
Solution Approach 1:
The system pre-determines the channel impulse response for anticipated positions along the movement trajectory using deterministic calculations based on landscape data. This allows the equalizer to be prepared in advance for rapidly changing channel conditions, maintaining reliability even at high relative speeds where traditional adaptive methods would fail.
Solution Approach 2:
The patent introduces a deterministic channel model as an intermediary that predicts channel characteristics based on geometric relationships and landscape data. This model acts as a mediator between the rapidly changing physical channel conditions and the equalization process, providing stable parameters despite high relative motion between transmitter and receiver.
3Length of stationary object
If long multipath transmission channels are used, then communication range is extended, but time-delayed echoes from previous symbols interfere with current symbols making demodulation impossible
Solution Approach 1:
The patent pre-calculates the complete channel impulse response including all multipath components and echo structures before signal transmission. By knowing the exact timing and amplitude of delayed echoes in advance through deterministic modeling, the equalizer can be precisely configured to compensate for these interference patterns, enabling reliable demodulation even in long multipath channels where traditional methods would fail.
Data Source
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AI summary
The method involves creating a channel model for the multi-way end path from the position of a transmitter and a receiver in an environment, and equalizing the radio signals transmitted from the transmitter to the receiver, using the channel model. The channel model is determined using the data obtained from a landscape model of the environment. An independent claim is included for apparatus for equalizing radio signals.