Receiving Apparatus Accelerating Equalization Convergence
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Solution Overview
Problem
Conventional channel equalization methods require a lengthy convergence time to achieve a high signal-to-noise ratio (SNR) in communication systems affected by multipath effects, which is unacceptable for high-speed communication systems.
Innovation Solution
A receiving apparatus and method that includes a filter to reduce the multipath effect and a channel estimator to determine whether filtering is necessary, with the filtered signal being sent to an equalizer to accelerate convergence, allowing for quick SNR attainment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional channel estimation and equalization is used without pre-filtering, then the equalizer can process the received signal directly, but the convergence time is excessively long due to multipath effects
Solution Approach 1:
The patent applies preliminary action by introducing a pre-filter before the equalizer that performs initial channel equalization based on channel impulse response estimation. This pre-filter processes the received signal beforehand to mitigate multipath effects, allowing the main equalizer to converge much faster. The pre-filter computes preliminary equalized signals using estimated channel characteristics, which are then combined with the main equalizer output to achieve rapid convergence.
2Productivity
If a pre-filter is added to reduce multipath effects before equalization, then the equalizer convergence is accelerated, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the equalization process into two separate stages: a pre-filter stage that performs initial channel equalization based on channel impulse response, and a main equalizer stage that performs final signal recovery. This segmentation allows each component to specialize in specific tasks, with the pre-filter handling multipath mitigation and the main equalizer focusing on convergence, thereby improving overall equalization speed while keeping each module relatively simple.
Solution Approach 2:
The patent introduces an intermediary pre-filter component between the received signal and the main equalizer. This pre-filter acts as a mediator that processes the signal using channel impulse response estimation to reduce multipath effects before the signal reaches the main equalizer. The pre-filter computes preliminary equalized signals that are then combined with the main equalizer output, serving as an intermediate processing stage that accelerates convergence without requiring complete redesign of the equalizer itself.
3Measurement precision
If the equalizer processes signals with strong multipath effects directly, then no additional processing is needed, but the signal-to-noise ratio takes too long to achieve usable levels
Solution Approach 1:
The patent applies preliminary action by computing channel impulse response estimation from the received signal and using this estimation to configure the pre-filter before the main equalization process begins. This preliminary channel characterization allows the pre-filter to be properly configured to mitigate specific multipath effects present in the channel, thereby improving the signal-to-noise ratio more rapidly at the input of the main equalizer.
Data Source
AI summary
A receiving apparatus applied to a receiving end of a communication device having an equalizer is provided. The receiving apparatus includes a filter and a channel estimator. The filter filters a received signal to reduce a multipath effect of the received signal and outputs a filtered signal. The channel estimator performs channel estimation on the received signal to generate an estimation result. The estimation result is for determining which of the received signal and the filtered signal is to be selected and sent to the equalizer.