Interference Alleviation Equalizing Apparatus for Multi-Carrier Systems
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Solution Overview
Problem
Conventional multi-carrier communication systems face errors in channel estimation due to accidental interference, leading to inaccurate equalized signals, which affect the receiver's performance.
Innovation Solution
An apparatus and method that include a channel estimator, an interference power estimation circuit, and an equalization circuit to generate a channel response value and interference power estimate, using a hard decision value, to improve the accuracy of the equalized signal and enhance error resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional channel estimation is used to generate channel estimation values from preamble symbols, then the channel response can be obtained, but the channel estimation values will have serious errors when accidental interference occurs during the estimation operation
Solution Approach 1:
The patent implements a feedback mechanism where the equalized signal is fed back to update the interference power estimate. The equalized signal is obtained by subtracting the estimated interference from the received signal, and this equalized signal is then used to recalculate the interference power estimate, creating a closed-loop feedback system that progressively refines the interference estimation and improves channel estimation accuracy
Solution Approach 2:
The patent performs preliminary interference power estimation before channel estimation and equalization. By first estimating the interference power from the received signal and preamble symbols, the system can subtract this interference component beforehand, thereby improving the accuracy of subsequent channel estimation operations and preventing interference from corrupting the channel estimation values
2Productivity
If channel estimation value is used to equalize the received signal, then the equalized signal can be generated, but the equalized signal will be inaccurate when the channel estimation value contains errors due to interference
Solution Approach 1:
The patent introduces an interference power estimate as an intermediary element between the received signal and the channel estimation process. This intermediary represents the interference component that mediates the relationship between the noisy received signal and the clean channel estimation, allowing the system to separate and handle interference independently before performing equalization
Solution Approach 2:
The patent extracts the interference component from the received signal by estimating its power based on preamble symbols and signal statistics. This extracted interference estimate is then subtracted from the received signal to produce a cleaned version for channel estimation, effectively removing the harmful interference component before it can corrupt the channel estimation values
Data Source
AI summary
An apparatus and a method for equalizing a received signal to generate an equalized signal are disclosed. The apparatus includes a channel estimator for generating a channel estimation value according to a preamble symbol in the received signal and for generating a channel response value according to the channel estimation value, an interference power estimation circuit for generating an interference power estimate according to a hard decision value, the channel response value, and the received signal, and an equalization circuit for equalizing the received signal according to the channel response value and the adjusted interference power estimate to generate the equalized signal. The hard decision value corresponds to the equalized signal.