Channel Estimation Circuitry for Time-Varying Wireless Channels
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Solution Overview
Problem
Existing methods for channel estimation in wireless communications systems with multiple transmit antennas face challenges in highly time-varying channels, leading to degradation in channel estimation quality and increased complexity, especially when using finite impulse response filters.
Innovation Solution
A method and circuitry for generating channel estimates by creating variables z1(k) and z2(k) from samples and symbol sequences, using filter coefficients to improve channel estimation, and simplifying FIR filtering to reduce complexity by combining filter coefficients and replicating samples for odd and even indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional channel estimation methods are used in highly time-varying channels, then channel estimation quality degrades, but the patent introduces a new variable generation method that maintains quality
Solution Approach 1:
The patent transforms the channel estimation problem by changing the parameters used in estimation. It introduces new variables z1(k) and z2(k) that are functions of consecutive signal samples and known symbols, rather than using conventional direct estimation methods. This parameter transformation enables accurate tracking of time-varying channel conditions by capturing channel variations between consecutive symbols.
2Measurement precision
If FIR filters are used for channel estimation, then estimation accuracy improves, but computational complexity increases
Solution Approach 1:
The patent segments the channel estimation process into distinct stages: generating variables from sample pairs, applying filter coefficients, and producing estimates. By dividing the received signal into pairs of consecutive samples and processing them through separate variable generation paths (z1 and z2), the method reduces the computational burden of FIR filtering while maintaining accuracy.
Solution Approach 2:
The patent performs preliminary processing by generating variables z1(k) and z2(k) from consecutive signal samples and known symbols before applying the FIR filter. This preliminary action transforms the raw signal into a form that is more suitable for filtering, reducing the complexity of the subsequent filtering operation while preserving channel estimation accuracy.
Data Source
AI summary
A method and system for generating channel estimates for processing signals received through first and second transmission channels in a wireless communications network, each channel corresponding to a separate transmit antenna, and each signal comprising a plurality of samples derived from symbols transmitted in the signal by: generating first variable z1 (k) and second variable z2 (k); and providing a set of filter coefficients (I) and generating first and second channel estimates using first and second variables and a set of filter coefficients.