Receiving Apparatus Channel Estimation for Wireless Signals
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Solution Overview
Problem
Conventional wireless communication systems face challenges in achieving equal reception performance for data signals and control signals, despite processing control signals to enhance reception performance, due to channel estimation errors caused by fluctuations in high-speed mobile environments.
Innovation Solution
A receiving apparatus that estimates channels for both control and data signals using pilot signals and replicas, performing frequency domain equalization to improve signal reception, allowing for separate and efficient channel estimation and processing of control and data signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control signals are processed with error-correction codes and repetition processing to increase redundancy, then reception performance of control signals is improved, but transmission efficiency is reduced
Solution Approach 1:
The patent applies error-correction codes and repetition processing selectively only to control signals, not to data signals. This partial application of redundancy processing ensures that control signals achieve high reception performance while data signals maintain transmission efficiency, thus resolving the contradiction between reliability and productivity.
2Reliability
If SC-FDMA pilot symbols are inserted at a high rate and SC-FDMA data symbols are disposed near pilot symbols, then reception performance of data symbols is improved, but transmission efficiency is reduced
Solution Approach 1:
The patent performs frequency domain equalization selectively only for control signals, not for data signals. This partial application of equalization processing improves the reception performance of control signals while maintaining transmission efficiency for data signals, thus resolving the contradiction between reliability and productivity.
3Measurement precision
If control signals are assigned to symbol positions adjacent to pilot signals, then channel estimation error is reduced and control signal detection performance is improved, but the complexity of signal arrangement increases
Solution Approach 1:
The patent performs frequency domain equalization selectively only for control signals that are assigned to specific symbol positions adjacent to pilot signals. This localized equalization processing improves channel estimation accuracy for control signals without applying complex processing to all signals, thus resolving the contradiction between measurement precision and device complexity.
Data Source
AI summary
A receiving apparatus includes: a control signal channel estimator to estimate a channel for a control signal using a pilot signal extracted from a received signal, and generate a first channel estimate value; a control signal FED unit to perform frequency domain equalization processing on the control signal by using the first channel estimate value; a control signal demodulator to demodulate the equalized control signal; a control signal encoder to encode a demodulated equalized control signal; an FFT unit to generate, from the encoded equalized control signal, a control signal replica; a data channel estimator to estimate a channel for the data signal by using the control signal replica and the first channel estimate value; and a data FDE unit to perform frequency domain equalization processing on the data signal by using the second channel estimate value.