Communication Apparatus Delay Wave Detection for Transmission Path Estimation
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Solution Overview
Problem
Conventional transmission path estimation methods in wireless communication often fail to detect delay waves before pilot signal extraction, leading to decreased accuracy.
Innovation Solution
A communication apparatus comprising a despreading unit, signal detection unit, delay amount estimation unit, pilot signal extraction unit, spreading unit, and transmission path estimation unit, which performs direct spread processing and estimation to improve transmission path accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional transmission path estimation method using pilot signals is used, then the transmission path estimation can be performed, but delay waves may fail to be detected and transmission path estimation accuracy decreases
Solution Approach 1:
The signal detection unit performs detection of delay waves before the pilot signal extraction unit extracts the pilot signal. This preliminary detection ensures that delay waves are identified and accounted for prior to pilot signal processing, preventing missed detections and improving overall transmission path estimation accuracy.
2Measurement precision
If direct spread processing is applied to pilot signals, then transmission path estimation accuracy improves, but device complexity increases
Solution Approach 1:
The signal processing is divided into distinct functional units: a despreading unit that performs despreading processing on received signals, a signal detection unit that detects delay waves, a pilot signal extraction unit that extracts pilot signals, and a transmission path estimation unit that estimates transmission paths. This segmentation allows each unit to perform its specific function efficiently, improving overall accuracy while managing complexity through modular design.
Data Source
AI summary
A communication apparatus includes: a despreading unit that performs despreading processing on a received signal subjected to direct spread processing; a signal detection unit that detects a plurality of signals included in the received signal subjected to the despreading processing; a delay amount estimation unit that estimates an amount of delay in each of the plurality of detected signals; a pilot signal extraction unit that extracts a subcarrier including a pilot signal from the received signal based on the estimated amounts of delay; a spreading unit that performs direct spread processing on the extracted pilot signal by using a spreading sequence used by a source of transmission of the received signal for performing direct spread processing; and a transmission path estimation processing unit that performs transmission path estimation processing based on the pilot signal subjected to the direct spread processing.