SC-FDE Pilot Symbol Placement for Channel Estimation
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Solution Overview
Problem
In high-speed mobile communication environments, existing single carrier frequency domain equalizer (SC-FDE) systems face challenges in accurately estimating channel conditions due to rapid channel changes, leading to reduced data reception performance.
Innovation Solution
The proposed solution involves an SC-FDE-based transmission and reception method where a pilot symbol is placed between the first and second data symbols within the SC-FDE frame, allowing for more accurate channel estimation and compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pilot symbol is placed at the beginning of the SC-FDE frame in existing systems, then channel estimation can be performed, but in high-speed mobile environments with rapid channel changes, the channel estimation accuracy deteriorates because the pilot symbol is too far from the data symbols in time
Solution Approach 1:
The patent divides the data symbols into first data symbols and second data symbols, and places a pilot symbol between them. This segmentation allows for multiple channel estimation points within the same frame, enabling the receiver to track rapid channel changes in high-speed mobile environments while maintaining accurate data reception performance throughout the entire frame duration
Solution Approach 2:
The patent performs preliminary channel estimation using the pilot symbol positioned between the first and second data symbols. This intermediate pilot symbol provides up-to-date channel information before the second data symbols are transmitted, allowing the receiver to compensate for channel variations that occur during frame transmission in high-speed mobile conditions
2Measurement precision
If the number of pilot symbols is increased to improve channel estimation in high-speed mobile environments, then channel tracking performance improves, but the number of data symbols transmitted per frame decreases
Solution Approach 1:
The patent uses a single pilot symbol positioned between the first and second data symbols, which is sufficient to track channel variations in high-speed mobile environments without excessively reducing the data transmission capacity. This partial action approach provides the necessary channel estimation accuracy while minimizing the impact on overall data throughput
3Measurement precision
If the frame structure is modified to include intermediate pilot symbols, then channel estimation accuracy in high-speed mobile environments improves, but the frame structure complexity increases
Solution Approach 1:
The patent introduces a pilot symbol only in the specific local position between the first and second data symbols, rather than uniformly distributing multiple pilot symbols throughout the frame. This localized approach provides targeted channel estimation capability where it is most needed for tracking rapid channel changes, while keeping the overall frame structure relatively simple and easy to implement
Data Source
AI summary
A transmission apparatus of a single carrier-based wireless communication system is proposed. The transmission apparatus may include a transceiver, a memory configured to store one or more instructions; and a processor configured to execute the one or more instructions stored in the memory. The processor may generate data symbols by modulating traffic data, generate a cyclic prefix (CP) on the basis of the data symbols, and generate a pilot symbol for the data symbol. The transceiver may transmit a single carrier frequency domain equalizer (SC-FDE) frame including the data symbol, the CP, and the pilot symbol. The data symbols may include first data symbols and second data symbols. The pilot symbol may be transmitted after transmission of the first data symbols and before transmission of the second data symbols.