Channel Estimation for OFDM Single Carrier Systems
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Solution Overview
Problem
Current channel estimation methods in 5G communication systems require Fast Fourier Transform (FFT) operations and are not efficient for processing the entire frequency band, limiting their ability to provide accurate channel state information without significant computational resources.
Innovation Solution
A method and apparatus for channel estimation that processes signals in the time domain without FFT operations, using channel state information-reference signals (CSI-RS) transmitted through a partial band of the entire frequency band, allowing for estimation of the entire frequency band's channel state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If FFT operations are used for channel estimation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the frequency band into multiple partial bands and performs channel estimation separately for each band using time-domain processing. This segmentation allows the system to achieve accurate channel state information for the entire frequency band while avoiding the need for complex FFT operations across the full band, thereby reducing computational complexity.
Solution Approach 2:
The patent transmits CSI-RS signals through only a partial band of the entire frequency band rather than the full band. By performing channel estimation on this partial band and extrapolating to the entire frequency band, the system achieves sufficient measurement precision while significantly reducing the computational burden compared to processing the entire band with FFT.
2Measurement precision
If channel estimation is performed on the entire frequency band, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The patent extracts and processes only the essential channel state information from a partial frequency band using time-domain signal processing. By extracting the key channel characteristics from a reduced bandwidth and using these to represent the entire frequency band, the system maintains measurement precision while reducing the energy required for computation.
Solution Approach 2:
The patent performs channel estimation on a partial band rather than the entire frequency band. This partial action approach provides sufficient channel state information for effective communication while significantly reducing the computational energy required compared to processing the complete frequency band.
3Device complexity
If time domain processing is used instead of FFT, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent segments the frequency band into multiple partial bands and applies time-domain processing to each segment. This segmentation strategy allows time-domain methods to achieve measurement precision comparable to FFT by processing smaller, manageable frequency portions separately, thereby reducing device complexity while maintaining accuracy.
Data Source
AI summary
The disclosure relates to a communication technique that converges a 5G communication system to support a higher data rate after a 4th Generation (4G) system with Internet of Things (IoT) technology, and a system thereof. The disclosure can be applied to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, security and safety related services, or the like) based on 5th Generation (5G) communication technology and IoT related technology. In addition, the disclosure provides a method and an apparatus for reducing user equipment (UE) power consumption in a wireless communication system.