DFT-s-OFDM Signal Processing Complexity Reduction
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Solution Overview
Problem
Current wireless communication systems face complexity in implementing transmission and reception devices due to the need for additional operations like FFT/IDFT, which increases implementation complexity and peak-to-average power ratio (PAPR) in mmWave systems.
Innovation Solution
The method involves using discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) with a DFT block size that is 1/N times the size of an IFFT block, where N is a natural number, and configuring the DFT block size based on the preset sampling frequency, allowing for reduced complexity in both transmitter and receiver implementations and lower PAPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DFT-s-OFDM with additional FFT/IDFT operations is used, then communication capacity and service support are improved, but device implementation complexity increases
Solution Approach 1:
The patent extracts and eliminates the unnecessary FFT/IDFT operations from the DFT-s-OFDM signal processing chain. By removing these redundant transform operations while retaining the essential DFT spreading functionality, the system maintains communication capacity without the added implementation complexity of multiple transform stages.
Solution Approach 2:
The patent changes the signal processing parameters by modifying the DFT block size relationship to be 1/N times the IFFT block size, where N is a natural number. This parameter adjustment allows the system to achieve the same communication functionality with simplified operations, directly reducing device complexity while maintaining adaptability.
2Reliability
If conventional DFT-s-OFDM with full-size DFT blocks is used, then signal processing capability is maintained, but PAPR increases in mmWave systems
Solution Approach 1:
The patent changes the DFT block size parameter to be 1/N times the IFFT block size, which directly controls the PAPR characteristic of the transmitted signal. This parameter modification reduces the peak-to-average power ratio while preserving the essential signal processing capability needed for reliable communication in mmWave systems.
3Productivity
If DFT block size is increased to match IFFT block size, then spectral efficiency is improved, but implementation complexity and PAPR worsen
Solution Approach 1:
The patent optimizes the DFT block size parameter to be 1/N times the IFFT block size, finding the optimal balance point where spectral efficiency is maintained through proper resource allocation while implementation complexity is reduced by avoiding full-size DFT blocks. This parameter relationship enables efficient signal processing with reduced computational burden.
Data Source
AI summary
Various embodiments relate to a next generation wireless communication system for supporting a higher data transmission rate, etcetera, than a 4th generation wireless (4G) communication system. Provided in various embodiments are a method for transmitting and receiving a signal in a wireless communication system and an apparatus supporting same, and various other embodiments may be provided.