Comb Interlacing DFT-Spread Data and Reference Signals
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in efficiently processing reference and data signals for uplink transmission, which affects spectral efficiency and interference management in multi-user environments.
Innovation Solution
The implementation of separate discrete Fourier transform (DFT) processing and tone mapping for reference signals and data in orthogonal frequency division multiplexing (OFDM) symbols, allowing for comb interlacing that enables frequency division multiplexing while reducing Peak to Average Power Ratio (PAPR).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate DFT processing and tone mapping is implemented for reference signals and data, then spectral efficiency is improved through FDM, but device complexity increases due to additional processing steps
Solution Approach 1:
The patent segments the signal processing into separate DFT processing paths for reference signals and data, with distinct tone mapping operations. This segmentation enables frequency division multiplexing by placing reference signals and data in different frequency subsets, thereby improving spectral efficiency while managing complexity through modular processing stages
Solution Approach 2:
The patent transitions from time-domain multiplexing to frequency-domain multiplexing by applying separate DFT processing and tone mapping. This dimensional change from time to frequency domain allows simultaneous transmission of reference signals and data in the same time slot but different frequency resources, improving spectral efficiency
2Object-affected harmful factors
If comb interlacing is used for FDM of reference and data signals, then interference is reduced, but the PAPR management becomes more challenging
Solution Approach 1:
The patent applies local quality by assigning different signal characteristics to different frequency subsets. Reference signals are placed in even-indexed subcarriers while data is placed in odd-indexed subcarriers, creating locally optimized frequency assignments that reduce interference between reference signals and data while managing PAPR through distributed frequency placement
3Quantity of substance
If multiple access technologies are used to support multiple users, then system capacity increases, but resource allocation complexity increases
Solution Approach 1:
The patent implements a universal resource allocation framework where the comb interlacing structure can simultaneously support multiple users with different requirements. The same frequency division structure serves both reference signal transmission and data transmission for multiple users, reducing overall system complexity while increasing capacity
Data Source
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AI summary
Certain aspects of the present disclosure provide techniques for processing reference and data signals for uplink transmission. A method is provided for wireless communications. The method generally includes obtaining different sets of samples for at least one of: a data signal or a reference signal; spreading the different sets of samples for the at least one data signal or reference signal using separate discrete Fourier transform (DFT) processing blocks; interlacing the spreaded sets of samples by assigning the spreaded sets of samples from each of the separate DFT processing blocks to equally spaced tones; and transmitting the at least one data signal or reference signal on the assigned tones in an orthogonal frequency division multiplexed (OFDM) symbol.