Signal Processing Method for Spectrum Resource Utilization
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Solution Overview
Problem
Existing signal processing methods in the Internet of Vehicles system require increasing the number of subcarriers and OFDM symbols to transmit complete data signals, leading to low utilization rates of spectrum resources.
Innovation Solution
A signal processing method and apparatus that divide data bits into multiple sub-data signals based on preset pilot sequences, determine target insertion positions for pilot sequences in a frequency-domain signal, and combine these with data signals to generate a pulse signal, allowing for efficient spectrum resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of subcarriers and OFDM symbols is increased to transmit complete data signals, then the data transmission completeness is improved, but the spectrum resource utilization rate deteriorates
Solution Approach 1:
The data signal is segmented into multiple sub-data signals, with different portions mapped to different subcarriers. Pilot sequences are inserted at specific positions to enable reliable reconstruction of the complete data signal without requiring an increase in the total number of subcarriers and OFDM symbols, thus maintaining spectrum resource utilization while ensuring data transmission completeness.
Solution Approach 2:
The patent utilizes the time-frequency domain by inserting pilot sequences at specific positions in the frequency-domain signal. This dimensional approach allows the receiver to recover complete data information through correlation processing and interpolation, achieving complete data transmission without increasing spectral resources.
2Measurement precision
If pilot sequences are inserted at specific positions in the frequency-domain signal, then the data signal reconstruction accuracy is improved, but the complexity of signal processing increases
Solution Approach 1:
Pilot sequences are pre-inserted at specific positions in the frequency-domain signal before inverse fast discrete Fourier transform. This preliminary action provides reference information that enables accurate data signal reconstruction at the receiver through correlation processing, improving reconstruction accuracy while maintaining manageable processing complexity through standardized insertion patterns.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables the transmission of complete data signals without increasing the number of subcarriers and OFDM symbols, thereby improving the utilization rate of spectrum resources.
Implementation Method 1
perform inverse fast discrete Fourier transform on the first frequency-domain signal, to obtain a pulse signal
Implementation Method 2
perform discrete Fourier transform on the pulse signal, to obtain a frequency-domain signal corresponding to the pulse signal as the first frequency-domain signal
Implementation Method 3
perform correlation processing on the subcarrier and the pilot sequences stored locally in the second device, to obtain a vector corresponding to the subcarrier as a target vector
Data Source
AI summary
Embodiments of the present invention provide a signal processing method and apparatus, a first device determines a target insertion position of a pilot sequence in a first frequency-domain signal based on the data bits in a first sub-data signal obtained by dividing data bits in a data signal, combines the pilot sequences with a second sub-data signal obtained by dividing the data signal according to the determined target insertion positions, to obtain the first frequency-domain signal; sends the pulse signal corresponding to the first frequency-domain signal to the second device. The second device determines the pilot sequences in the first frequency-domain signal corresponding to the pulse signal and determines the data bits corresponding to the insertion position of each of the pilot sequences in the first frequency-domain signal, to obtain the first sub-data signal; demodulates subcarriers in the first frequency-domain signal other than the pilot sequences, to obtain the second sub-data signal; splices the first sub-data signal and the second sub-data signal, to obtain the corresponding data signal. Based on the above processing, spectrum resource utilization rate can be improved.