Compressive Sampling Receiver Precoding for Higher SINR
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Compressive sampling methods for multi-band signals in radio communications suffer from mutual interference due to frequency mixing, resulting in a low Signal to Interference plus Noise Ratio (SINR) and poor signal restoration.
Innovation Solution
A signal processing method involving a precoding matrix D, derived from a periodic pseudo random sequence, is used to precode information symbols before transmission, ensuring orthogonality between signals and reducing interference by shifting spectrums of information symbols to the same frequency band, thereby increasing the SINR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If compressive sampling is used to reduce sampling rate requirements, then ADC complexity and cost are reduced, but signal restoration quality deteriorates due to mutual interference
Solution Approach 1:
The patent applies preliminary action by performing precoding on the transmitted signal before compression sampling. The precoding matrix is designed in advance based on the periodic pseudo-random sequence to ensure that after frequency mixing and compression sampling, the signals from different subbands remain orthogonal. This preliminary structuring of the signal prevents mutual interference from occurring in the first place, thereby maintaining high signal restoration quality while enabling the use of low-rate ADCs
Solution Approach 2:
The patent changes the parameter of the transmitted signal by applying a precoding transformation. The original signal is multiplied by a precoding matrix constructed from the periodic pseudo-random sequence, which transforms the signal into a form that is optimized for compressive sampling. This parameter transformation ensures that the signal's spectral properties align with the sampling process, preventing interference and enabling accurate reconstruction despite reduced sampling rates
2Productivity
If multiple spectral subbands are aggregated to increase bandwidth utilization, then spectral efficiency is improved, but terminal design complexity increases due to multiple frequency converters and filters
Solution Approach 1:
The patent merges the processing of multiple spectral subbands into a single unified process. Instead of using separate frequency converters and filters for each subband, the system uses a single compression sampling channel that processes all subbands simultaneously. The precoding matrix combines information from all subbands in a way that preserves their individual characteristics while enabling joint processing, thereby achieving high spectral efficiency without increasing terminal complexity
3Adaptability or versatility
If dynamic change of subband frequency is implemented to adapt to varying signal conditions, then system adaptability is improved, but hardware requirements increase due to limited terminal size
Solution Approach 1:
The patent implements dynamics by making the precoding matrix adaptive to changing signal conditions. The precoding matrix is constructed based on the periodic pseudo-random sequence, which can be dynamically adjusted to match the current spectral occupancy and signal characteristics. This allows the system to adapt to varying subband frequencies and signal conditions without requiring hardware changes, maintaining high adaptability within compact terminal dimensions
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Embodiments of the present invention provide a signal processing method, a transmitter, and a compressive sampling receiving device. The method includes: obtaining a periodic pseudo random sequence used when a compressive sampling receiving device performs frequency mixing; selecting 2N information symbols from N radio signals; determining a precoding matrix D according to the periodic pseudo random sequence; using the precoding matrix to perform precoding processing on the 2N information symbols to obtain 2N precoding results; and separately transmitting the 2N precoding results to the compressive sampling receiving device by using the 2N carriers. In the embodiments of the present invention, precoding processing is performed on to-be-transmitted information symbols by using a precoding matrix, thereby implementing orthogonality between the information symbols on an aliased frequency band when a compressive sampling receiving device aliases spectrums of the information symbols, avoiding interference between the information symbols, and increasing an SINR of a received signal.