Power line broadband carrier semi-parallel transmitter and realization method thereof

Abstract

The invention relates to a power line broadband carrier semi-parallel transmitter, comprising a discrete cosine transform DCT module which is use for transforming a real signal, wherein the signal after transformation in a frequency domain is also the real signal; a matrix module, wherein M outputs of the discrete cosine transform DCT module are multiplied with two matrixes, so 2M mutually orthogonal output signals can be obtained, and a peak-to-average power ratio of the signals is reduced; and a multiphase filter, wherein a high-order FIR filter is replaced by a plurality of low-order FIR filters, and the calculation quantity is reduced, and the adjacent channel interference is inhibited. The invention also discloses a realization method of the power line broadband carrier semi-parallel transmitter. According to the power line broadband carrier semi-parallel transmitter and the method, through utilization of the energy concentration characteristic of DCT, the operation quantity is greatly reduced, and real-time data processing is realized. The peak-to-average power ratio of OFDM (Orthogonal Frequency Division Multiplexing) signals is reduced, and the adjacent channel interference is inhibited. Resource sharing is facilitated, namely, a plurality of subcarriers can be realized on the same FPGA device, so parallel data processing is realized, and the optimum balance between resource consumption and a resource utilization rate is realized.

Description

Technical field [0001] The invention relates to the technical field of electricity consumption information collection, in particular to a power line broadband carrier semi-parallel transmitter and an implementation method thereof. Background technique [0002] With its ease of implementation, high broadband efficiency, ability to eliminate multipath distortion and simplify the frequency domain equalizer, OFDM (Orthogonal Frequency Division Multiplexing) technology is playing a role in broadband wired and wireless digital communications. Important role. Because DFT (Discrete Fourier Transform)-based systems are particularly sensitive to frequency synchronization errors, their performance is severely degraded in a noisy environment, and OFDM has disadvantages such as higher frequency synchronization requirements and relatively large peak-to-average power. FBMC (Filter Bank Multi-Carrier, filter bank multi-carrier) has a large spectrum separation on the sub-carriers carrying transm...

AI Technical Summary

Problems solved by technology

Since the system based on DFT (Discrete Fourier Transform) is particularly sensitive to frequency synchronization errors, its performance is severely degraded in noisy environments, and OFDM has shortcomings such as high requirements for frequency synchronization and relatively large peak-to-average power.

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