System and method for modulating frequency domain of block transmission system based on filter set

Abstract

The invention provides a system and a method for modulating frequency domain of a block transmission system based on a wave filter set. The method comprises the following: firstly, an inputted serial modulating symbol sequence is divided into D data block sequences, with a length of K for each, the K point orthogonal transformation is performed; secondly, K elements outputted by each orthogonal transformation are respectively mapped to the K subbelts distributed by the system to transmit by the subbelt mapping; thirdly, the D point DFT transformation is performed on the data block with a length of D transmitted on each subbelt, the data block with a length of D*N is expanded in cycle; fourthly, the K data blocks with a length of D*N are respectively multiplied by corresponding spectral window functions on eachbelt to perform the frequency spectrum forming and the data block accumulation so as to form a data block with a length of D*N; and finally, the D*N point inverse Fourier transform to the data block is performed and the cyclic prefix is added to transmit the processed data block, thereby reducing the complexity on the condition of keeping the performance, particularly on the condition that the number of the distributed sub belts is small such as an upstream link circuit.

Description

technical field [0001] The invention relates to a frequency domain modulation system and method of a block transmission system based on a filter bank. Background technique [0002] In recent years, with the rapid development of wireless communication systems towards broadband, the bandwidth occupied by wireless communication systems is getting higher and higher, the transmission rate is getting higher and higher, and the spectral efficiency is also required to be higher and higher. When multiple users access simultaneously in broadband wireless mobile communication systems and broadband wireless access networks, it is necessary to use multiple access technology. There are three main types of multiple access technologies commonly used: frequency division multiple access, time division multiple access, and code division multiple access. Frequency division multiple access technology is to allocate user information to carrier channels of different frequencies for transmission; ...

AI Technical Summary

Problems solved by technology

It can be seen that for the time-domain filter bank modulation structure, the multi-subband spectrum shaping and the multiplexing (shift accumulation) of D waveform symbols are completed in the time domain. characteristics, the filter bank prototype has a large number of filter coefficients, therefore, time-domain spectral shaping and symbol multiplexing will lead to large implementation / computational complexity

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