mdft filter bank multi-carrier frequency modulation system and its optimal design method
A filter bank, MDFT technology, applied in the field of multi-carrier frequency modulation system and its optimization design, can solve the problems of increasing system transmission delay, reducing stopband attenuation and frequency resolution, etc., to achieve improved anti-error performance, The effect of reducing system bit error rate and improving spectrum utilization
Active Publication Date: 2016-03-23
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology
When the length increases, the improvement is more obvious, but the increase of the length will increase the transmission delay of the system, and the increase of the roll-off coefficient will reduce the stop band attenuation and frequency resolution, so the prototype function of the MDFT filter bank needs to be optimized
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[0025] The technical solution adopted in the present invention is to obtain the number of MDFT filter bank channels M, and calculate the square root raised cosine function length according to the formula: L=N*M, wherein, N is a length factor; according to N, r value, calculate the square root raised cosine function Coefficient h (n); According to square root raised cosine function coefficient h (n), design MDFT filter bank, realize MDFT filter bank multi-carrier frequency modulation system, and calculate the bit error rate of MDFT filter bank multi-carrier frequency modulation system; Compare the MDFT system bit error rate (MDFT_SER) and OFDM system bit error rate (OFDM_SER); find the N, r value that satisfies MDFT_SER-OFDM_SER<0; the optimal N, r value; bring the optimal N, r value into The prototype function h(n) of the MDFT filter bank multi-carrier frequency modulation system that meets the design requirements is obtained from the calculation formula of the square root rais...
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The invention discloses an optimized method of an MDFT filter bank multi-carrier-frequency modulating system, and relates to the design of multi-carrier-frequency modulating systems. According to the design, a prototype function (a square root raised cosine function) is used as an objective function, and the bit error rate of the system is a constraint condition. Due to the fact that the square root raised cosine function is designed in an optimized mode, compared with an OFDM multi-carrier-frequency modulating system, the MDFT filter bank multi-carrier-frequency modulating system has the better performance, and particularly in the high-speed data transmission. Compared with the OFDM system, the MDFT filter bank multi-carrier-frequency modulating system has the advantage of remarkably improving the bit error resistance performance.
Description
technical field [0001] The invention relates to a multi-carrier frequency modulation system, in particular to a multi-carrier frequency modulation system based on an MDFT filter bank and its optimal design. Background technique [0002] Multi-carrier frequency modulation technology is to convert the input signal into multiple parallel signals, and modulate a group of carriers that are completely orthogonal to each other. The early multi-carrier frequency modulation technology is based on the traditional discrete Fourier transform (DFT). Although the DFT-based multi-carrier frequency modulation system has many advantages, it has an inherent defect, namely, low frequency resolution and inter-band interference. Big. Therefore, the requirement for high resolution of the modulation system has produced a multi-carrier frequency modulation system based on filter banks. In the application of filter banks, modulated filter banks are more widely used because of their simple design a...
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IPC IPC(8): H03D7/16
Inventor 王光宇邵凯庄陵
Owner CHONGQING UNIV OF POSTS & TELECOMM