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Inverse Fourier transformation algorithm applied to NB-IoT (Narrow Band Internet of Things)

A technology of Fourier inverse transform and algorithm, applied in the direction of digital transmission system, electrical components, modulated carrier system, etc., can solve the problems of waste of resources, etc., and achieve the effect of reducing usage, improving utilization rate, and low processing delay

Inactive Publication Date: 2018-06-01
SYSU HUADU IND SCI & TECH INST +1
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Problems solved by technology

In order to meet the timing requirements of the 4G network, the NB-IoT standard must use 128 points or more IFFT to realize the transformation from the frequency domain to the time domain, while NB-IoT only uses 12 of the 128 subcarriers, which is realized by traditional FFT The 128-point IFFT method applied to NB-IoT will cause waste of resources and is not suitable

Method used

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Embodiment 1

[0024] An inverse Fourier transform algorithm applied to NB-IoT, comprising the following steps:

[0025] S1: The data to be processed is input to the input control module for data conjugate operation and serial-to-parallel conversion;

[0026] S2: The converted data is input to the shift addition and subtraction operation module for multiplication and addition of the data and the twiddle factor;

[0027] S3: The data processed in step S2 are output to 12 output control modules each time for addition and taking the conjugate sum and dividing by N, and then output the data calculated by inverse Fourier transform.

[0028] Further, the specific process of the step S2 is:

[0029] 1) Divide every 12 data into 7 groups, in which the mapped positions of the two data in the paired 5 groups are symmetrical, and the two rotation factors multiplied with it are conjugated to each other, using the conjugate characteristics, share a set of twiddle factors, multiplex multipliers, and the...

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Abstract

The invention provides an inverse Fourier transformation algorithm applied to NB-IoT (Narrow Band Internet of Things). The algorithm is characterized in that the characteristics of an implementation method for realizing mapping of 12 sub-carriers of the NB-IoT to 128-point IDFT (Inverse Discrete Fourier Transformation) are analyzed, and available information in each output is decomposed to optimize a processing process. The regularity of rotation factors is utilized, and shifting and adding methods are used, so that the utilization rate of hardware resources is increased; the use of a multiplier is reduced; the hardware area can be saved greatly; and the power consumption of an inverse Fourier transformation device is lowered. More importantly, compared with a conventional N-point IFFT (Inverse Fast Fourier Transformation) module, the inverse Fourier transformation algorithm can realize lower inverse Fourier transformation processing delay when being applied to the NB-IoT.

Description

technical field [0001] The present invention relates to the field of Fourier transform algorithm in digital signal processing technology, and more specifically, relates to an inverse Fourier transform algorithm applied to NB-IoT. Background technique [0002] In modern wireless communication systems, Orthogonal Frequency Division Multiplexing (OFDM) is the most commonly used modulation technique. It is also a special multi-carrier transmission scheme, and its basic idea is to adopt frequency division multiplexing (FDM) technology that allows sub-channel spectrum to overlap without mutual influence. The communication system using OFDM technology has the advantages of high spectrum utilization rate, strong anti-impulse noise and anti-multipath fading ability. Among them, the fast Fourier transform (FFT, Fast Fourier Transformation) algorithm is the key technology to realize OFDM. The fast Fourier transform algorithm was proposed by J.W.Cooley and T.W.Tukey in 1965, the purpos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/263
Inventor 陆许明徐永键张家浩
Owner SYSU HUADU IND SCI & TECH INST
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