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Discrete Fourier transform (DFT)/inverse discrete Fourier transform (IDFT) rotation factor control method, device and DFT/IDFT arithmetic device for long term evolution (LTE) system

A twiddle factor and IDFT technology, which is applied in the third generation mobile communication long-term evolution system DFT/IDFT twiddle factor control, DFT/IDFT computing device field, can solve the problem of affecting speed, not reaching the high speed of LTE system, large storage capacity, etc. problem, to achieve the effect of saving computing speed

Active Publication Date: 2015-04-15
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

It can be seen from Table 1 that there are 34 types of DFT / IDFT points in the LTE system, and there are at most 9 levels of DFT operations. If the twiddle factors of each level of each point are stored, the storage capacity is bound to be large. If the twiddle factors are generated in real time, then It will affect the speed of DFT / IDFT calculation, which cannot meet the high-speed requirements of LTE system

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  • Discrete Fourier transform (DFT)/inverse discrete Fourier transform (IDFT) rotation factor control method, device and DFT/IDFT arithmetic device for long term evolution (LTE) system
  • Discrete Fourier transform (DFT)/inverse discrete Fourier transform (IDFT) rotation factor control method, device and DFT/IDFT arithmetic device for long term evolution (LTE) system
  • Discrete Fourier transform (DFT)/inverse discrete Fourier transform (IDFT) rotation factor control method, device and DFT/IDFT arithmetic device for long term evolution (LTE) system

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Embodiment Construction

[0046] In order to make the purpose, technical solution and advantages of the present invention clearer, the DFT / IDFT twiddle factor control method, device and DFT / IDFT computing device of the LTE system of the present invention will be further described in detail in conjunction with the accompanying drawings and embodiments. The implementation manner is not described in detail to avoid unnecessary confusion with the content of the present invention.

[0047] Assuming that the number of DFT data points in Table 1 is N, the N point data is decomposed into k small points according to the mixed basis formula, and the product of k factors is obtained, which is expressed as N = Π i = 1 k f i , Among them, k is the maximum series of N point data processing; f i Indicates the basis of the i-th level DFT operation, which c...

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Abstract

The invention discloses a discrete Fourier transform (DFT) / inverse discrete Fourier transform (IDFT) rotation factor control method, a DFT / IDFT rotation factor control device and a DFT / IDFT arithmetic device for a long term evolution (LTE) system. In the method, 34 DFT / IDFT points of the LTE system can be represented by at least 10 great points, and the other points are characteristics of approximate numbers of a certain point of the at least 10 great points; only rotation factors of the at least 10 great points are stored, and the rotation factors of the 34 points are not required to be completely stored; when the rotation factors of each level are acquired, if arithmetic points belong to the stored great points, the stored rotation factors are directly read, and if the arithmetic points do not belong to the stored great points, the arithmetic points are converted into the corresponding great points and the stored rotation factors are read; and a DFT / IDFT computing mode is consistent with that of the prior art. Simultaneously, the invention also discloses a control device for implementing the method, and the DFT / IDFT arithmetic device. By the method and the devices, an arithmetic speed is not influenced, and simultaneously a storage space can be greatly saved.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to the DFT (Discrete Fourier Transform, Discrete Fourier Transform) / IDFT (Inverse Discrete Fourier Transform, Inverse Discrete Fourier Transform) twiddle factor of the third-generation mobile communication long-term evolution (LongTerm Evolution, referred to as LTE) system A control method, a device, and a DFT / IDFT computing device. Background technique [0002] At the end of 2004, the Third Generation Mobile Communication System Standardization Organization (hereinafter referred to as 3GPP) started the research and standardization work on LTE, and finally formed 36 series of protocol standards, which were frozen at the end of 2008. In the 3GPP TS 36.211-8.8.0 protocol, the LTE system physical uplink shared channel (Physical uplinkshared channel, referred to as PUSCH) adopts DFT-S-OFDMA (Discrete Fourier TransformSpread Orthogonal Frequency Division Multiple Access, DFT e...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L27/38
Inventor 韩佳佳陈娜沈静王茜竹
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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