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Generation method and device for physical random accessing channel baseband signal

A physical random access, baseband signal technology, applied in the transmitter/receiver shaping network, baseband system components, digital transmission system, etc., can solve problems such as high complexity, increase storage space, etc., to reduce computing amount of effect

Active Publication Date: 2014-01-15
LEADCORE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the factor is calculated in real time, due to the trigonometric functions involved, the calculation of N IFFT The complexity of this factor is quite high; if the storage table is used, a lot of additional storage space needs to be added

Method used

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  • Generation method and device for physical random accessing channel baseband signal
  • Generation method and device for physical random accessing channel baseband signal
  • Generation method and device for physical random accessing channel baseband signal

Examples

Experimental program
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no. 1 example

[0066] Figure 4 A flow chart of a physical random access channel (PRACH) digital baseband signal method according to an embodiment of the present invention is shown. refer to Figure 4 As shown, the process is as follows:

[0067] Zadoff-Chu (ZC) root sequence generation is first performed at step 401 . Here, the ZC root sequence corresponding to the PRACH can be generated according to the 3GPP TS36.211 specification.

[0068] Then in step 402, perform N on the ZC sequence ZC Point Discrete Fourier Transform (DFT). For example, perform 839-point or 139-point DFT transformation on the ZC sequence. Here, although 839 and 139 are both prime numbers, it is not convenient to do fast Fourier transform, but the paper S.Beyme and C.Leung "Efficient computation of DFT of Zadoff-Chu sequences" pointed out that there is a simplified calculation of DFT of prime number points of ZC sequence method can be used.

[0069] In step 403, subcarrier mapping and zero padding are performed ...

no. 2 example

[0113] Figure 6 A flow chart of a physical random access channel (PRACH) digital baseband signal method according to the second embodiment of the present invention is shown. refer to Figure 6 As shown, steps 601-604 are the same as steps 401-404 and will not be described here.

[0114] The characteristic of this embodiment is that, since the final output data of the PRACH is a cyclic prefix part, a data part, and a possible repeated data part in sequence, the cyclic prefix part is the repetition of the last part of the data. In order to reduce data storage, the last part of data corresponding to the cyclic prefix part of the first spectrum shift 605 may first be sequentially subjected to oversampling filtering 606 and second spectrum shift 607, so as to generate the cyclic prefix part first. Then, the data after the first spectral shift 605 are sequentially subjected to oversampling filtering 606 and second spectral shift 607 from the beginning to generate data sequentiall...

no. 3 example

[0127] In this embodiment, the first spectrum shift can also be implemented in the frequency domain. For example, a first spectrum shift can be incorporated into the subcarrier mapping and zero padding steps. Figure 8 A flow chart of a method for generating a PRACH digital baseband signal according to the third embodiment of the present invention is shown. refer to Figure 8 As shown, steps 801-802 are the same as steps 401-402 and will not be described here.

[0128] In step 803, subcarrier mapping and zero padding are performed on the DFT output sequence, and the first spectrum shift is performed during this process. Specifically, the offset of the first spectrum shift is included in subcarrier mapping.

[0129] Here, let the DFT output sequence be z RA (n), Through zero padding and data moving processing, the mapping of subcarriers in the frequency domain and data arrangement before IFFT are completed, and the output length is the sequence of:

[0130] ...

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Abstract

The invention relates to a generation method and device for a physical random accessing channel baseband signal. The generation method and device for the physical random accessing channel baseband signal can significantly reduce computation complexity and memory space. The method comprises the steps that a ZC root sequence corresponding to a physical random access channel is generated; the discrete Fourier transform is conducted on the ZC root sequence; subcarrier mapping and zero-filling are conducted on the output sequence of the discrete Fourier transform; the rapid inverse Fourier transform is conducted on the sequence after the mapping and zero-filling; first frequency spectrum shift is conducted on the sequence after the rapid inverse Fourier transform; sampling and filtering are conducted on the data after the conduction of the first frequency spectrum shift; second frequency spectrum shift is conducted on the data after sampling and filtering, wherein the rotation factor of the second frequency spectrum shift is the same as the rotation factor of the rapid Fourier transform with the length being Nsys.

Description

technical field [0001] The present invention relates to a long term evolution (Long term Evolution, LTE) system, in particular to a method and device for generating a physical random access channel (Physical Random Access Channel, PRACH) baseband signal in the LTE system. Background technique [0002] The physical layer of LTE is based on Orthogonal Frequency Division Multiplexing (OFDM) technology, the subcarrier width is Δf=15KHz, and the maximum supported bandwidth is 20MHz. In the time domain, the basic unit of time is T s =1 / (15000×2048)s means. Among them, 15000 is a subcarrier width Δf, and 2048 is the number of IFFT points for realizing data frequency domain to time domain transformation at the maximum bandwidth. [0003] In order to realize user equipment (User Equipment, UE) access, a wireless communication system needs to provide a Random Access Channel (RACH, Random Access Channel). RACH is a contention-based uplink channel, and in different wireless systems, ...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04L25/03
Inventor 徐兵王乃博
Owner LEADCORE TECH
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