Method for generating random access pilot in low complexity in long term evolution system

A technology of random access preamble and long-term evolution system, which is applied in transmission systems, digital transmission systems, modulated carrier systems, etc.

Inactive Publication Date: 2010-09-01
新奇点智能科技集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the perspective of IDFT implementation complexity, this method requires a lot of calculations, which increases the computational complexity of the client.

Method used

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  • Method for generating random access pilot in low complexity in long term evolution system
  • Method for generating random access pilot in low complexity in long term evolution system
  • Method for generating random access pilot in low complexity in long term evolution system

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Embodiment 1

[0053] Set the preamble format to 0, the system bandwidth to 20M, u=710,C v =119, And according to LTE technical standards 36.211 and 36.101, Table 1-4 can be obtained, and the values ​​of other parameters required for calculation can be found according to Table 1-4. For example, if the system has a bandwidth of 20M, the sampling rate of the system is 30.72M, and the CP time domain length of preamble format 0 is T CP =3168·T s , which has 307200·T s =10ms, then the corresponding cyclic prefix length N CP 30.72M×T CP = 3168 points.

[0054] Table 1: Random Access Preamble Length

[0055] leading format

Root sequence length N ZC

0-3

839

4

139

[0056] Table 2: Random access preamble parameters (wherein, 307200·T s =10ms)

[0057] leading format

Time domain CP length T CP

Time domain sequence length T SEQ

0

3168·T s

24576·T s

1

21024·T s

24576·T s

2

...

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Abstract

The invention discloses a method for generating a random access pilot in low complexity in a long term evolution system, which is characterized by comprising the following steps of: directly generating a frequency domain sequence with the length of NZC; through frequency offset treatment, performing zero-padding on the frequency domain sequence to a nonequispaced fast Fourier transform NFFT point; through cyclic shift, performing inverse fast Fourier transform, performing K-time oversampling, adding prefix and the suffix and delivering to a filter; and through the frequency offset shift, finally adding a cyclic prefix to generate the random access pilot. Compared with the conventional methods, the method for generating the random access pilot in low complexity in the long term evolution system greatly reduces the complexity; meanwhile, the realized result of the method is consistent with that of the conventional methods, and is more suitable for an actual system.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, in particular to the third generation mobile communication technology (3 rd A low-complexity generation method for a random access preamble in a long-term evolution (Long Time Evolution, LTE for short) system after Generation, referred to as 3G). Background technique [0002] The Third Generation Partnership Project (3GPP) rd Generation Partnership Project, 3GPP) is a standardization organization established in December 1998. The continuous growth of mobile data services has driven the 3GPP to develop the Long Term Evolution (LTE) specification. The UE implements access by sending a random access preamble on a physical random access channel (Physical Random Access Channel, PRACH). [0003] According to the technical standard 36.211 related to the LTE system, there are five random access preamble formats supported by the LTE system, and the PRACH occupies six consecutive resource...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B7/26H04W74/08
CPCH04L27/2613H04L27/2633
Inventor 李亮陈伟朱近康邱玲
Owner 新奇点智能科技集团有限公司
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