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Pilot signal generating method and device and CDMA uplink synchronization method and device

A technology of pilot signal and frame signal, applied in the direction of synchronization device, wireless communication, multi-carrier system, etc., can solve the problems of limited length of a single pilot in distributed pilot, difficult channel estimation, unfavorable frequency offset estimation, etc., to achieve The effect of accurate and fast channel estimation

Active Publication Date: 2017-05-17
北京九天微星通信技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of this situation, centralized pilots are generally concentrated in a certain period of time, and it is difficult to accurately estimate channels with shorter coherence times
At the same time, when using pilots for frequency offset estimation, the accuracy of the estimated value is generally inversely proportional to the time interval of the pilot signal, and the centralized pilot generally has a limited duration, which is not conducive to obtaining a more accurate frequency offset estimate
The distributed pilot form can better solve the above problems, but the distributed pilot is faced with a single pilot length is limited, how to find the pilot sequence that meets the estimation requirements is an important problem

Method used

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  • Pilot signal generating method and device and CDMA uplink synchronization method and device
  • Pilot signal generating method and device and CDMA uplink synchronization method and device
  • Pilot signal generating method and device and CDMA uplink synchronization method and device

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Experimental program
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Embodiment 1

[0030] figure 1 It is a schematic flowchart of a pilot signal generation method provided in Embodiment 1 of the present invention. The method includes the following steps S110-step S120:

[0031] S110. According to the first matrix W=[Wa n Wa n …Wa n ] and scrambling code sequence P to obtain the single pilot signal of the i-th user equipment Among them, Wa n It is a Walsh matrix with n rows and n columns, W contains m Wa n Matrix, W i is the i-th row vector of W, P is a vector of n×m columns in one row, n is the user’s maximum spreading factor, n×m is the number of chips contained in each pilot signal, m, n and i are all positive Integer, and i≤n, operator defined as W i Multiply with point P.

[0032] Among them, the single pilot signal Pilot i The sequence length is shorter. For example, when the maximum spreading factor of the system is 8, that is, n is 8 chips, m is 1 or 2, that is, 1 or 2 symbols, and the pilot length is 8 or 16 chips. When the pilot signal ...

Embodiment 2

[0039] figure 2 It is a schematic flowchart of a code division multiple access uplink synchronization control method provided in Embodiment 2 of the present invention. The method can be executed by the base station, and implemented in the form of software or hardware. The code division multiple access uplink synchronization control method includes step S210-step S220:

[0040] S210. Receive the frame signal sent by the user equipment, wherein the multi-pilot signal Pilot of the i-th user equipment is distributedly inserted into the frame signal sent by the i-th user equipment i,j , j=1~K, the multi-pilot signal Pilot of the i-th user equipment i,j Obtained according to the pilot signal generation method described in any one of Embodiment 1, wherein i, j and K are positive integers;

[0041] S220. According to the multi-pilot signal Pilot of the i-th user equipment i,j Acquiring an uplink timing reference value of the i-th user equipment.

[0042] Wherein, the uplink timi...

Embodiment 3

[0053] Figure 4 It is a schematic diagram of composition of a frame signal applicable to Embodiment 3 of the present invention. In this embodiment, in a CDMA synchronous control system, the chip rate is 240Kcps (chip per-second), and the uplink frame signal duration is 10ms. The channel code adopts OVSF code, and the maximum spreading factor is 16. Each frame signal includes 2400 chips, corresponding to 150 16-fold spread spectrum symbols, and the pilot signal rate is 15k. Each frame signal inserts 16 groups of multi-pilot signals, each group occupies 32 chips, and there are 118 data signals. The structure of the specific frame signal is as follows Figure 4 shown. Wherein, the scrambling code sequence is P=[1-1-1-1-1111-111-11-1-1-1-1-1-1-1-1-111-1-1-11-1-11-1 -1]; pilot generation matrix W=[Wa 16 Wa 16 ], where Wa 16 It is a Walsh matrix with 16 rows and 16 columns. The single pilot signal Pilot of the i-th user equipment i By W i-th row vector W i Multiplied wi...

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Abstract

The invention discloses a pilot signal generating method and device and a CDMA (Code Division Multiple Access) uplink synchronization method and device. The pilot signal generating method includes according to a first matrix W=[Wa<n> Wa<n>...Wa<n>] and a scramble sequence P, obtaining a single pilot signal of an i user equipment Pilot=W convolve P; according to the single pilot signal of an i user equipment Pilot, constructing the j pilot signal of the i user equipment Pilot<ij>, K<=n, Pilot<i,j>=Pilot*C<i(j%n), i<=n, j=1-K, C<ij> is the bit in the i row and the j line, K and j are positive integers and K is the quantity of multi-pilot signals. According to the technical scheme provided by the invention, the pilot signals are inserted into frame signals of the user equipment in a distributed manner, so that accurate and quick channel estimation of a base station is realized.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of wireless communication, and in particular, to a method and device for generating a pilot signal, and a method and device for uplink synchronization with code division multiple access. Background technique [0002] Code Division Multiple Access (CDMA) is a communication technology system developed on the basis of spread spectrum communication technology, which has many advantages such as strong anti-interference ability, good confidentiality, low power spectral density, and flexible networking. , has been widely used in 2G, 3G and other wireless communication fields. The signals transmitted by multiple user terminals on the uplink of ordinary CDMA technology arrive at the receiver side asynchronously, and have lost their orthogonality, resulting in a significant decrease in system capacity and a significant increase in receiver complexity. [0003] The proposal of synchronous CDMA ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04W56/00H04L27/38
CPCH04B1/70754H04B7/2668H04B7/2678H04L27/3854H04W56/0005
Inventor 郑磊周雅新
Owner 北京九天微星通信技术有限公司