Generating method, communication system and communication method of circulation training sequence

一种训练序列、通信系统的技术，应用在通信系统和通信领域，能够解决训练序列干扰失真、用户上行同步失效等问题，达到减少干扰失真、高精度下行同步、避免同步失败的效果

Inactive Publication Date: 2006-11-29
DOCOMO BEIJING COMM LAB
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AI Technical Summary

Problems solved by technology

[0013] In order to solve the problem of failure of uplink synchronization of some users due to interference and distortion between training sequences sent by different users, and to achieve high-precision downlink synchronization

Method used

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  • Generating method, communication system and communication method of circulation training sequence
  • Generating method, communication system and communication method of circulation training sequence
  • Generating method, communication system and communication method of circulation training sequence

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Embodiment Construction

[0041] The present invention is mainly dedicated to solving the problem of training sequence design in the uplink / downlink synchronization process of a multi-user system. The present invention provides a set of highly efficient cyclic training sequences, which can realize accurate downlink synchronization, and can eliminate synchronization failures caused by the superposition of training sequences of multiple users during the process of realizing multi-user uplink synchronization, and reduce the number of failures due to multiple The interference distortion between different users caused by the superposition of the training sequences of each user can ensure that each user can achieve stable and reliable uplink synchronization.

[0042]

[0043] figure 1 A new cyclic training sequence S provided by the present invention is shown.

[0044] The new cyclic training sequence S includes two training symbols t1 and t2 of the same length, wherein both the first training symbol t1 a...

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Abstract

A generation method of a circular training sequence containing two training symbols includes: randomly growing a first information clock with the length of N, copying the last L data before the first information block as the circulation prefix of the first training symbol, forming the first information block to the information block of the second training symbol in the same length with the first information block in terms of the circulation mode, namely, the second information block, in which, the circulation mode is to shift the last d data of the first block to the start position and copy the last L data of the second block before the second block as the training prefix of the second training symbol, so that the two symbols form a circulation training sequence.

Description

technical field [0001] The invention relates to a round-robin training sequence group used for realizing uplink / downlink synchronization in a multi-user system, that is, a round-robin training sequence group. It also relates to a communication system and a communication method using the set of cyclic training sequences. Background technique [0002] Many existing classical algorithms are used for downlink synchronization [1]-[7]. However, in a multi-user system, uplink synchronization is usually difficult, especially when the multi-user adopts a full-multiplex transmission mode. This is because different users have different distances from the base station in uplink transmission, and thus have different time offsets. In addition, different users use different oscillators, so that the center frequencies of these oscillators may be different; at the same time, different Doppler frequency shifts are generated due to different moving speeds of different users. The above two r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04L5/24
CPCH04L27/2613H04B7/2675H04B7/2678H04L27/2657H04L27/2662
Inventor 张中山加山英俊
Owner DOCOMO BEIJING COMM LAB
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