Code programming method based on multiple time delay repeated code in code division multiple access system

A code division multiple access and code repetition technology, which is applied in network planning, multiplexing code allocation, electrical components, etc., can solve problems such as inappropriateness, and achieve the effect of avoiding interference, improving allocation quality, and improving planning quality.

Inactive Publication Date: 2012-10-10
XIAMEN UNIV +1
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Problems solved by technology

[0014] However, from the perspective of communication and the processing of spread spectrum scrambling in 3GPP, once there is a delay, it is not appropriate to use the zero padding method when calculating the correlation between codes

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  • Code programming method based on multiple time delay repeated code in code division multiple access system
  • Code programming method based on multiple time delay repeated code in code division multiple access system
  • Code programming method based on multiple time delay repeated code in code division multiple access system

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Embodiment Construction

[0041] The mapping diagram for mapping the relative distance between stations to the relative time delay described in the present invention, such as figure 1 shown. Let the point of station 1 be O 1 , the point where station 2 is located is O 2 . Connect to 1 and O 2 , and the intersection points of the signal radiation circle are A and B respectively, where O 1 A=S 11 , O 1 B=S 12 , O 2 B=S 21 , O 2 A=S 22 . Suppose S 11 ≤S 21 , it is easy to prove that every point in the overlapping region to O 1 and O 2 The relative distances are all within the interval bounded by two points A and B. and when [S 11 , S 12 ] and [S 21 , S 22 ] intersection is an empty set, the relative distance range is [S 21 -S 12 , S 22 -S 11 ]; when [S 11 , S 12 ] and [S 21 , S 22 ] intersection is a non-empty set, the relative distance range is [0, S 22 -S 11 ]. The transmission speed of the signal is c, then the corresponding delay range can be obtained [(S 21 -S 12 ) / c...

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Abstract

The invention discloses a code programming method based on multiple time delay repeated codes in a code division multiple access system, which relates to a code division multiple access (CDMA) mobile communication technology. The method of the invention comprises the following steps: carrying out relevance analysis on relative time delay codes; based on the relevance analysis of the time delay codes, carrying out repeated code judgment on the CDMA system; and by the code programming method based on the multiple time delay repeated codes, selecting a scrambling code group used for an adjacent cell, and distributing code words with good performance. The invention has the advantages of providing the code programming method based on the multiple time delay repeated codes, carrying out relevance analysis on the multiple time delay codes mainly based on a relative distance, obtaining the grouping condition of the scrambling codes in the relative distance range under different time delays, then carrying out code programming on the basis, and avoiding interference generated due to time delay, thereby improving the distribution quality. Thus, the provided method can improve the programmingquality of the network, thereby improving the overall operating performance of the system.

Description

technical field [0001] The invention relates to code division multiple access (CDMA) mobile communication technology, in particular to a code planning method based on scrambling code allocation in a time division-synchronous code division multiple access (TD-SCDMA) mobile communication system. Background technique [0002] Since the basic feature of Code Division Multiple Access (CDMA) mobile communication system is to use different codewords to distinguish users and channel information in different cells, scrambling code planning and optimization is an indispensable part of CDMA system network planning and optimization. However, in TD-SCDMA, the length of the scrambling code is relatively short, and there may be repeated codes in the compound code formed after spreading and scrambling. Therefore, the code words of the TD-SCDMA system are planned and optimized in the form of scrambling code groups. Code planning must also be considered simultaneously with downlink synchroniz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W16/02H04J13/16
Inventor 黄联芬袁雁南高志斌姚彦张远见
Owner XIAMEN UNIV
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