Soft spreading code optical selection method of mixed spread spectrum multiple-access network

A hybrid spread spectrum and soft spread spectrum technology, applied in the field of selection and application of soft spread spectrum codes, can solve the problems of inability to ensure signal orthogonality, small number, low codeword efficiency, etc. The effect of resisting inter-network interference and saving computation

CN108242941AActive Publication Date: 2018-07-03NO 20 RES INST OF CHINA ELECTRONICS TECH GRP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-07-03

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Abstract

The invention provides a soft spreading code optical selection method of a mixed spread spectrum multiple-access network; the method comprises the following steps: setting limit conditions according to structure characteristics of a cyclic shift keying (CCSK) code, and forming a code database satisfying proportionality and autocorrelation requirements; employing an origin traversal-initial random-end segment directed segmented search method to screen a set of soft spreading codes satisfying cross correlation requirements from the autocorrelation code database; finally combining with a frequency hopping pattern so as to reasonably distribute the soft spreading codes to each network for usage. The method can effectively reduce the internetwork interferences, thus improving the system networking ability.
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Description

technical field

[0001] The invention relates to the field of hybrid spread spectrum time division multiple access communication system, in particular to the optimization and application method of the soft spread spectrum code. Background technique

[0002] In the hybrid spread spectrum TDMA communication system, each user of the same network uses TDMA to share the channel, and uses frequency hopping and soft spread spectrum technology in each time slot to make the system have multi-network capability, that is, different network users The transmitted signals are kept orthogonal in the frequency or code domain. Specifically, when the frequency hopping frequency points of signals transmitted by different network users collide randomly, that is, when the signals collide in the frequency domain, using soft spreading codes for spreading can ensure that the signals are orthogonal in the code domain. For example, in the LINK16 data link of the US military, a 32-bit cyclic shift key...

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0020] The present invention is applicable to the time division multiple access hybrid spread spectrum system using frequency hopping and soft spread spectrum technology, and provides an optimal screening method of soft spread spectrum cyclic codes and a method for multi-network allocation and use, which can be used according to the required codeword The length is selected from the code library to meet the performance requirements of autocorrelation and cross-correlation. A set of soft spreading codes is combined with the frequency hopping pattern to reasonably allocate soft spreading codes in each network, which reduces the user's inter-network interference. It provides a strong support to ensure the multi-network working ability of the system.

[0021] The present inventi...