A Direct Spread Signal Transmission Method Based on Direct Differential Coherent Accumulation
A technology of coherent accumulation and direct spread signal, which is applied in the field of coarse capture, and can solve problems such as data bit jumps
Active Publication Date: 2021-03-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0003] Aiming at the problem of data bit hopping after the despreading of the direct spread signal under large frequency deviation, the present invention proposes a transmission method of direct spread signal based on direct differential coherent accumulation, which is used to complete the synchronous coarse capture
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[0019] The technical scheme of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. However, it should not be understood that the scope of the above-mentioned subject of the present invention is limited to the following examples, and all technologies realized based on the content of the present invention belong to the scope of the present invention.
[0020] figure 1 Shown is a flow chart of initialization of necessary parameters of the sending end in a specific embodiment of the present invention.
[0021] Include the following steps:
[0022] Step 1. Set two sampling points within one spreading chip period, that is, the sampling rate is twice the data rate, which is exactly equal to the Nyquist rate.
[0023] Step 2. Select an m-sequence with a length of 1024 as the PNCode.
[0024] Step 3. Copy the PNCode into two identical PN sequences to form the coarse sync header spreading sequence s[n]. At this time, ...
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The invention discloses a direct-spread signal transmission method based on direct differential coherent accumulation, and belongs to the technical field of reception and processing of spread-spectrum signals. The direct spread signal acquisition method of performing conjugate multiplication and coherent integration on the descrambled signal, in which the conjugate multiplication operation is called differential coherence; where the received signal should be two identical PN segments after descrambling Sequence, that is, the sent pseudo-random sequence should be two identical PN sequences before scrambling. The core of the present invention lies in the special design of the coarse synchronization head of the signal. The receiving end eliminates the influence of the frequency offset by performing conjugate multiplication (differential coherence) on the coarse synchronization head of the received signal, so that it is no longer affected by the coherent integration. The impact of data bit jumps caused by Doppler frequency offset. Since the required sequence length is only related to the SNR, the algorithm can search for DS signals in a very large frequency range with a certain sequence length under a certain SNR.
Description
technical field [0001] The invention belongs to the technical field of reception and processing of spread spectrum signals, and relates to a rough acquisition method capable of completing the synchronization of direct sequence spread spectrum signals under relatively large Doppler frequency deviation. Specifically, it is a direct spread signal synchronization method based on differential conjugate multiplication and coherent integration. Background technique [0002] Direct sequence spread spectrum technology (referred to as "direct spread") is one of the core areas of digital communication. Direct sequence spread spectrum technology was originally used in military communication networks as a means of resisting interference and intercepting threats. The rapid development of civilian communication systems and networks, such as mobile communication systems, cognitive radio, sensor networks and the Internet of Things, has been widely used in commercial systems and has become a ...
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IPC IPC(8): H04B1/7073
CPCH04B1/7073H04J13/0022
Inventor 陈延涛董彬虹赵宇轩李芊饶崔亚笛
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA