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Spreading code capturing method and system for hybrid carrier direct sequence spread spectrum signal
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A technology of direct sequence spread spectrum and mixed carrier, which is applied in the field of spread spectrum code acquisition method and system, can solve the problems of high false alarm probability and low precision, reduce system complexity, solve low capture precision, and solve false alarm probability increased effect
Active Publication Date: 2022-02-01
HARBIN INST OF TECH
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[0004] The purpose of the present invention is to solve the problem of high false alarm probability and low accuracy when capturing the spreading code of the existing mixed carrier direct sequence spread spectrum method, and proposes a spread spectrum method for mixed carrier direct sequence spread spectrum signals. Frequency Code Acquisition Method
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specific Embodiment approach 1
[0046] Specific implementation mode 1. Combination figure 2 and image 3 This embodiment will be described. A method for acquiring a spreading code of a mixed-carrier direct-sequence spread spectrum signal described in this embodiment, the method specifically includes the following steps:
[0047] at the sending end
[0048] Step 1. Local PN sequence X of length N 0 =(x 0 ,x 1 ,x 2 ,...,x N-1 ) is transformed by α-order WFRFT to obtain the spreading sequence
[0049] where x 0 ,x 1 ,x 2 ,...,x N-1 are the local PN sequence X 0 The 1st, 2nd, 3rd, ..., Nth elements in spreading sequence The 1st, 2nd, 3rd, ..., Nth elements in
[0050] Step 2, performing signal spreading on the spreading sequence obtained in step 1 to obtain a signal after spreading; then converting the frequency of the spreading signal to an intermediate frequency and then sending it;
[0051] at the receiving end
[0052] Step 3, the receiving end multiplies the received intermediate frequ...
specific Embodiment approach 2
[0068] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is that the specific process of the step six is:
[0069]
[0070] in, yes The conjugate transpose matrix of , express The conjugate of k=0,1,...,N-1.
[0071] Other steps and parameters are the same as those in Embodiment 1.
specific Embodiment approach 3
[0072] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the with the local PN sequence X 0 =(x 0 ,x 1 ,x 2 ,...,x N-1 ) to do the correlation operation to get the correlation value The specific process is:
[0073]
[0074] Among them, (X 0 ) H is x 0 The conjugate transpose matrix of , (x k ) * means x k the conjugate.
[0075] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.
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Abstract
The invention discloses a spread code capturing method and system for a hybrid carrier direct sequence spread spectrumsignal, and belongs to the field of wireless communication. According to the invention, the problems of large false alarm probability and low acquisition precision during acquisition of the spread spectrum code in the existing hybrid carrier direct sequence spread spectrum method are solved. The method comprises the following steps: firstly, obtaining the self-correlation of a spread spectrum sequence code through WFRFT conversion, firstly, carrying out a time domain initial spread spectrum code serial synchronous acquisition process at a receiving end, and after the initial spread spectrum code acquisition is completed and the approximate synchronous position of the spread spectrum code is determined, carrying out WFRFT domain inverse conversion on the spread spectrum code and carrying out accurate synchronization. The complexity of the system is effectively reduced while the synchronization precision of the system is improved, the false alarm probability during capturing is reduced, the capturing precision is improved, and the balance between the capturing speed and the complexity of the system is realized. The method can be applied to the field of wireless communication.
Description
technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a method and system for acquiring a spread code of a mixed carrier direct sequence spread spectrumsignal. Background technique [0002] Code Division Multiple Access (CDMA) technology is a multiple access scheme. Its technical principle is based on spread spectrum technology. It uses the orthogonality between address codes to assign different address codes to different users to achieve multiple access. CDMA technology adopts the method of sequence expansion, which expands a transmission symbol into a sequence of a certain length for transmission. If the sequence is extended in the time domain, DS-CDMA is obtained, and if the sequence is extended in the frequency domain, MC-CDMA is obtained. However, the bit error rate performance of the above two methods is relatively poor under the time-frequency dual-selection channel. In order to solve this problem, the pate...
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