Direct sequence spread spectrum signal acquiring and recovering method based on compressed sensing
A direct-sequence spread spectrum and compressed sensing technology, applied in baseband system components, shaping networks in transmitters/receivers, electrical components, etc. problems, to achieve the effect of reducing the amount of data collection, reducing requirements, and reducing costs
Inactive Publication Date: 2015-05-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
In the direct sequence spread spectrum communication system, since the signal bandwidth is further broadened during the spread spectrum process, it becomes very difficult for the receiver to sample according to the Nyquist sampling law, which will increase the sampling cost and sampling complexity
In addition, after spreading, even if the system can sample at the Nyquist rate, the amount of data collected will be quite large, which will consume subsequent digital processing resources and time
The traditional direct-sequence spread spectrum communication system still samples at the Nyquist rate. However, as the signal frequency increases, the sampling rate of the A / D part of the system begins to approach the physical limit, which will increase the design difficulty and increase the cost.
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[0030] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0031] The direct sequence spread spectrum signal (direct spread signal) uses multiple chips to represent the information of one symbol, so there is a way to make it unnecessary to sample the chips at the Nyquist rate, which is the theory of compressed sensing The application to the reception of direct spread signals provides a theoretical basis.
[0032] For the receiver, the number of resolvable multipaths is far less than the total number of multipaths that may actually appear, and the energy of the signal is often concentrated in a small number of resolvable multipaths. From the perspective of the ratio of the number of multipaths, it can reflect the sparsity. Therefore, it can be considered to search for the spread frequency domain for the direct spread signal, and perform sparse representation on the direct spread signal, so as to use a lower rate f...
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The invention discloses a direct sequence spread spectrum signal acquiring and recovering method based on compressed sensing. According to the method, the requirements on A / D (analog / digital) sampling rate can be reduced, so that the purpose of reducing the data acquiring amount can be fulfilled. The method comprises the steps of determining a spread spectrum base of a direct sequence spread spectrum signal and adopting a Gaussian random matrix or a Radeacher matrix as a measurement matrix; under an imnoise condition, filtering analog signals received by a receiver by using M filters, sampling the filtered signals at the sampling rate far lower than a Nyquist so as to obtain a vector quantity, and carrying out multiplication on a spread spectrum domain and a result obtained after recovering according to a sample result, the spread spectrum domain and the measurement matrix and by suing a recovering method based on the compressed sensing, so as to obtain an estimated value of the direct sequence spread spectrum signal.
Description
technical field [0001] The invention relates to compressed sensing technology and belongs to the field of communication signal processing, in particular to a method for collecting and restoring direct sequence spread spectrum signals based on compressed sensing. Background technique [0002] According to the Nyquist sampling law, in order to receive the signal without distortion, the receiver needs to sample at a rate no lower than twice the highest frequency component of the signal. With the development of today's wireless communication systems, the bandwidth of the signal is getting wider and wider, which puts forward very high requirements on the front-end A / D of the receiver. In the direct sequence spread spectrum communication system, since the signal bandwidth is further broadened during the spread spectrum process, it becomes very difficult for the receiver to sample according to the Nyquist sampling law, which will increase the sampling cost and sampling complexity. ...
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IPC IPC(8): H04L25/03H04B1/7075H04B1/709
Inventor 安建平王帅王铁星卜祥元周荣花刘珩杨杰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY