A D2D communication spectrum sharing method and device based on rank sum test
A spectrum sharing and spectrum technology, which is applied in the field of D2D communication, can solve the problems of energy detection method performance degradation, poor spectrum detection performance, and low correlation, so as to overcome the defect of repeated calculation threshold, improve detection robustness, and reduce calculation volume effect
Active Publication Date: 2019-02-26
XIAN UNIV OF POSTS & TELECOMM
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Problems solved by technology
The energy detection method needs to know the noise power, when the noise power is not known, the performance of the energy detection method will be severely degraded
The covariance detection method can use the correlation between the received signals of different D2D users to realize spectrum detection, but in practical applications, the correlation between the received signals is low or even irrelevant, and the spectrum detection performance is poor at this time
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[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0041] In order to make the present invention more intuitive, combined with the attached figure 2 , attached image 3 and the embodiment for further description, the specific implementation steps of the D2D communication spectrum sharing method based on the rank sum test in this embodiment are expressed as follows:
[0042] 1: The received signal is sampled by the sampler, and the sampler samples the received signal x(t) to obtain the sampling point value x m (n) (m=1,2,...,M; n=1,2,...,N), m is the D2D user serial number, and n is the sampling time;
[0043] 2: The value counter collects all the sampling point values and calculates the instantaneous power vector of the received signal
[0044] P=[p 1 (1)p 1 (2) …p 1 (N) … p M (1)p M (2) …p M (N)];
[0045] Calculate the received signal instantaneous power vector vector P:
[0046] ...
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The invention discloses a D2D communication spectrum sharing method and device based on a rank sum test. The device comprises a sampler, a numerical value calculator and a decision device, wherein the sampler is used for sampling signals and transmitting numerical values of sampling points to the numerical value calculator, the numerical value calculator calculates test statistic according to the signals of the sampling points and transmits a result to the decision device, and the decision device compares the received test statistic with a threshold to determine whether a spectrum is occupied. When the test statistic and the theoretical decision threshold are calculated, the prior information of a main user and the noise does not need to be foreknown, thereby realizing blind detection of the spectrum. Compared with the traditional method, the device disclosed by the invention can work in an environment with low signal correlation, and the result is not affected by the uncertainty of the noise. In addition, according to the device disclosed by the invention, when the number of the sampling points changes, the requirements of a constant false alarm probability can be satisfied without recalculating the decision threshold, thereby overcoming the defect that the existing algorithm needs to repeatedly calculate the threshold, and reducing the computational burden.
Description
technical field [0001] The present invention relates to the field of D2D communication, in particular to a D2D communication spectrum sharing method and device based on a rank sum test. Background technique [0002] Due to the rapid growth of multimedia service demands, the shortage of spectrum resources has become a challenge for mobile communications. In traditional cellular networks, direct communication between users is not allowed. The communication process is divided into two stages by the transfer of the base station: from the transmitter to the base station, that is, the uplink; from the base station to the receiver, that is, the downlink. This centralized working mode facilitates the management and control of resources and interference, but the efficiency of resource utilization is low. In order to improve spectrum utilization efficiency, Qualcomm first proposed D2D communication technology in 2008. D2D communication is a new technology that allows end users to c...
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IPC IPC(8): H04B17/382
CPCH04B17/382
Inventor 刘雁飞徐偲卢光跃弥寅苏杭
Owner XIAN UNIV OF POSTS & TELECOMM