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A dynamic multi-user detection method and a dynamic multi-user detection device thereof
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A multi-user detection and dynamic technology, applied in multi-frequency code systems, digital transmission systems, electrical components, etc., can solve the problem of not knowing which users are, and achieve the effect of easy operation and easy call.
Active Publication Date: 2022-03-18
ANHUI UNIVERSITY
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[0003] In order to solve the technical problem that existing users can send data randomly, but the BS does not know which users are active, the present invention provides an easy-to-run, easy-to-call, and interruptible dynamic multi-user detection method and its dynamic multi-user detection device
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Embodiment 1
[0043] see figure 1, which is a flowchart of the dynamic multi-user detection method of the present invention. The dynamic multi-user detection method of the present invention can reduce transmission time delay and signaling overhead, and can realize signaling-free transmission in the uplink NOMA system, wherein users can send data randomly, and BS (i.e. base station) through data processing It can be defined which users are active, so it can be conveniently processed in the follow-up process. At the same time, because BS is constantly updating active users, the data maintains real-time reliability.
[0044] The dynamic multi-user detection method includes the following steps.
[0045] Step 1, obtain the sending signals of K users: x=[x 1 ,x 2 ,...,x K ] T , x k is the sending symbol of user k.
[0046] Step 2, design the spreading sequence s k :s k =[s 1,k ,s 2,k ,...,s N,k ] T ,s N,k Send symbol x for user k k is modulated onto a spreading sequence of length N...
Embodiment 2
[0060] see figure 2 , which is a schematic diagram of functional modules of the dynamic multi-user detection device of the present invention. The dynamic multi-user detection device includes a transmission signal acquisition module, a spread spectrum sequence design module, a Gaussian noise vector design module, a modulation signal design module, a preprocessing module, an amplification module, a demodulation module, a statistical module, a definition module, and a data module.
[0061] The transmission signal acquisition module, the spread spectrum sequence design module, the Gaussian noise vector design module, and the modulated signal design module are all set in the user end. The preprocessing module, the amplification module, the demodulation module, the statistics module, the definition module, and the data module are all set in the base station.
[0062] The sending signal acquisition module acquires the sending signals of K users: x=[x 1 ,x 2 ,...,x K ] T , x k ...
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Abstract
The invention discloses a dynamic multi-user detection method and a dynamic multi-user detection device thereof. By designing a specific modulation signal Y, the present invention only needs to perform zero-amplitude processing on the modulation signal Y to the data whose amplitude is within a predetermined threshold range in the modulation signal Y, and then amplify the data beyond the predetermined threshold range , the modulated signal Y processed in this way is demodulated, and the number of received symbols sent by the same user within a predetermined period of time is counted. As long as the number of times is greater than a predetermined number threshold, active users can be distinguished. Therefore, it is easy to run, easy to call, and can be interrupted at any time, and can get real active users with a high probability. Users can send data randomly, and the base station can define which users are active through data processing, which can facilitate management in the follow-up process. At the same time, because the base station is constantly updating active users, the data maintains real-time reliability.
Description
technical field [0001] The invention relates to a dynamic multi-user detection method and a dynamic multi-user detection device thereof, in particular to a dynamic multi-user detection method and a dynamic multi-user detection device in an uplink signaling-free NOMA scenario. Background technique [0002] Multiple access technology has been regarded as the key technology of each generation of wireless communication system. In particular, Orthogonal Multiple Access (OMA), ie, Orthogonal Frequency Division Multiple Access (OFDMA), is used in the current 4G system. In OMA, the number of supportable users is strictly limited by the number of available orthogonal resources, which makes it difficult to meet the demand for large-scale connections in future 5G systems. To address this challenge, non-orthogonal multiple access (NOMA) has been actively studied, which can achieve system overload through non-orthogonal resource allocation. The uplink transmission is scheduled by the b...
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