A low-latency carrier aggregation method and device for 5g mobile fronthaul
A carrier aggregation and low-latency technology, which is applied to the separation device of the transmission path, the modulation carrier system, the transmission system, etc., to achieve the effect of reducing information processing delay, reducing signal transmission damage, and reducing signal processing delay.
Active Publication Date: 2020-11-17
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0004] Aiming at the defects of the prior art, the purpose of the present invention is to solve the technical problem of time delay caused by carrier aggregation signal PAPR in 5G-oriented mobile fronthaul
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[0049] The present invention also provides a method for implementing low-latency carrier aggregation oriented to 5G mobile fronthaul. For details, refer to figure 2 , including the following steps:
[0050] On the transmitter unit, after the input N LTE signals are processed by the baseband signal, carrier aggregation based on code division multiplexing is performed to obtain one PAPR enhanced aggregation signal, and the PAPR of the aggregation signal is suppressed in a small number of iterations through code domain reservation. , the digital-to-analog conversion is completed through the digital-to-analog converter, and the aggregated electrical signal is amplified to a sufficient amplitude through the microwave amplifier to directly drive the directly modulated laser, and the electrical signal is converted into an optical signal through the directly modulated laser, and the aggregated signal is modulated on the optical carrier , through the adjustable optical attenuator, adj...
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The invention discloses a 5G mobile forward transmission oriented low-delay carrier aggregation method, which comprises the following steps of: performing carrier aggregation on a received carrier signal based on code division multiplexing to obtain an aggregated signal; performing amplitude limiting processing on the aggregated signal according to a preset clipping threshold to obtain a clippingnoise signal; distributing the clipping noise signal into a reserved code word, and obtaining a noise elimination signal through orthogonal decomposition; taking the position with the amplitude exceeding the clipping threshold in the noise elimination signal as a peak elimination position, and solving an optimization factor enabling the amplitude square difference between the noise elimination signal and the clipping noise signal to be minimum at the peak elimination position by using a minimum mean square algorithm; and performing accelerated convergence on the noise elimination signal basedon the optimization factor to obtain an aggregated signal for inhibiting the PAPR. According to the invention, the PAPR of the code division multiplexing carrier aggregation signal can be effectivelysuppressed, the information processing time delay of the forward transmission system is reduced, and the new requirements of a 5G wireless forward transmission network architecture on high speed, large capacity and low time delay are met.
Description
technical field [0001] The present invention relates to the technical field of optical fiber and wireless converged access, and more specifically, to a low-latency carrier aggregation method and device for 5G mobile fronthaul. Background technique [0002] With the rapid growth of mobile communication device users, in order to meet users' ever-increasing wireless access needs, the 4G Centralized Ratio Access Network (C-RAN) architecture has changed, and the two-level structure is shifting to 5G wireless access. The three-level structure of the network changes, and the interface rate and type of the base station change significantly. Under the new 5G architecture system, the traditional baseband processing unit (Building Baseband Unit, BBU) is divided into two logical network components, the Centralized Unit (CU) and the Distributed Unit (DU). Under this architecture, wireless The access network architecture puts forward more stringent requirements on the fronthaul delay. ...
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IPC IPC(8): H04L5/00H04L27/26
CPCH04L5/001H04L27/2602H04L27/2614
Inventor 涂昱成付松年唐明刘德明
Owner HUAZHONG UNIV OF SCI & TECH