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A Phase Noise Suppression Method Based on Continuous Carrier Aggregation

A phase noise, continuous carrier technology, applied in baseband systems, baseband system components, shaping networks in transmitters/receivers, etc., to achieve the effect of suppressing CPE and ICI, and suppressing phase noise

Inactive Publication Date: 2020-12-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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Problems solved by technology

[0007] The purpose of the present invention is to design a time-domain filtering method for channel estimation by combining channel estimation and CPE correction based on the existing continuous carrier aggregation technology based on the shortcomings and deficiencies of phase noise suppression, and using the sparse characteristics of CIR. A method that can use the sparsity property of CIR to suppress phase noise without having prior information about CIR

Method used

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  • A Phase Noise Suppression Method Based on Continuous Carrier Aggregation
  • A Phase Noise Suppression Method Based on Continuous Carrier Aggregation
  • A Phase Noise Suppression Method Based on Continuous Carrier Aggregation

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Embodiment

[0049] In the continuous carrier aggregation system, N=1024 subcarriers are transmitted, and the transmitted frequency domain signal is obtained by performing 16-orthogonal amplitude modulation on it:

[0050] X=[X(0) X(1) ... X(1023)] T

[0051] The phase noise φ(n) on the nth subcarrier is modeled using the Power Spectral Density (PDS) estimation method:

[0052]

[0053] It can be obtained by measuring a real tuner with a phase-locked loop (PLL), setting the model parameters as a=6.5, b=4, f 1 = 1KHz and f 2 =10KHz, the sampling frequency of the system is 40MHz, and the Gaussian noise sequence is used to generate a phase noise signal through a low-pass filter:

[0054] φ=[φ(0) φ(1) … φ(1023)] T .

[0055] The cyclic prefix length N g Set to 32, assuming that the transmitted signal propagates through a multipath fading channel, the number of multipath channels is M=4, and the time domain channel is modeled by pulse delay:

[0056]

[0057] where α m is the attenu...

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Abstract

The present invention belongs to the technical field of wireless communication, and relates to phase noise inhibition method based on continuous carrier aggregation. The present invention designs a method for inhibiting phase noise through adoption of channel sparse features. The method comprises the steps of: performing frequency domain conversion of receiving signals, extracting pilot frequencyreceiving signals from the receiving signals, initially estimating channel impulse response, employing the sparse features of the channel impulse response (CIR) to design a time-domain filter to further estimate the channel impulse response, and obtaining the channel frequency domain response through FFT operation to estimate transmission data. The channel impulse response obtained through combination of the channel estimation and the CPE solves the problems that the CPE cannot be separated from the CIR, and performs simultaneous inhibition of the two distortions of the CPE and the ICI causedby phase noise in a condition without channel prior information so as to make up the deficiency of a traditional method at the aspect of inhibition of the CPE and the ICI.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and can be used for suppressing phase noise based on continuous carrier aggregation in a wireless communication system. Background technique [0002] With the increasing development of wireless communication technology, the number of mobile communication users continues to increase, the user's demand for mobile traffic continues to increase, and the requirements for data rates are also getting higher and higher. Based on the pursuit of high network speed, carrier aggregation has become an inevitable choice for operators facing the future. Carrier aggregation refers to the aggregation of multiple LTE carrier units to form a spectrum with a larger bandwidth, thereby increasing the data transmission rate. Continuous carrier aggregation is to integrate several adjacent smaller carriers into one larger carrier to increase the transmission bandwidth. [0003] A major disadvantage of ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03
CPCH04L25/0212H04L25/022H04L25/0224H04L25/03012H04L25/03159H04L25/03821
Inventor 黄际彦张彤彤王亚龙母国才王斌王成李广新
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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