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A V-Band PAM-8 Wireless Transmission System Based on Direct Envelope Detection

A PAM-8, wireless transmission technology, applied in the field of wireless transmission, can solve the problems of complex operation and increase the amount of calculation at the receiving end, and achieve the effect of eliminating nonlinear distortion, improving bit error performance, and reducing the complexity of the receiving end

Active Publication Date: 2020-09-29
FUDAN UNIV
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  • Abstract
  • Description
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Problems solved by technology

In addition, the Hammerstein algorithm proposed by [Fernando X N, Sesay A B. AHammerstein-type equalizer for concatenated fiber-wireless uplink[J]. IEEETransactions on Vehicular Technology, 2006, 54(6):1980-1991.] and the above The mentioned DD-LMS and LMS algorithms are both digital signal processing on the received signal at the receiving end, which greatly increases the amount of calculation at the receiving end and complicates the operation

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  • A V-Band PAM-8 Wireless Transmission System Based on Direct Envelope Detection

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, the present invention is described in detail.

[0031] figure 1 Shown is the V-band PAM-8 wireless transmission system architecture based on direct envelope detection, which includes:

[0032]In the transmitting end, a continuous wave light wave with frequency fc1 from a free single-mode laser 2 is modulated by a single-drive Mach-Zehnder modulator 3 . The baseband PAM-8 signal pre-distorted by Look-up Table technology is amplified by the electric amplifier 4 and then used to drive the Mach-Zehnder modulator 3. After the modulated light wave fc1 is amplified by the polarization-maintaining erbium-doped fiber amplifier 5, it is combined with another The continuous light wave fc2 output by the free single-mode laser 1 is coupled into the polarization control coupler 6 together, and then further beat frequency converted into a V-band PAM-8 millimeter wave signal through the photodiode 7 . The PAM-8 millimeter wave signal i...

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Abstract

The invention belongs to the technical field of wireless transmission, and in particular relates to a V-band PAM-8 wireless transmission system based on direct envelope detection. The wireless transmission system provided by the invention can generate V-band PAM-8 millimeter wave signals with relatively high frequency, and wirelessly transmit for 9m. The system firstly utilizes a heterodyne technique to perform beat frequency on two laser beams in a photoelectric detector to convert into V-band PAM-8 millimeter wave signals, wherein a lookup table technology of a sending end is mainly used forperforming predistortion treatment on the PAM-8 signals, non-linear distortion in an optical wireless transmission system is eliminated, the wirelessly transmitted PAM-8 millimeter wave signals is directly detected by using an envelop detector, the received signals are balanced by using a CMMA technology, and bit error rate performance is further improved. The system provided by the invention hasthe advantages of simple structure, and low complexity of receiving end, and can be applied to high-speed millimeter wave wireless communication.

Description

technical field [0001] The invention belongs to the technical field of wireless transmission, and in particular relates to a V-band PAM-8 wireless transmission system. Background technique [0002] In order to meet the high-speed and stable development needs of future wireless communications, such as 1~10Gb / s, higher bandwidth is required. It will become very necessary to generate millimeter waves in high-frequency bands such as V-band in the future. The loss is small, and short-distance millimeter-wave wireless communication transmission can be realized. At the same time, using high-order modulation formats to transmit modulation information to improve spectrum utilization can further increase transmission rates, such as multi-order QAM signals (such as QPSK, 8QAM, 16QAM) and multi-order PAM signals (such as PAM-4, PAM8) . However, because QAM signals have two channels of information, I and Q, while PAM signals only have I and one information, the bandwidth of PAM signals...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/49H04B10/40H04B10/524H04B10/25
Inventor 周雯余建军
Owner FUDAN UNIV