Method and system for reducing peak-to-average ratio of transmitting signal of OFDM system
A technology of transmitting signal and peak-to-average ratio, which is applied in the field of communication, can solve the problems of reducing the peak-to-average ratio of OFDM system transmission signal, affecting the performance of OFDM system, signal amplitude and phase distortion, etc., to achieve simplified equipment structure, simplified algorithm, and reduced code Interference effect
Inactive Publication Date: 2016-02-03
XIAN UNIV OF POSTS & TELECOMM
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[0003] The purpose of the present invention is to provide a method and system for reducing the peak-to-average ratio of OFDM system transmission signals, aiming to solve the problem of easy distortion of signals in existing wireless communication systems, resulting in sub-channel interference, signal amplitude and phase distortion , thus affecting the performance of the OFDM system
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[0068] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0069] The application principle of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0070] figure 1 Shows the structural diagram of the algorithm for reducing the peak-to-average ratio of the OFDM system transmitter of the present invention, as figure 1 As shown, the system includes: FPGA module 1 , digital-to-analog converter 2 and voltage module 3 . The FPGA module 1 includes program modules such as a serial-to-parallel conversion unit, a precoding unit, an inverse fast Fourier transform (IFFT) unit, a signal amplitude estimation unit, and a...
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The invention discloses a method and a system for reducing a peak-to-average ratio of a transmitting signal of an OFDM system. The system comprises an FPGA module; a digital to analog converter, which is connected with the FPGA module and is used for achieving digital to analog conversion and processing a signal with a high front-end data rate; and a power module, which is connected with the FPGA module and the digital to analog converter and is used for providing a direct current working voltage. A fast Fourier transformation unit of the system disclosed by the invention achieves multi-carrier mapping; a butterfly computing unit adopts 4 pairs of RAM*2 to store operands of butterfly computing to greatly improve the computing speed; a twiddle factor unit adopts a look-up table method to accelerate the algorithm execution speed; a ping-pang cache structure is configured to a ping-pang structure to improve the computing speed; and a pre-encoding unit adopts the Zadoff-Chu sequences algorithm, which is conducive to reduce intersymbol interference (ISI), and meanwhile, a Zadoff-Chu sequence has symmetry, so that the sequence generation complexity can be reduced.
Description
technical field [0001] The invention belongs to the technical field of communication, and specifically relates to a method and a system for reducing the peak-to-average ratio of transmitted signals of an OFDM system. Background technique [0002] The transmitter of the wireless base station in the wireless communication system uses the power amplifier to transmit the signal, the purpose is to compensate the signal attenuation caused by the long propagation distance. The power amplifier has a certain linear region, and the cost of the power amplifier depends on the size of its linear region. A signal with a peak-to-average ratio will reduce the efficiency of the power amplifier and increase power loss, which puts high demands on the linearity of the power amplifier. In order to ensure that the power amplifier works in the linear region and improve its efficiency, it is required that the peak-to-average ratio of the signal entering the power amplifier must be within a certain...
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Login to View More IPC IPC(8): H04L27/26
CPCH04L27/2615H04L27/2614
Inventor 李波王明王培韩磊王萌淮
Owner XIAN UNIV OF POSTS & TELECOMM