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All phase OFDM system design based on FPGA

A system design, all-phase technology, applied in multi-frequency code systems and other directions, can solve problems such as signal phase offset, carrier signal noise, and reduce noise power, and achieve the effect of solving frequency offset and phase noise problems.

Inactive Publication Date: 2013-10-02
YUNNAN UNIV
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Problems solved by technology

[0005] In order to solve the problem that the signal is prone to phase shift and cause carrier signal noise under the time-varying excitation environment, the FFT using the all-phase signal preprocessing technology has the characteristics of "phase invariance", and the windowless all-phase preprocessing method is selected to realize The all-phase processing module of this system, on the basis of the realized OFDM system, introduces the all-phase FFT processor based on FPGA into the OFDM baseband transmission system. The research shows that the OFDM system using this technology can effectively solve the phase error. Significantly reduces noise power

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  • All phase OFDM system design based on FPGA
  • All phase OFDM system design based on FPGA
  • All phase OFDM system design based on FPGA

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Embodiment Construction

[0027] like figure 1 , as shown in 2, the OFDM baseband transmission system of the present invention is divided into two parts, the sending end and the receiving end. The quadrature modulation in the system can use the fast algorithm FFT / IFFT of DFT / IDFT, and with the development of VLSI, there is no performance bottleneck in the implementation of FFT processor, which is already a very mature application. The IFFT at the sending end is responsible for converting the input signal from the frequency domain to the time domain, while the FFT at the receiving end is responsible for decomposing the signal into the frequency domain. In the middle there are processes such as QAM modulation, parallel-to-serial conversion / serial-to-parallel conversion, cyclic prefix, and guard interval.

[0028] according to image 3 , Figure 4 , Figure 5 , Figure 6Describe the function and principle process, use VHDL hardware description language programming and Modelsim professional simulatio...

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Abstract

An OFDM (Orthogonal Frequency Division Multiplexing) is a key technology in the field of wireless communication, and a phase deviation is generated easily to cause restoration distortion of a carrier signal in a time-varying excitation environment, but FFT (Fast Fourier Transform) adopting an all phase signal preprocessing technology has phase invariability, and a research shows that an OFDM system utilizing the technology can reduce a phase error effectively, and can reduce the noise power significantly. According to the system, an all phase FFT processing unit for signal processing in the OFDM system can be achieved by adopting an FPGA (Field Programmable Gate Array) technology; an all phase processing module of the system is achieved by selecting a windowless all phase preprocessing method; an all phase OFDM baseband transmission system is achieved; the processing efficiency and the expense of an APOFDM (All Phase Orthogonal Frequency Division Multiplexing) system are simulated very well on hardware due to the parallelism and the dynamic reconstruction performance of an FPGA; the system has significant performance advantages, and is low in power consumption, high in integration level and good in stability; and therefore, the system has a better theoretical value and practical significance in further improvement of the OFDM system.

Description

technical field [0001] The present invention relates to a FPGA-based all-phase OFDM system design. OFDM is a multi-carrier transmission technology, which has the characteristics of high spectrum utilization efficiency, strong anti-symbol interference capability, and flexible modulation of carrier data rate, etc., and can be widely used. In signal processing, wireless communication, wireless transmission and other fields. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a special form of multi-carrier modulation technology, also known as Discrete Multi-Tone Modulation (DMT) in Asymmetric Digital Subscriber Line (ADSL). It uses inverse fast Fourier transform (IFFT) and fast Fourier transform (FFT) to realize modulation and demodulation respectively, which is a multi-carrier modulation scheme with the lowest complexity and the widest application. Orthogonal frequency division multiplexing system adopts DFT transformation to realize the orthogo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 杨军于艳艳其他发明人请求不公开姓名
Owner YUNNAN UNIV
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