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OFDM (Orthogonal Frequency Division Multiplex) modulator-demodulator based on FFT (fast Fourier transform)

A technology of modulation, demodulation and de-interleaving, applied in the field of wireless communication, can solve the problems of not being able to solve the problems of not being able to solve the problems of not giving the overall system complexity and not being able to optimize the overall system resources, and achieving the goal of simplifying resource consumption and simplifying system resources Effect

Active Publication Date: 2014-08-20
深圳市鸿富胜科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide an FFT-based OFDM modulation and demodulation device, which solves the problem that the FFT transformation of non-power of 2 in the prior art cannot or does not provide a relatively optimized and applicable The implementation method and the complexity of the overall system due to the separate consideration of FFT transformation and interleaving make the resources of the overall system unable to be well optimized

Method used

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  • OFDM (Orthogonal Frequency Division Multiplex) modulator-demodulator based on FFT (fast Fourier transform)
  • OFDM (Orthogonal Frequency Division Multiplex) modulator-demodulator based on FFT (fast Fourier transform)
  • OFDM (Orthogonal Frequency Division Multiplex) modulator-demodulator based on FFT (fast Fourier transform)

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Embodiment Construction

[0022] The specific implementation of the FFT-based OFDM modulation and demodulation device provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] figure 1 It is a schematic structural diagram of the FFT-based OFDM modulation and demodulation device of the present invention, including a data scrambling module M11, an error correction coding module M12, a time domain and frequency domain interleaving module M13, an OFDM modulation module M14, an OFDM demodulation module M15, a time domain and frequency domain deinterleaving module M16, error correction decoding module M17, descrambling code M18 and channel module M10.

[0024] The data cells are coded and interleaved by the data scrambling module M11, the error correction coding module M12, and the time domain and frequency domain interleaving module M13 in the transmitter, and then input to the OFDM modulation module M14. The OFDM modulation module M14 furthe...

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Abstract

An FFT-based OFDM modulation and demodulation device, including a time-domain and frequency-domain interleaving module for forming OFDM symbols in a transmitter, an OFDM modulation module, and a frequency-domain processing module for receiving signals in a receiver Corresponding OFDM demodulation module, time domain and frequency domain deinterleaving module and channel module, the OFDM modulation module includes an IFFT module, the OFDM demodulation includes an FFT module, the IFFT module is implemented by the FFT module, The FFT module is used to decompose the FFT, and any base value is processed by a corresponding single module to realize the FFT transformation based on any point, and there is no need to perform sequence input and reverse sequence output, saving memory resources.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an FFT-based OFDM modulation and demodulation device. Background technique [0002] Orthogonal Frequency Division Multiplex (hereinafter referred to as OFDM) technology is a special multi-carrier modulation and demodulation technology, which has been widely used in modern communication systems. Its multi-carrier modulation and demodulation is realized through Inverse Fast Fourier Transform (Inverse Fast Fourier Transform, hereinafter referred to as IFFT) and Fast Fourier Transform (Fast Fourier Transform, hereinafter referred to as FFT). [0003] N-point FFT algorithm description: [0004] X ( k ) = Σ n = 0 N - 1 x ( n ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 徐文波高亮杨娟宋灿何海波
Owner 深圳市鸿富胜科技有限公司
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