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Constant envelope orthogonal frequency division multiplexing modulation method

A technology of orthogonal frequency division and modulation method, which is applied in the field of wireless communication, can solve problems such as reducing system complexity, and achieve the effect of solving system complexity, efficient processing and operation, and beneficial to balance

Active Publication Date: 2013-09-11
10TH RES INST OF CETC
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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of CE-OFDM modulation and demodulation method based on sine / cosine mapping, on the basis of realizing constant signal envelope, keep OFDM system adopts discrete Fourier transform pair to realize the efficient realization of signal modulation and demodulation, To solve the demand for reducing system complexity in broadband communications

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  • Constant envelope orthogonal frequency division multiplexing modulation method
  • Constant envelope orthogonal frequency division multiplexing modulation method
  • Constant envelope orthogonal frequency division multiplexing modulation method

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Embodiment Construction

[0021] refer to figure 1 . In the CE-OFDM transmission process based on sine / cosine mapping, the signal modulation structure is composed of PSK signal mapping module (1), IDFT processing module (2), packet limiting module (3), sine or cosine signal mapping in series module (4), cyclic prefix superposition module (5), D / A conversion module (6) and carrier modulation module (7). Among them, the PSK signal mapping module is used to convert the serial input binary data into a phase-modulated complex signal and then input it to the IDFT processing module; the IDFT processing module accumulates a certain length of input data, such as N, using discrete Fourier inverse Transform and process the N data at the same time, and output to the grouping and limiting module; the grouping and limiting module extracts the real and imaginary parts of the input N complex data to form 2N length data, and performs limiting mapping, and outputs to sine or cosine Signal mapping module; the sine or ...

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Abstract

The invention provides a constant envelope orthogonal frequency division multiplexing modulation method which is based on sine / cosine mapping and which is applied in the field of broadband wireless communication. During signal modulation, the method includes performing inverse discrete Fourier transform (IDFT) for a group of complex signals; arraying transformed data to be two groups of sequences of real numbers and performing linear amplitude-limited mapping; after being subjected to linear amplitude limiting, mapping sequences of the real numbers into sine or cosine values of unit circle signals, and allowing a signal receiving end to recover to send messages through linear calculation of two groups of discrete Fourier transform (DFT). During signal demodulation, the method includes performing two groups of discrete Fourier transform, combining two groups of data processed through discrete Fourier transform, and obtaining complex signals for bit demodulation. According to the constant envelope orthogonal frequency division multiplexing modulation method, transmitting power of an amplifier can be utilized completely against frequency selective fading influence of broadband transmission channels, and the problem of the need to reduce system complexity in broadband communication is solved.

Description

technical field [0001] The invention relates to a baseband signal modulation and demodulation method applied to broadband wireless communication in the field of wireless communication. The requirements of these communication systems for modulated signals are that they can effectively resist frequency selective fading caused by multipath propagation. Background technique [0002] In broadband wireless mobile communication systems, information is transmitted in space through modulated electromagnetic waves to reach the receiver. Due to the complex communication environment, electromagnetic waves are affected by reflection, diffusion, and scattering during space transmission, and multiple received signals with different delays and signal strengths will be generated at the receiver, making the communication channel have time-varying frequency selective fading. characteristic. In order to effectively eliminate the frequency-selective fading of broadband communication channels, m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 张剑周兴建卢建川
Owner 10TH RES INST OF CETC
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