Time reversal orthogonal FDM (Frequency-Division Multiplexing) wireless communication method based on SFME (Solvent Free Microwave Extraction)

A time inversion and orthogonal frequency division technology, applied in multi-frequency code systems, baseband system components, shaping networks in transmitters/receivers, etc. Increased complexity, etc.

Active Publication Date: 2015-05-20
武汉铭为电子科技有限公司
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Problems solved by technology

Research shows that this method can effectively improve the performance of the TR wireless transmission system, but as the number of multipaths in the wireless channel increases, the amount of calculation and complexity required for the equalization technology will increase sharply, and it is not suitable for OFDM high-speed wireless communication systems

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  • Time reversal orthogonal FDM (Frequency-Division Multiplexing) wireless communication method based on SFME (Solvent Free Microwave Extraction)
  • Time reversal orthogonal FDM (Frequency-Division Multiplexing) wireless communication method based on SFME (Solvent Free Microwave Extraction)
  • Time reversal orthogonal FDM (Frequency-Division Multiplexing) wireless communication method based on SFME (Solvent Free Microwave Extraction)

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Embodiment Construction

[0039] The specific examples will be further described below in conjunction with the accompanying drawings, so as to understand the features and advantages of the present invention more clearly.

[0040] This embodiment assumes that the impulse response of the wireless channel 109 is known at the transmitting end, such as image 3 The number of taps shown is 141. And the frequency spectrum of the OFDM signal is within the spectrum range of the wireless channel.

[0041] figure 1 Shown is the functional block diagram of the SFME-TR-OFDM wireless communication system of the present invention, and Table 1 shows the main parameters of the system.

[0042] Table 1 Main parameters of SFME-TR-OFDM wireless communication system

[0043]

[0044] The data source 101 generates a serial random binary bit stream, and after serial-to-parallel conversion in step 102, the parallel bit data rate becomes 1 / N of the serial rate. After the QPSK modulation (mapping) process of step 103, th...

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Abstract

The invention relates to a time reversal orthogonal FDM (Frequency-Division Multiplexing) wireless communication method based on SFME (Solvent Free Microwave Extraction). The method comprises the following steps of generating serial random binary bit stream by a data source; performing serial-parallel conversion so as to ensure that the parallel bit data velocity is changed to be 1 / N of serial velocity; performing QPSK (Quadrature Phase Shift Keying) modulation treatment so as to ensure that the parallel bit sequence is changed into a parallel complex number sequence dn=an+jbn; before performing quadrature modulation, performing amplitude weighting on dn by use of a subcarrier frequency domain amplitude equalizer; performing IFFT, cyclic prefix adding and serial-parallel conversion treatment on a parallel signal obtained by the subcarrier frequency domain amplitude equalizer, then transmitting the signal to a wireless channel by virtue of a time reversor; and performing corresponding OFDM (Orthogonal Frequency Division Multiplexing) demodulation on the received signal at a receiving terminal. According to the method, the side lobe of the focused time domain of each subcarrier time reversal signal is eliminated, so that coherent multipath interference of an OFDM system in an abundant scattering environment is eliminated, the code error rate of the system is reduced, and the defect that a multipath equalizer needs to be adopted in a traditional communication system to perform channel equalization is overcome.

Description

technical field [0001] The invention belongs to the field of wireless communication technology, and relates to OFDM wireless communication technology, in particular to a time-reversal OFDM based on sub-carrier frequency-domain magnitude equalization (Sub-Carrier Frequency-Domain Magnitude Equalization, SFME) By wireless communication method. Background technique [0002] Orthogonal frequency division multiplexing (OFDM) technology uses mutually orthogonal subcarriers in the frequency domain to modulate parallel data, and has high spectral efficiency. In actual communication, Inverse Fast Fourier Transform (IFFT) and Fast Fourier Transform (FFT) are respectively applied to realize orthogonal modulation and demodulation, which can reduce system complexity. The biggest advantage of OFDM technology is that it can still obtain high performance even in frequency-selective fading channels, and the use of cyclic prefix can resist inter-subcarrier interference. However, OFDM requir...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 赵德双陈志新刘海勇李祥
Owner 武汉铭为电子科技有限公司
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