Methods for transmitting and receiving data and devices for transmitting and receiving data based on orthogonal frequency division multiplexing technology
A technology of orthogonal frequency division and technology, applied in the receiving method and device, and in the field of data transmission based on orthogonal frequency division multiplexing technology, can solve the problem that the data rate exceeds the transmission capacity, etc., and achieve the effect of reducing the sampling rate and saving costs
Active Publication Date: 2012-11-21
ZTE CORP
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[0009] In view of this, the embodiment of the present invention provides a data transmission and reception method and device based on OFDM technology, which is used to solve the problem that the data rate transmitted on the optical fiber may exceed the transmission capacity of the optical fiber during data transmission in a distributed structure base station. The problem
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[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0018] figure 1 The data transmission process based on the OFDM downsampling rate technology provided by the embodiment of the present invention, the process includes the following steps:
[0019] S101: Map the received data to be sent in the frequency domain to an input terminal of an inverse fast Fourier transform, IFFT.
[0020] Specifically, in the embodiment of the present invention, when mapping the data to be transmitted in the frequency domain to the input terminal of the IFFT, it is necessary to determine the number of 0s added to the input te...
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The invention discloses methods for transmitting and receiving data and devices for transmitting and receiving data based on an orthogonal frequency division multiplexing (OFDM) technology. According to the method, a maximum sampling rate supported by a data transmission system is determined according to the number of antennas of the data transmission system, data bit width, and optical fiber transmission capacity of the data transmission system. A maximum length of IFFT / FFT is determined according to the determined maximum sampling rate. A value chosen from an interval determined by a subcarrier number and the maximum length is being as length information of the IFFT / FFT, and IFFT (inverse fast Fourier transform) and FFT (fast Fourier transform) are performed according to the length information, thereby effectively reducing sampling rate of the system, ensuring that a data transmission rate in an optical fiber is no more than transmission capacity of the optical fiber, and achieving a purpose of saving equipment cost.
Description
technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a data sending and receiving method and device based on Orthogonal Frequency Division Multiplexing (OFDM) technology. Background technique [0002] With the continuous development of mobile cellular technology, broadband technology, and multimedia technology, voice services and low-speed data services have been unable to meet user needs. Therefore, in order to better serve users, a variety of value-added services have been developed, such as multimedia MMS, games, mobile video, TV services, etc. These broadband services are generally transmitted through the high-speed transmission technology OFDM technology. [0003] The key to adopting OFDM technology is modulation and demodulation, and modulation and demodulation are realized through Fourier inverse transform and Fourier transform respectively. And in order to reduce the computational complexity of modul...
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IPC IPC(8): H04L27/26
CPCH04L27/263H04L27/265H04L27/2607H04L27/2651
Inventor 李明明任大孟耿鹏李杰张玉婷
Owner ZTE CORP