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 field of data transmission and reception methods and devices 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: 2015-04-01
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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Disclosed are an OFDM technology-based method and device for transmitting and receiving data. In the method, when transmitting data, a maximum sampling rate supported by a data transmission system is determined on the basis of the number of antennae in the data transmission system, of the data width, and of the optical fiber transmission capacity of the data transmission system; the maximum length of an IFFT / FFT is determined on the basis of the maximum sampling rate determined; a value is selected within the interval between the number of sub-carriers and the maximum length as length information of the IFFT / FFT; and the IFFT and the FFT are performed on the basis of the length information. This allows for effectively reduced sampling rate for the system, thus ensuring that the data transmission speed of the optical fiber does not exceed the transmission capacity of the optical fiber, and achieving the goal of conserving equipment costs.
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