Method for realizing common function subfunction among OFDM (Orthogonal Frequency Division Multiplexing) system submodules
A technology of sub-functions and sub-modules, which is applied in the field of sub-functions to realize public functions of the physical layer, can solve the problems that multi-carrier modulation is not widely used and the frequency band utilization rate decreases, and achieve the effect of reducing implementation overhead and ensuring the number of multiplexing
Inactive Publication Date: 2011-04-06
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology
In the 1960s, people did a lot of theoretical work on multi-carrier modulation, demonstrating that the use of multi-carrier modulation on a band-limited channel with inter-symbol interference can optimize the transmission performance of the system; in January 1970, the patent on OFDM was published for the first time Published; In 1971, Weinstein and Ebert published the method of using discrete Fourier transform to realize multi-carrier modulation in IEEE (Institute of Electrical and Electronic Engineers, Institute of Electrical and Electronics Engineers) magazine; in the 1980s, people used multi-carrier modulation in high-speed modems, The application in the fields of digital mobile communication has been studied in depth, but due to the limitation of technical conditions at that time, multi-carrier modulation has not been widely used; in the 1990s, due to the advancement of digital signal processing technology and large-scale integrated circuit technology, OFDM The technology has received widespread attention in the field of high-speed data transmission; today, OFDM has been used in digital audio and video broadcasting in Europe (such as DAB and DVB), high-speed wireless LAN systems in Europe and North America (such as HIPERLAN2, IEEE 802.11a ), and high bit rate digital subscriber lines (such as ADSL, VDSL) have been widely used
[0004] (2) In the traditional frequency division multiplexing (FDM, Frequency Division Multiplexing) technology, each sub-channel does not overlap. In order to prevent interference between channels, a guard interval is added between channels, resulting in a decrease in frequency band utilization
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[0024] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.
[0025] The physical layer link structure of different systems in the communication system based on OFDM technology will be different due to different designs. Different sub-modules may use the same sub-function when implementing their functions. This sub-function is the difference between different sub-modules. public function subfunction. The symmetry of the transceiver link itself of the communication system further increases the possibility of common function sub-functions between different modules. By extracting the common function sub-functions between different sub-modules in the physical layer link and realizing their functions independently, they can be directly used in multiple sub-modules, which can minimize the system implementation overhead.
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The invention claims for protecting a method for realizing common function subfunction among OFDM (Orthogonal Frequency Division Multiplexing) system submodules, relating to a communication technology and realizing the multiplexing of the common function subfunction among communication system submodules based on an OFDM technology. In the OFDM system, with the symmetry of a receiving-transmitting link, different subsmodules use the same function subfunction when achieving the function; when a physical layer link of a communication system based on the OFDM is realized, firstly, the function subfunctions used by different submodules can be independently realized for a plurality of OFDM submodules required to use the function subfunctions to directly use, so that the expenditure for realizing the physical layer link of the OFDM communication system can be greatly reduced. The invention provides a simple and effective solution for multiplexing the application of the common function subfunction among the OFDM system submodules.
Description
technical field [0001] The present invention relates to the field of communication, in particular to a method for realizing a common function sub-function of a physical layer in an OFDM system. Background technique [0002] Multi-carrier transmission breaks the data stream into several independent sub-bit streams, each of which will have a much lower bit rate. Using the low-rate multi-state symbols formed by such a low bit rate to modulate the corresponding sub-carriers, a transmission system in which multiple low-rate symbols are sent in parallel is formed. OFDM is one of the implementations of a multi-carrier transmission scheme, and OFDM is also called discrete multi-tone (DMT, Discrete Multi-Tone) modulation. OFDM uses Inverse Fast Fourier Transform (IFFT, Inverse Fast Fourier Transform) and Fast Fourier Transform (FFT, Fast Fourier Transform) to respectively realize the channel characteristics of MIMO-OFDM systems. The idea of OFDM can be traced back to the late 1950...
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IPC IPC(8): H04L27/26H04L5/02
Inventor 张祖凡蒙玎温林海李校林陈前斌
Owner CHONGQING UNIV OF POSTS & TELECOMM