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Reconstructional OFDM system and its operation method for transmitting and receiving

A technology of sending end and receiving end, applied in the field of OFDM system

Inactive Publication Date: 2007-02-07
PANASONIC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The object of the present invention is to provide a kind of OFDM system and its operation method adaptable to channel environment change, for overcoming the shortcoming of fixed CP in the traditional OFDM system

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  • Reconstructional OFDM system and its operation method for transmitting and receiving
  • Reconstructional OFDM system and its operation method for transmitting and receiving
  • Reconstructional OFDM system and its operation method for transmitting and receiving

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that the described embodiments are for the purpose of illustration only, and do not limit the scope of the present invention. The various numerical values ​​described are not intended to limit the present invention, and these numerical values ​​can be appropriately modified according to the needs of those of ordinary skill in the art.

[0029] In the traditional OFDM system, the baseband information bit stream is encoded, modulated, serial-to-parallel converted, and sent to multiple subcarriers, and the data of each subcarrier is subjected to Inverse Discrete Fourier Transform (IDFT) and radio frequency amplification before being sent. To eliminate inter-symbol interference (ISI), a cyclic prefix (CP) is inserted between OFDM symbols as a guard interval. At the receiving end, after deleting the CP, the discrete Fourier transform (DFT) is used to dem...

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Abstract

The invention relates to an OFDM system which can be rebuilt, wherein in said system, using received pilot signal, estimating the maximum time delay extending mean square root and Doppler frequency shift of said signal channel, based on which, fixing the upper and lower limits of time period of OFDM mark and finding the period; the CP controllers of sender and receiver, based on the signal channel band width, the OFDM mark period and the band width efficiency factor, fixing the modulate carrier wave number of OFDM mark, the total sub carrier wave number and the sub carrier wave number occupied by the cycle prefix; using obtained OFDM parameter, controlling the operations of sender and receiver. The inventive system can self-adaptive adjust the cycle prefix and sub carrier wave, to improve the system frequency efficiency.

Description

technical field [0001] The invention relates to a reconfigurable Orthogonal Frequency Division Multiplexing (OFDM) system, in particular to an information transmission system using OFDM for wireless local area network, mobile communication, terrestrial digital TV broadcasting, and its sending and receiving operation method. Background technique [0002] With the gradual integration of wireless network, multimedia technology and the Internet, people have higher and higher requirements for the type and quality of wireless communication services. In order to meet the requirements of wireless multimedia and high-speed data transmission, it is necessary to develop a new generation of wireless communication system. In the new generation of wireless systems, from the physical layer, the media access control layer to the network layer, some new technologies will be widely used, such as Orthogonal Frequency Division Multiplexing (OFDM) and so on. [0003] OFDM divides the channel in...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/03
CPCH04L27/2607H04J13/18H04L27/2626
Inventor 黎海涛李继峰
Owner PANASONIC CORP
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