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OFDM communication device and guard interval length determining method

A technology of guard interval and communication device, which is applied in the directions of multiplexing communication, separation device of transmission path, pilot signal distribution, etc., and can solve problems such as communication speed drop.

Inactive Publication Date: 2009-08-05
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, as the guard interval becomes longer,

Method used

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  • OFDM communication device and guard interval length determining method
  • OFDM communication device and guard interval length determining method
  • OFDM communication device and guard interval length determining method

Examples

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Embodiment Construction

[0029] Embodiments of the present invention will be described with reference to the drawings.

[0030] figure 1 It is a diagram showing the system configuration and functional blocks of the OFDM communication device 10 according to the present embodiment. As shown in this figure, OFDM communication device 10 functionally includes RF (Radio Frequency, radio frequency) / IF (Inter-frequency, intermediate frequency) / BB (Base Band, base band) section 11, GI deletion section 12, FFT (Fast Fourier Transform , fast Fourier transform) section 13, correlation calculation section 14, known signal holding section 15, demodulation / decoding section 16, received data acquisition section 17, symbol delay amount acquisition section 18, expected signal power acquisition section 19, symbol delay The interference wave power acquisition unit 20, the frequency fluctuation amount information acquisition unit 21, the frequency fluctuation noise power acquisition unit 22, the GI length determination / i...

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Abstract

An OFDM communication device (10) is characterized in including an RF/IF/BB unit (11) for receiving a series of symbols, a frequency fluctuating quantity information acquiring unit (21) for acquiring frequency fluctuating quantity information indicative of a frequency fluctuating quantity of the series of the received symbols and a GI length determining and instructing unit (23) for determining a GI length in accordance with frequency fluctuating quantity information acquired by the unit (21) and instructing a transmitting device of carrying out a symbol transmission with the determined GI length.

Description

technical field [0001] The invention relates to an OFDM communication device and a method for determining the length of a guard interval. Background technique [0002] In OFDM (Orthogonal Frequency Division Multiplexing), if there is a delay component in a certain symbol (symbol), the delay component will become an interference wave to the subsequent symbol, reducing the SINR (signal frequency) of the subsequent symbol. To interference and noise ratio: Signalto Interference and Noise Ratio). In order to prevent this, a guard interval (GI: Guard Interval) is provided at the header of the symbol. [0003] Patent Document 1 describes a technology for controlling the guard interval length according to the amount of delay components. In general, as the guard interval becomes longer, the SINR increases, but the communication speed decreases. In this technique, the communication speed is maximized by requesting the necessary minimum SINR when determining the guard interval lengt...

Claims

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Application Information

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IPC IPC(8): H04J11/00H04J1/00H04B1/40H04B1/3822
CPCH04L5/0007H04L27/2605H04L5/006H04L5/0048H04L27/2662H04L27/26
Inventor 佐原彻
Owner KYOCERA CORP
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