Prefix channel data transmitting method and apparatus in frequency division multiplexing system

Abstract

The invention discloses a method for transmitting prefix channel data in a frequency division multiplexing system. The method comprises the following steps: firstly, the data to be transmitted of the prefix channel of each section is modulated into modulation symbols; then the modulation symbols of the identical prefix channel of the identical section are dispersively mapped on sub-carrier frequency resources; and finally, the modulation symbols of the prefix channels of the sections are transmitted after being mapped. The invention also discloses a device for transmitting prefix channel datain a frequency division multiplexing system. By adopting the technical proposal, the frequency diversity gain can be increased, and the ability of the system of overcoming the negative influence brought by the selective fading of the frequency can be further enhanced.

Description

technical field [0001] The present invention relates to a frequency division multiplexing system, in particular to a method and a sending device for prefix channel data in the frequency division multiplexing system. Background technique [0002] In the OFDM (Orthogonal Frequency Division Multiplexing) system, the transmitting end modulates the data to be transmitted from the frequency domain signal to the time domain signal, and then transmits it on the channel, while the receiving end performs reverse process demodulation . The modulation and demodulation of the OFDM system can be implemented by inverse discrete Fourier transform (Inverse Discrete Fourier Transform, IDFT) and discrete Fourier transform (Discrete Fourier Transform, DFT), respectively. At the sending end, through N-point IDFT operation, the frequency domain data symbols are converted into time domain data symbols, and then sent to the channel after carrier modulation; at the receiving end, the received signa...

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Problems solved by technology

The inventor found in the process of realizing the present invention that in the prior art, the F-PBCCH data of each sector is mapped to an area segment including several continuous subcarriers for transmission. According to the principle of diversity gain, an area segment The frequency diversity gain on several consecutive sub-carriers is small, so the system's ability to overcome the negative effects of frequency selective fading is poor

Other pre-preamble channels in the prefix frame, such as F-SBCCH or F-QPCH, only occupy a different number of OFDM symbols than F-PBCCH, and are also mapped to a certain number of consecutive subcarriers in the frequency domain. Area segment sending, such as image 3 The schematic diagram of F-SBCCH data mapping shown, so there is also the problem of small frequency diversity gain

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