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Down link frequency division multiple access switching in method of frequency selecting block transmitting system

A technology of block transmission and downlink, applied in the field of broadband wireless communication

Inactive Publication Date: 2006-10-18
SHANDONG UNIV
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

[0021] Aiming at the problems existing in the prior art, the present invention proposes a downlink frequency division multiple access method of a frequency-selective block transmission system, which can greatly improve the bit error performance of the system with little increase in complexity , which can significantly improve the spectral efficiency of the system

Method used

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  • Down link frequency division multiple access switching in method of frequency selecting block transmitting system
  • Down link frequency division multiple access switching in method of frequency selecting block transmitting system
  • Down link frequency division multiple access switching in method of frequency selecting block transmitting system

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Embodiment

[0108] The orthogonal transform adopted in the embodiment is an M-point discrete Fourier transform, and the corresponding inverse orthogonal transform is an M-point inverse discrete Fourier transform. The embodiment does not perform block processing on the M-point DFT and IDFT.

[0109] Accompanying drawing has provided the system block diagram realizing the proposed method of the present invention, and each module effect is as follows:

[0110] Source module 1: a general module that generates data to be transmitted. According to the results returned by the multiple access module 24 and the reverse channel 22, data groups with a length corresponding to the number of available sub-channels selected by each mobile station are respectively generated.

[0111] Symbol mapping module 2: a general module, which maps the data generated by the source to the corresponding points of the constellation diagram according to the modulation method adopted.

[0112] M-point FFT transformatio...

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Abstract

A method for switching in downlink TDMA of frequency selection unblocking transmission system includes initializing distribution of subchannel set, sending an auxiliary data to mobile table switched in current base station ( BS ) by BS, selecting flag information and sending it to BS by mobile table, carrying out orthogonal transform on modulated signal of mobile table and setting up downlink of communication from BS to mobile table by BS, transforming sampled signal to frequency domain and selecting out usable signal by mobile table, changing subchannel set by BS according to requirement and carrying out communication with BS by mobile table according to received information.

Description

(1) Technical field [0001] The invention relates to a broadband digital communication transmission method and belongs to the technical field of broadband wireless communication. (2) Background technology [0002] Communication technology has developed rapidly in recent decades, especially since the 1990s, and has had a profound impact on people's daily life and the development of the national economy. The future communication technology is developing in the direction of broadband and high speed, so many broadband digital transmission technologies have received extensive attention, such as Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM: Orthogonal Frequency Division Multiplexing) and frequency domain balanced -FDE: Single Carrier with Frequency Domain Equalization) are two broadband digital transmission technologies that are valued by people. They both belong to block transmission technology. At present, OFDM has received far more attention than S...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04W4/20
Inventor 杜岩王丽丽孙小钧刘蕾蕾
Owner SHANDONG UNIV
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