Uplink FDMA access method in frequency selected block transmission system

A technology of block transmission and frequency division multiple access, applied in transmission systems, digital transmission systems, frequency division multiplexing system components and other directions, can solve the problem of high complexity, 1/2, 1/3 or even lower , system efficiency reduction, etc.

Inactive Publication Date: 2006-07-19
SHANDONG UNIV
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  • Description
  • Claims
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Problems solved by technology

In order to make full use of channel state information, a large number of adaptive OFDMA techniques have been proposed, but the complexity is too high
Although the above second scheme is better in frequency selective fading channels, it will still be greatly affected by frequency selective fading. Generally, it is necessary to combine erro

Method used

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  • Uplink FDMA access method in frequency selected block transmission system
  • Uplink FDMA access method in frequency selected block transmission system
  • Uplink FDMA access method in frequency selected block transmission system

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Embodiment

[0100] The orthogonal transform used in the embodiment is an M-point discrete Fourier transform, and the corresponding orthogonal inverse transform is an M-point inverse discrete Fourier transform. The embodiment does not perform block processing on the M-point DFT and IDFT.

[0101] Accompanying drawing has provided the system block diagram realizing the proposed method of the present invention, and each module effect is as follows:

[0102] Source module 1: a general module that generates data to be transmitted. According to the results returned by the multiple access module 23 and the reverse channel 21, data of a length corresponding to the selected number M of available sub-channels is generated.

[0103] 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.

[0104] M-point FFT transformation module 3: a general module, which transforms ...

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Abstract

The invention relates to a ascending chain circuit frequency division multiple access method of select frequency segmented transmission system, which comprises following steps: 1, accessing the mobile station into base station; the base station distributes a group of sub channels to it, and sends the information to the mobile station to request the mobile station to send the auxiliary data of channel estimation; 2, the base station processes the channel estimation to attain the channel condition of sub channel group to select the available sub channel and send the mark information of sub channel group to the mobile station; 3, the mobile station processes the orthogonal transformation on the sent signal into the time domain to be sent, and send the signal with information to the base station; 4, the base station transforms the received sampling signal to the frequency domain and frequency balances the received signal to select the available signal to attain the information data; 5, according to the demand, the base station changes the sub channel group in the communication; and the mobile station according to received information to communicate with the base station. The invention can solve the access problem when the ascending chain circuit is in the time varying condition.

Description

(1) Technical field [0001] The invention relates to a broadband digital communication transmission method. The invention 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 atte...

Claims

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Application Information

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IPC IPC(8): H04J1/10H04L27/00
Inventor 杜岩孙小钧刘蕾蕾王丽丽
Owner SHANDONG UNIV
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