Orthogonal frequency division multiplexing signal transmitting method for reducing the inter-cell interference

An orthogonal frequency division and signal multiplexing technology, applied in the field of wireless information transmission, can solve problems such as high implementation complexity and co-channel interference

Inactive Publication Date: 2007-09-12
PANASONIC CORP
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Problems solved by technology

If the carrier used by a certain cell changes, it is necessary to reconfigure the carriers of all adjacent cells, and the implementation complexity is high
At the same time, when the user terminal is located at the edge of the cell, the multi-antenna signal transmission mode of adjacent base stations will bring serious co-channel interference

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  • Orthogonal frequency division multiplexing signal transmitting method for reducing the inter-cell interference
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  • Orthogonal frequency division multiplexing signal transmitting method for reducing the inter-cell interference

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Embodiment Construction

[0026] 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.

[0027] Figure 1 shows an example of a cellular MIMO system. As shown in Figure 1, a multi-cell OFDM system usually adopts a hexagonal cellular shape. Each cell is surrounded by six adjacent cells. Each base station covers a cell, and user terminals located in the corresponding cell communicate with the base station.

[0028] Generally speaking, the downlink transmission from the base station to the user terminal adopts the OFDM method. Fig. 2 shows a schematic diagram of an OFDM transmitting-receiving device. The t...

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Abstract

The present invention provides a method of OFDM signal transmission using for lower cellular OFDM district intersymbol interference, characterized by the adjacent edge of the area using different duration of time domain pulse OFDM signal, and its inverse Fourier transform, as the carrier frequency in the appearance of a peak, the other carrier in the low frequency range at the peak within 3 dB. In this way, through OFDM the design of domain pulse signal waveform launches inter-district carrier waveform differences and orthogonal. When a district-carrier distribution changes, the district does not require adjustment other carrier. At the same time, using the of the different characteristics of launch wave pulse duration to deal with the users in the same district, the short duration of the pulse allocated to the high-speed users, the pulse lasted for a long time allocated to the low-rate users. As a result, businesses can support multi-rate, and when a user rate changes, only need to change adjustments allocated to the user's carrier, reduce system complexity.

Description

technical field [0001] The invention relates to the field of wireless information transmission, in particular to information transmission systems such as wireless local area network, fixed wireless access, mobile communication, and terrestrial digital television broadcasting using Orthogonal Frequency Division Multiplexing (OFDM) technology. More specifically, the present invention relates to an Orthogonal Frequency Division Multiplexing (OFDM) signal transmission method that reduces inter-cell interference. 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, a new generation of wireless communication system needs to be developed, and it will widely adopt some new technologies, such as Orthogonal Frequency Division M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04Q7/22
CPCH04L27/2608H04L5/023H04L5/0044
Inventor 黎海涛李继峰
Owner PANASONIC CORP
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