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OFDM (Orthogonal Frequency Division Multiplexing)-based data transmission method, transmitting sites and receiving site

A data transmission method and technology for receiving sites, which are applied to digital transmission systems, transmission systems, and multiple use of transmission paths, can solve problems such as increasing equipment costs, and achieve the goal of avoiding interference, reducing hardware implementation costs, and improving spectrum utilization. Effect

Active Publication Date: 2016-05-04
GUANGDONG NUFRONT COMP SYST CHIP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the wireless local area network system, if the multiple access method of OFDMA is used in order to improve the spectrum efficiency, the equipment cost will be increased.

Method used

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  • OFDM (Orthogonal Frequency Division Multiplexing)-based data transmission method, transmitting sites and receiving site
  • OFDM (Orthogonal Frequency Division Multiplexing)-based data transmission method, transmitting sites and receiving site
  • OFDM (Orthogonal Frequency Division Multiplexing)-based data transmission method, transmitting sites and receiving site

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Embodiment Construction

[0044] The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. These embodiments of the present invention may be referred to herein, individually or collectively, by the term "invention", which is for convenience only and is not intended to automatically limit the application if in fact more than one invention is disclosed The scope is any individual invention or inventive concept.

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Abstract

The invention provides an OFDM (Orthogonal Frequency Division Multiplexing)-based data transmission method for enabling J transmitting sites to transmit data to one receiving site at the same time. J is a positive integer. The method comprises steps: the receiving site divides an available frequency band into N basic sub frequency bands, independently-occupied Mj basic sub frequency bands are scheduled for each of the J transmitting sites, j is a positive integer between 1 and J, and the sum of M1+M2+...+MJ is no more than N; the cyclic prefix length TCP of the system is set to be no less than 2delta+ taum, wherein the 2delta is two-way propagation delay when a signal arrives at the maximum allowable coverage radius from the transmitting sites, and the taum is multipath delay spread; each of the J transmitting sites adds a cyclic prefix with a length of TCP to each to-be-transmitted data, and the data are then modulated to the independently-occupied Mj basic sub frequency bands and then transmitted; and the receiving site receives the data transmitted by the J transmitting sites at the same time in the N basic sub frequency band range, and data transmitted by each transmitting site are extracted according to the cyclic prefix with a preset length of TCP. The method of the invention allows unequal bandwidth capacity communication, and allows multi-user simultaneous access.

Description

[0001] This application is a divisional application of the parent application with an application date of March 23, 2012, an application number of 201280012991.4, and an invention title of "An OFDM-based data transmission method and transmission site". technical field [0002] The present invention relates to the technical field of wireless communication, in particular to an OFDM-based data transmission method and system. Background technique [0003] In the wireless local area network (WLAN) technology based on 802.11 series standards, multi-user transmission is realized through Carrier Sense Multiple Access (CSMA, Carrier Sense Multiple Access), that is, multiple stations (STA) cannot access the access point (CAP) at the same time, only Time-division access, even if the CAP has idle spectrum resources, STAs cannot use them. For example, in an 802.11n system, the CAP can occupy 40MHz bandwidth resources and can be divided into two 20MHz subbands. The STA can only use the en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L27/26H04W72/12
CPCH04L5/001H04L5/0037H04L27/2626H04L27/2647H04W72/12H04W72/23
Inventor 鲍东山雷俊刘慎发
Owner GUANGDONG NUFRONT COMP SYST CHIP
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