A data transmission method, transmitting site and receiving site based on OFDM

A data transmission method and a technology for receiving stations, which are applied in the direction of digital transmission systems, transmission systems, and multiple uses of transmission paths, etc., can solve problems such as increasing equipment costs, and achieve the goals of avoiding interference, improving spectrum utilization, and reducing hardware implementation costs Effect

Active Publication Date: 2018-09-21
GUANGDONG NUFRONT COMP SYST CHIP
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A data transmission method, transmitting site and receiving site based on OFDM
  • A data transmission method, transmitting site and receiving site based on OFDM
  • A data transmission method, transmitting site and receiving site based on OFDM

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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 present invention provides a data transmission method based on OFDM, which is used for J transmitting sites to transmit data to a receiving site at the same time, J is a positive integer, including: the receiving site divides the available frequency band into N basic sub-bands, which are J Transmitting sites schedule their exclusive Mj basic sub-bands, j∈[1, J], j is a positive integer; set the length of the system cyclic prefix to TCP≥2δ+τm, 2δ is the maximum coverage radius allowed by the signal from the transmitting site Experienced two-way propagation delay, τm multipath delay extension; J transmitting sites respectively add a cyclic prefix of TCP length to the data to be sent and modulate them to their exclusive Mj basic sub-bands; The data sent by J transmitting sites are simultaneously received within the range of the basic sub-band, and the data sent by each transmitting site is extracted according to the preset cyclic prefix whose length is TCP. The method allows bandwidth-capable asymmetric communication while allowing simultaneous access by multiple users.

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 simultaneously access the access point (CAP) , only time-sharing access is available, 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...

Claims

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Application Information

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Patent Type & Authority Patents(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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