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A data transmission method and system based on OFDM

By dividing the frequency band of the wireless communication system into basic sub-bands and using OFDM technology, STA and AP are allowed to have different bandwidth configurations, which reduces hardware costs, improves spectrum utilization and throughput, and solves multi-user access and synchronization problems. .

Active Publication Date: 2017-03-29
BEIJING NUFRONT MOBILE MULTIMEDIA TECH
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  • Summary
  • 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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Embodiment Construction

[0022] In view of the deficiencies in the prior art, the present invention proposes a multi-user data transmission scheme for medium and short-distance wireless communication, which adopts a multi-user access method similar to Orthogonal Frequency Division Multiple Access (OFDMA), based on OFDM and corresponding synchronization The mechanism divides the available frequency band of the system into N basic sub-bands. The bandwidth of the transmitter (STA) transceiver can be a basic sub-band or a combination of sub-bands, and the bandwidth of the receiving station (AP) transceiver can be N basic sub-bands, assuming that the basic sub-band is 20MHz, the receiving site (AP) transceiver bandwidth can be 20MHz, 40MHz, 80MHz, that is, for STA receivers that only support 20MHz bandwidth, they can also send and receive AP signals with 80MHz bandwidth, In this way, based on the OFDM modulation technology, the present invention can realize multiple STAs using different sub-band resources t...

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Abstract

Disclosed is an OFDM-based method for transmitting data, for use in a short-to-mid range wireless communication system uplink data transmission. An available frequency band of the system is equally divided into N number of basic frequency sub-bands. The method comprises: an transmitting station using a single frequency sub-band or a combination of M number of frequency sub-bands to transmit data to a receiving station, where M = 2n; the transmitting station using fs or M*fs as the baseband sample sampling rate; the receiving station receiving within the available frequency band the data transmitted by the one or multiple transmitting stations; and the receiving station using N*fs as the baseband sample sampling rate. Also provided in the present invention is an OFDM-based system for transmitting data. In the present invention, the OFDM-based technology and employment of the combination of frequency sub-bands allow for the transmitting station and the receiving station in a wireless communication system to have different bandwidth configurations, thus allowing for employment of a lower configuration by the transmitting station to reduce hardware costs, and for employment of a higher configuration by the receiving station to improve efficiencies such as frequency spectrum utilization rate and throughput, also allowing for multiple user stations to communicate simultaneously with an access point.

Description

[0001] This application claims that the filing date is March 25, 2011, the application number is 201110074380.X, and the title of the invention is an OFDM-based data transmission method and system. reflected in this application. 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 station STAs cannot access the access point AP at the same time, but can only be distributed Even if the AP has free spectrum resources, STAs cannot use them. For example, in an 802.11n system, an AP can occupy 40MHz bandwidth resources and can be divided into two 20MHz subbands. A STA can only use the entire 40MHz bandwidth or one of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L5/0037H04L27/2636
Owner BEIJING NUFRONT MOBILE MULTIMEDIA TECH
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