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Method and system for transmitting data based on Orthogonal Frequency Division Multiplexing (OFDM)

A data transmission method and technology for a data transmission system, which are applied in the field of OFDM-based data transmission methods and systems, can solve problems such as increasing equipment costs, and achieve the effects of improving efficiency, reducing hardware implementation costs, and avoiding interference.

Inactive Publication Date: 2012-07-18
BEIJING NUFRONT MOBILE MULTIMEDIA TECH
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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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  • Method and system for transmitting data based on Orthogonal Frequency Division Multiplexing (OFDM)
  • Method and system for transmitting data based on Orthogonal Frequency Division Multiplexing (OFDM)
  • Method and system for transmitting data based on Orthogonal Frequency Division Multiplexing (OFDM)

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Embodiment Construction

[0021] 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

The invention discloses a method for transmitting data based on Orthogonal Frequency Division Multiplexing (OFDM), which is applied to transmission of uplink data of middle-distance and short-distance wireless communication systems and is characterized in that: available frequency band of the system is equally divided into N basic sub-frequency bands in advance, wherein the method comprises the following steps: a transmitting site transmits data to a receiving site by a single sub-frequency band or M combined sub-frequency bands, wherein M is equal to 2*n; the transmitting site employs a sampling rate of fs or M*fs of a baseband sample; the receiving site receives data sent from one or a plurality of transmitting sites in the available frequency band; and the receiving site employs a sampling rate of N*fs of the baseband sample. The invention further provides a system for transmitting data based on the OFDM. The method and the system are based on the OFDM technology and combined use of the sub-frequency bands; according to the method and the system, the transmitting site and the receiving site in the wireless communication system are permitted to have different bandwidth configurations, the transmitting site can utilize lower configuration while the receiving site can utilize higher configuration, thereby improving the efficiency, the spectrum efficiency, the throughput rate, etc.; in addition, a plurality of user sites communicating with an access point simultaneously can be realized.

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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IPC IPC(8): H04L27/26
CPCH04L27/2636H04L5/0037
Inventor 曾勇波雷俊王竞姚惠娟闫志刚鲍东山
Owner BEIJING NUFRONT MOBILE MULTIMEDIA TECH
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