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OFDM-based data transmission method and system

A data transmission method and data technology, applied in the field of OFDM-based data transmission method and system, capable of solving problems such as increasing equipment costs

Inactive Publication Date: 2012-11-21
BEIJING NUFRONT MOBILE MULTIMEDIA TECH
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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-based data transmission method and system
  • OFDM-based data transmission method and system
  • OFDM-based data transmission method and system

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Embodiment Construction

[0110] 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. Assume that the basic sub-band is 20MHz, and the transceiver bandwidth of the receiving station (AP) can be 20 MHz, 40 MHz, and 80 MHz. That is, the STA receiver that only supports 20MHz bandwidth can also send and receive signals of APs with 80MHz bandwidth. In this way, this Based on the OFDM modulation technology, the invention can realize multiple STAs using different sub-b...

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Abstract

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) data transmission method, which is used for transmitting uplink data in a short or medium distance in a wireless communication system and dividing an available band of the system into N basic sub-bands in advance. The method comprises the following steps: a transmitting station occupies M basic sub-bands and modulates data to the M basic sub-bands to transmit the data; and a receiving station receives one or more data from the transmitting station within the range of the N basic sub-bands, where M is less than or equal to N, and both M and N are positive integer. The invention further provides an OFDM-based data transmission system. By the combination of the OFDM technology and the sub-bands, different bandwidth configurations in the transmitting station and the receiving station of the wireless communication system are allowed; the transmitting station can be in a low configuration to reduce the hardware cost, while the receiving station can in a high configuration to improve the efficiency, spectral efficiency, throughput rate and the like and further implement simultaneous communication between an access point and a plurality of user stations.

Description

[0001] This application claims that the filing date is 2011.3.25, the application number is 201110074380.X, and the title of the invention is an OFDM-based data transmission method and system. reflected in. 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 STAs cannot access the access point AP at the same time, but can only be distributed separately. 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 the 20MHz subbands ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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