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Data transmission method for supporting sub-channel modulation coding and wireless local area network system

A data transmission method and wireless local area network technology, which is applied in the field of wireless communication and wireless local area network, can solve the problem that the WLAN system cannot directly apply sub-channels, etc., and achieve the effects of overcoming frequency selectivity, ensuring backward compatibility, and reducing bit errors

Active Publication Date: 2010-09-29
BEIJING NUFRONT MOBILE MULTIMEDIA TECH
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AI Technical Summary

Problems solved by technology

However, the existing WLAN system cannot directly apply the sub-channel modulation and coding technology

Method used

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  • Data transmission method for supporting sub-channel modulation coding and wireless local area network system
  • Data transmission method for supporting sub-channel modulation coding and wireless local area network system
  • Data transmission method for supporting sub-channel modulation coding and wireless local area network system

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Embodiment Construction

[0021] In view of the existing WLAN system in data transmission, the channel gain on the sub-carrier channel with high channel gain caused by using the same modulation method for all these sub-carrier channels will be wasted, and the channel gain on the sub-carrier channel with low channel gain will be wasted. , it is easy to generate bit errors, and different modulation methods can be selected for each subcarrier or subcarrier group (in the following description, this kind of subcarrier / subcarrier group is referred to as subchannel) according to the size of its signal-to-noise ratio, that is: for A sub-channel with a high SNR uses high-order modulation; a sub-channel with a low SNR uses low-order modulation; and a sub-channel with a particularly low channel gain does not need to transmit data. In this way, on the one hand, the channel gain on the high-gain sub-channel can be fully utilized to transmit data, and on the other hand, bit errors during data transmission on the low-...

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PUM

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Abstract

The invention discloses a data transmission method for supporting sub-channel modulation coding, which is used in a wireless local area network. The method comprises the following steps of: acquiring sub-channel modulation coding information which contains spatial stream information, sub-channel modulation mode of each spatial stream and coding rate through a first site; packing the sub-channel modulation coding information by adopting a physical layer data unit frame of a predetermined format; and sending a physical layer data unit of a predetermined format to a second site through the first site to demodulate the physical layer data unit frame so as to obtain received data. The invention also provides a corresponding wireless local area network system. As the modulation mode is selected according to the information condition of each sub-channel, the invention improves the data transmission efficiency, supports adaptive modulation coding on the sub-channel consisting of sub-carrier packets, effectively overcomes the frequency selectivity in the system, improves the performance of the system, and is backward compatible with the existing system.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to the technical field of wireless local area network, in particular to a data transmission method supporting sub-channel modulation and coding and a wireless local area network system. Background technique [0002] When the existing wireless local area network (WLAN, Wireless Local Area Network) system uses Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) for data transmission, the frequency selectivity of each subcarrier in the system is relatively low due to the influence of multipath. Obviously, that is: some subcarrier channels have high gain, while other subcarrier channel gain is very low. In the existing wireless local area network WLAN system, although a link adaptation mechanism is provided, this link adaptation can only represent the modulation method adopted by each spatial stream, and all subcarriers on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/26H04W84/12
Inventor 姚惠娟雷俊闫志刚刘慎发刘飞曾勇波鲍东山
Owner BEIJING NUFRONT MOBILE MULTIMEDIA TECH
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