Method for obtaining sub-information channel modulation code and data transmission method for wireless local area network

A data transmission method and modulation and coding technology, which are applied in the field of sub-channel modulation and coding in wireless local area networks, can solve the problem that a WLAN system cannot directly apply sub-channels, etc., so as to overcome frequency selectivity, improve system performance, and ensure backward compatibility. Effect

Active Publication Date: 2010-10-27
BEIJING NUFRONT MOBILE MULTIMEDIA TECH
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Problems solved by technology

However, the existing WLAN system cannot directly ap

Method used

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  • Method for obtaining sub-information channel modulation code and data transmission method for wireless local area network
  • Method for obtaining sub-information channel modulation code and data transmission method for wireless local area network
  • Method for obtaining sub-information channel modulation code and data transmission method for wireless local area network

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Embodiment Construction

[0018] In view of the fact that the existing WLAN system uses the same modulation method for all these sub-carrier channels in data transmission, resulting in waste of channel gain on sub-carrier channels with high channel gain, and error prone to occur on sub-carrier channels with low channel gain. Different modulation methods can be selected for each subcarrier or subcarrier group (in the following description, this subcarrier / subcarrier group is referred to as subchannel) according to the size of its signal-to-noise ratio, that is, for a high signal-to-noise ratio High-order modulation is used for sub-channels with low signal-to-noise ratio; low-order modulation is used for sub-channels with low signal-to-noise ratio; and no data transmission is required for sub-channels with particularly low channel gain. 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 transmiss...

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Abstract

The invention discloses a method for obtaining a sub-information channel modulation code, comprising the following steps: sending a request message requiring for providing sub-information modulation code information to an opposite terminal station, wherein the request message contains a control field in a preset format, and the control field comprises a sub-information channel modulation code information request, a training request, an MCS request or an antenna selection indication, an MCS feedback and an antenna selection order/data; and receiving a response message from the opposite terminal station, wherein the response message comprises a data frame structure packaged with sub-information channel modulation code information in the preset format, the sub-information channel modulation code information data frame is carried with spatial stream information, sub-information channel modulation mode and encoding speed of each spatial stream, and subcarrier grouping information. In the invention, frame structure and frame interactive sequence are designed reasonably, and adaptive modulation encoding on each sub-information channel which is composed of subcarrier groupings is supported, thereby effectively overcoming frequency selectivity of a system, improving system performance, and securing backward compatibility with current system to the greatest extent.

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, and in particular to a method for obtaining sub-channel modulation and coding in a wireless local area network and a data transmission method. 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 su...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L1/06H04L1/00H04L25/03
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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