Multi-carrier mode low-complexity channel noise-reducing method and device thereof in wireless local area network (WLAN)

一种无线局域网、低复杂度的技术，应用在信道估算、多频码系统、发射机/接收机中的整形网络等方向，能够解决解调性能差等问题

Active Publication Date: 2012-09-12
OMNIVISION TECH (SHANGHAI) CO LTD
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Problems solved by technology

After dividing the received long training sequence by the long training sequence in the frequency domain stored locally, the frequency domain channel response is obtained. Usually, this frequency domain channel will contain noise. Directly using this channel for subsequent demodulation operations will make the demodulation performance relatively Therefore, it is usually necessary to perform noise reduction processing on this noisy channel so that the system operating threshold can be improved

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  • Multi-carrier mode low-complexity channel noise-reducing method and device thereof in wireless local area network (WLAN)
  • Multi-carrier mode low-complexity channel noise-reducing method and device thereof in wireless local area network (WLAN)
  • Multi-carrier mode low-complexity channel noise-reducing method and device thereof in wireless local area network (WLAN)

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Embodiment Construction

[0028] In order to better understand the technical content of the present invention, specific embodiments are given together with the attached drawings for description as follows.

[0029]As mentioned above, the receiver will select the appropriate Wiener filtering method and coefficients according to the channel power delay characteristics in the actual transmission environment, that is to say, the receiver must estimate the channel impulse response in the time domain to perform multipath detection, but often the Weaker multipath components are not easy to be identified, so the present invention avoids the process of selecting Wiener coefficients by performing multipath detection on time-domain channels, and instead selects several groups of pre-stored Wiener coefficients according to the set The method performs Wiener filtering on the noisy frequency domain channel, and then uses certain criteria to select the Wiener coefficient and the corresponding filtering method that can...

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Abstract

The invention provides a multi-carrier mode low-complexity channel noise-reducing method and a device thereof in a WLAN. According to the method and the device thereof, a known long training sequence section and a highly protected signaling section are used for selecting an optimal impulse response of a channel frequency domain in a frame structure of the multi-carrier mode, and good working threshold of a receiver can be guaranteed in various delay spread environments at a cost of low complexity. By aid of the method, channel response of a time domain is not needed to be detected, but a preset Wiener filtering coefficient is used directly for reducing noise of frequency domain channels containing the noise, a relative optimal frequency domain channel certainly responds, then a follow-up received highly protected signaling sequence section is used for figuring out the frequency domain channel of the signaling section so as to select which one is the optimal, and the selecting criterion may be the minimum mean square error criterion.

Description

technical field [0001] The invention relates to the field of wireless communication, and in particular to a low-complexity channel noise reduction method and a device thereof applied to a multi-carrier mode of a wireless local area network. Background technique [0002] Signals in wireless communication systems are inevitably subject to multipath distortion caused by terrain and obstacles, and the time-varying channel impulse response is usually expressed as a time-domain discrete FIR filter form Therefore, complex multipath interference usually exists in the received broadband signal, which is manifested as frequency-domain selective fading in the frequency domain. Single-carrier systems usually use time domain equalization to remove multipath interference, which is complex for the receiver will be very high. [0003] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology is widely used in wireless broadband communication ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
CPCH04L25/022H04L25/0232H04L25/03159
Inventor 张赟
Owner OMNIVISION TECH (SHANGHAI) CO LTD
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