Method and system for transmitting and receiving data signal of site/access point in wireless local area network

Abstract

The invention discloses a method and a system for transmitting and receiving a data signal of a site / an access point in a wireless local area network, which can maintain the high throughput of a communication link in the wireless local area network in the situation that the dynamic range of the power of a radio signal is wide. The main scheme comprises the following steps: A, presetting a plurality of gains, which can ensure a receiver to work stably, for a digital AGC loop; B, selecting a corresponding preset gain and performing fine-tuning on the corresponding preset gain when necessary according to the intensity of the data signal received by the site / the access point currently; and C, setting the transmission power of a transmitter and performing the fine-tuning on the transmission power when necessary according to the intensity of the data signal received by the site / the access point currently. According to the method, a special MAC frame is added to verify the data transmitting and receiving performance, and a special method is adopted to estimate the intensity of the data signal transmitted by a channel and to calculate the data receiving ratio of the site / the access point which can serve as quantitative data for judging the fading of the channel of a wireless link, and a reference frame of the communication efficiency of a device.

Description

technical field [0001] The invention belongs to the technical field of radio transmission, and in particular relates to a method for transmitting and receiving data of a wireless terminal station (Station, STA) / wireless access point (Access Point, AP) in a wireless local area network (WirelessLocalAreaNetwork, referred to as WLAN) based on the IEEE802.11 standard and system. Background technique [0002] Wireless local area network is the product of the combination of computer network and wireless communication technology in the 1990s. It is a computer local area network based on wired network and uses wireless channel as the transmission medium. Connectivity issues provide potential means for communication mobility, personalization and multimedia applications, and become one of the effective ways of broadband wireless access. [0003] In June 1997, the Institute of Electrical and Electronics Engineers (IEEE) passed the IEEE802.11 WLAN standard, which is also the first inte...

AI Technical Summary

Problems solved by technology

For a signal with too large amplitude after adjustment, its amplitude may still be larger than the normal range, and the receiving end may generate overflow errors and energy estimation deviations; for signals with too small amplitude, AGC may adjust the useless signal to the usable range, and the receiving end will produce Wrong energy estimation, which will make the threshold comparison error and further lead to VGA imbalance, thus forming a cycle of energy estimation errors, seriously affecting system stability and normal performance

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