Method and device for transmitting data

Abstract

The invention discloses a method and a device for transmitting data, which are applied to wireless local area networks adopting a plurality of antennas. The method comprises the following steps of: keeping the current antenna assembly unchanged after successfully transmitting a first message to an opposite end; improving transmission velocity to transmit the next message until the maximum velocity of successfully transmitting the message under the condition of the current antenna assembly is reached, and transmitting the rest messages at the maximum velocity; keeping the current transmission velocity unchanged if the first message is not successfully transmitted, and switching to other antenna assembly to transmit the next message; improving the transmission velocity to transmit the next message if the message is successfully transmitted until the maximum velocity of successfully transmitting the message under the condition of the current antenna assembly is reached; and reducing the transmission velocity to transmit the next message if the message is not successfully transmitted until the message is successfully transmitted, and transmitting the rest message at the detected transmission velocity. The method and the device can improve transmitting parameter selection efficiency and real-time, and system throughput.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a data transmission method and a device thereof. Background technique [0002] With the continuous development of wireless communication, the 802.11 protocol family added 802.11n a few years ago. 802.11n has greatly improved the physical rate. It supports up to 4 streams and uses 40MHz bandwidth up to 600Mbps. It is 802.11a or 802.11 As much as ten times the highest speed of g. An important feature of 802.11n is the introduction of MIMO (Multiple Input Multiple Output) technology, that is, an 802.11n radio frequency module can send multiple signals at the same time, and can also receive multiple signals at the same time, through spatial multiplexing technology Improved channel utilization. Correspondingly, a radio needs to be connected to multiple antennas, and due to the characteristics of MIMO technology, multipath phenomena can be used to improve signal quality. 802.11n...

AI Technical Summary

Problems solved by technology

[0006] (1) Poor real-time performance

[0007] If the wireless environment changes during the detection cycle, the antenna system cannot respond in real time, and the optimal antenna can only be updated when the next detection time arrives. The longer the detection cycle, the worse the real-time performance;

[0008] (2) Poor accuracy

[0009] In the process of antenna scanning, for the sake of fairness, the same rate needs to be used. However, due to the characteristics of WLAN networks, the rate selection has a great impact on the transmission success rate, and the accuracy is not high. For example, if the rate is selected high, it may lead to using The performance of each group of antennas is poor when transmitting data

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