Peng Shao, A. Matsumoto, S. Aust, Tetsuya Ito, P. Davis
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引用次数: 6
摘要
CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance)访问控制协议用于无线局域网(WLAN)中抑制干扰。根据CSMA/CA,如果发送方在发送后没有收到接收方的确认(ACK)控制帧,它将假定之前的传输失败并重复传输。为了对传输信道进行评价和优化传输参数以提高数据传输效率,必须区分传输失败的原因——传输信道中的碰撞或衰减。针对IEEE 802.11无线局域网提出了一些增强的碰撞检测方法。在这些方案中,检测信息的交换是必要的,这可能导致额外的碰撞。因此,由于碰撞,检测信息本身可能无法正确接收。本文提出了一种基于信号功率感知和时域信号处理的无线局域网发射站碰撞检测方法,该方法不需要接收端反馈信息。通过对碰撞频率的计算,可以调整传输参数,提高数据传输效率。实验验证了所提出的碰撞检测方法的有效性。
A collision detection method based on power sensing and time-domain signal processing for wireless LAN
Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) access control protocol is used in the wireless LAN (WLAN) to suppress interferences. According to the CSMA/CA, if the transmitter does not receive an acknowledgment (ACK) control frame from the receiver after transmission, it will assume the previous transmission has failed and repeat the transmission. In order to evaluate the transmission channel and optimize the transmission parameters for improving the efficiency of data transmission it is necessary to distinguish the reason for transmission failure — collisions or attenuation in the transmission channel. Some enhanced collision detection methods for IEEE 802.11 WLAN have been proposed. In these schemes, the exchange of detection information is necessary, which could lead to additional collisions. So the detection information itself might not be received correctly due to collisions. In this paper, we propose a novel collision detection method, based on signal power sensing and time-domain signal processing, for transmitting stations in WLAN, which does not require the feedback of information from the receiver. With the calculation of collision frequency, the transmission parameters can be adjusted to improve the efficiency of data transmission. The effectiveness of the proposed collision detection method is verified in an experiment.