The paper is concerned with transmission of MPEG video over a Bluetooth wireless network using fuzzy controllers. MPEG variable bit rate (VBR) data sources are unpredictable and have substantial variations in bit rate. Subsequently, it is almost impossible to transmit the VBR data sources over a Bluetooth channel with a limited transmission speed of up to 723.2 kb/s and wireless interference, without data loss or image quality degradation. To resolve this problem, a traffic-shaping buffer is introduced before the host controller interface (HCI). In Bluetooth, the traffic-shaping buffer prevents excessive back-to-back cells being generated during the peak transmissions of MPEG VBR data sources. We use a fuzzy controller to adjust the traffic-shaping buffer output rate to enable the VBR encoded video to conform to the current situation in the Bluetooth channel. Another fuzzy controller regulates the average arrival rate to the traffic-shaping buffer to prevent either overflow or starvation of the buffer. Computer simulation results demonstrate that the use of fuzzy controllers reduces excessive delay and data loss at the HCI as compared with conventional video transmission in Bluetooth.
展开▼
