Yoshitaka Ohta

Development of audio and video synchronous transmission system based on IEEE802.11a

With digital AV equipment and wireless indoor networks becoming widespread, the demand to transmit AV streams through wireless channels has increased rapidly. An MPEG2-transport stream (MPEG2-TS) packet, the standard data format for broadcasting applications, must be transmitted on a low jitter channel. At present, IEEE802.11 has spread widely as the wireless transmission technology for home PC networks, but it is an asynchronous transmission system based on carrier sense multiple access with collision avoidance (CSMA/CA) and automatic repeat request (ARQ) for lost packets. So when a MPEG2-TS packet is transmitted over the wireless channel, the jitter of the packet exceeds the acceptable jitter level of the MPEG2-TS decoder, as defined by the MPEG2-TS standards (ISO/IEC IS 13818-1, 1994; ISO/IEC IS 13818-9, 1996). We propose a method for transmitting a high quality AV stream on an IEEE802.11a (ISO/IEC8802-11 ANSI/IEEE Std 802.11, 1999; IEEE Std 802.11a, 1999) network.