The Technology And Application Of IPTV STB Based On Wireless Transmission

Along with the development of the 3C fusion, the network has already turns from the concept to reality, and take numerical family as point of departure, head for numerical community, numerical city, is go to the numeral global village. The all new modern servicing business is turning with the characteristic of numeral, and will arouse the growth of the information industry. Be the important part of numerical family ,the IPTV STB also along with technological advance but continuously creative, the fast fierce development of the world correspondence and the information technology will cause the change of the whole television broadcast industry chain, the numerical television is the key link in this change. With along the broadcast television numeral which had already started in 2003, our country will stop simulate television to broadcast in 2015, carry out the numeral broadcast television wired, the satellite and wireless of the whole country overlay. Along with the overall numeral that accompanies with television broadcast turn, the traditional IPTV STB will promote gradually in the technique, the top of the function with perfect, become thus all new, huge numerical television industry.802.11n, the wireless network protocol is made by the Wi-Fi alliance at the back of the 802.11as/b/g, 802.11n can raise WLAN baud rate to 100 trillions above; Make use of the MIMO (Multiple-Input Multiple-Out-put) and the OFDM (Orthogonal Frequency Division Multiplexing) technique in the meantime, the 802.11n not only makes the baud rate to biggest, also raising the wireless deliver quality. This means the production that support the 802.11n standard can acquire the transformation ability of Ethernet networkAlong with the development of the numerical television technical and the quickly promotion of the wireless network baud rate, making it possible to carry out retransmission high and pure numerical signal with wireless network at numerical family, through 802.11n wireless network protocol to carry out the transmission of the multiple high and pure numerical signal become a deserve research of topic.This text passes the analysis and research of the numerical television technique principle and the principle of the 802.11n wireless network protocol, pass on the program on the media center of the numerical family to carry out the decoding and retransmission of the high and pure numerical television signal, at the STB program to carry out the receiving and playing the high and pure numerical television, basing the 802.11n protocol of the wireless network transmission system, carrying out the wireless transmission of high and pure and numerical television signal in the numerical family even the numerical community , carrying out the wireless transmission and play in multiple STB.The main contents of the thesis include the following several parts:1. First analyzing the principle of the numerical television technique,IPTV STB technique and 802.11n wireless network protocol. Then aiming at the function request of this project, put forward a design project of embedded Linux STB basing on the EM8623L hardware platform.2. Subsequently basing on the EM8623L hardware platform analyzed the bottom resource of the crossing edit chain and bottom equipment drivers, studied the system of the application program and the wireless network program, and discussed the way of the embedded Linux program base on this platform.3. Discussing the characteristic of the embedded Linux, after analyzed the system function of the application, designing the function module of the system, including the program of the receiving and retransmission of numerical television TS flow, the wireless network design, the design of receiving TS flow in the STB,complete design.4. End summary and outlook.Carried on summary to the work of this thesis, and prospect the work of aftertime.Through research about several aspects in the above, we implemented the wireless transmission of the TS flow of multiple high and pure and numerical signal, basing on the 802.11n network protocol, and founded a basis for further research on streaming media technology. We implemented the program of the media centre and STB.