18-01-2011, 12:56 PM
Abstract
Wireless technology has become the most exciting area in telecommunication and networking. The rapid growth of mobile telephone use, various satellite services, and now the wireless Internet are generating tremendous changes in telecommunications and networking. Wireless is convenient and often less expensive to deploy than fixed service, but wireless is not perfect. There are limitations, political and technical difficulties that may ultimately prevent wireless technologies from reaching their full potential. Regardless of the design of the transmission system, there will be errors, resulting in the change of one or more bits in a transmitted frame. In this thesis, we focus on different characteristics of wireless channels and their applications to video transmission framework. Channel coding and interleaving techniques have long been recognized as an effective technique for combating the deleterious effects of noise, interference, jamming, fading, and other channel impairments. The basic idea of channel coding is to introduce controlled redundancy into the transmitted signals that is exploited at the receiver to correct channel induced errors by means of forward error correction. Channel coding can also be used for error detection in schemes that employ automatic repeat request (ARQ) strategies. ARQ strategies must have a feedback channel to relay the retransmission requests from the receiver back to the transmitter when errors are detected. ARQ schemes require buffering at the transmitter and/or receiver and, therefore, are suitable for data applications but are not suitable for delay sensitive voice applications. Problem of video transmission over wireless channels has been addressed in literature. In this thesis, we will present a review of these techniques. However, we will mainly focus on different characteristics of wireless channels and their implications on video transmission framework. Therefore, before discussing specific tools in chapter 7, we first present the characteristics of wireless channels in chapter 5 and chapter 6. In chapter 8, we present the performance of the protocol, based on a network simulation. In chapter 9, we present conclusions and future work.
Wireless technology has become the most exciting area in telecommunication and networking. The rapid growth of mobile telephone use, various satellite services, and now the wireless Internet are generating tremendous changes in telecommunications and networking. Wireless is convenient and often less expensive to deploy than fixed service, but wireless is not perfect. There are limitations, political and technical difficulties that may ultimately prevent wireless technologies from reaching their full potential. Regardless of the design of the transmission system, there will be errors, resulting in the change of one or more bits in a transmitted frame. In this thesis, we focus on different characteristics of wireless channels and their applications to video transmission framework. Channel coding and interleaving techniques have long been recognized as an effective technique for combating the deleterious effects of noise, interference, jamming, fading, and other channel impairments. The basic idea of channel coding is to introduce controlled redundancy into the transmitted signals that is exploited at the receiver to correct channel induced errors by means of forward error correction. Channel coding can also be used for error detection in schemes that employ automatic repeat request (ARQ) strategies. ARQ strategies must have a feedback channel to relay the retransmission requests from the receiver back to the transmitter when errors are detected. ARQ schemes require buffering at the transmitter and/or receiver and, therefore, are suitable for data applications but are not suitable for delay sensitive voice applications. Problem of video transmission over wireless channels has been addressed in literature. In this thesis, we will present a review of these techniques. However, we will mainly focus on different characteristics of wireless channels and their implications on video transmission framework. Therefore, before discussing specific tools in chapter 7, we first present the characteristics of wireless channels in chapter 5 and chapter 6. In chapter 8, we present the performance of the protocol, based on a network simulation. In chapter 9, we present conclusions and future work.