Description
In recent years, rapid advances in multimedia and wireless communication technology have resulted in significant growth in the field of wireless multimedia communications. But it is still challenging to provide high quality multimedia (audio/video) content over error-prone wireless channels. Physical bandwidth is limited and is considered to be the most precious resource for a wireless carrier or service provider. High coding efficiency algorithms are required to meet the challenge of limited bandwidth of the wireless communication. The growing demand for high definition multimedia over wireless channels is further augmented by the exponential growth of mobile devices such as smart phone and tablets with high processing power. Also, the online high quality multimedia content is growing rapidly, the end-user demands accessibility from every device whether it is HDTV at home or a mobile device. In this work, a robust 'Unequal Error Protection' (UEP) technique is designed with available error protection schemes that protect the compressed audio data against channel errors along with 'Adaptive Modulation' technique to meet the bandwidth constraint. Forward Error Correction (FEC) codes add parity bits thus lowering the actual information bits, with net result of lower perceived audio quality or Quality of Service (QoS) at the fixed transmission bitrate with single or non-adaptive modulation. The adaptive modulation scheme along with suitable FEC codes is applied after classifying audio data into error sensitivity categories, to improve QoS, while satisfying the fixed channel bandwidth constraint.
