تاخیر دسترسی به رسانه و تجزیه و تحلیل توان عملیاتی کدک های صوتی با سرکوب سکوت در شبکه های Ad Hoc بیسیم ☆

The rapid growth in internet has led to the emergence of different wireless technologies and simultaneously there has been a tough challenge to provide QoS over such wireless technologies.The demand for various real time multimedia application especially voice and video applications to be available on the internet has also increased. Multimedia applications need a lot more bandwidth and have different QoS requirements than the applications that were used in early years of the internet. The main reason for the poor quality of voice over IP is because we are transmitting the real time applications over the IP network which is mainly meant to transfer only data and not for voice transmission. The purpose of this paper is to check the performance of VOIP application under different CODEC's such as G.711, G.729 and G.723.1 over wireless network with and without silence suppression. Another issue addressed in this paper is the effect of increasing nodes on voice transmission for the different codecs. Parameters like media access delay and throughput are taken into consideration. Simulation is performed using OPNET modeler simulator.