Dhinaharan Nagamalai et al. (Eds) : CSE, DBDM, CCNET, AIFL, SCOM, CICS, CSIP- 2014 pp. 251–259, 2014. © CS & IT-CSCP 2014 DOI : 10.5121/csit.2014.4422              Ghadeer Hassan Mustafa 1 , Mohamed Essam Khedr 2 and Ramy Eltarras 3 1,2 Electronics and Communication Engineering Department Arab Academy for Science and Technology Alexandria, Egypt ghadeerhassan2009@gmail.com khedr@aast.edu 3 Computer Science Department Arab Academy for Science and Technology Alexandria, Egypt ramy@aast.edu ABSTRACT Packet Collisions in wireless communication are one of the most causes of network performance degradation. MACAW mechanism is a popular and widely used mechanism to reduce packet collisions that arise due to the hidden terminal problem in mobile ad-hoc networks. However; Mobility is considered a vital issue in mobile ad-hoc networks that has not been thoroughly investigated. A real time simulation is carried out to measure the Throughput and the Packet Delivery Ratio of an ad-hoc network under Shadowing propagation model using MACAW mechanism with different mobility scenarios. KEYWORDS Mobile Ad-hoc network, MACAW mechansim, IEEE 802.11b, Shadowing 1. INTRODUCTION Wireless Communication has impacted our daily lives and has become significant for our modern existence. Drastic changes have taken place since the early development of radio telephony to current smart devices such as tablets, iPhones that support communication with higher data rate, coping with the increasing demand for mobility and flexibility in nowadays lifestyle. In addition to wireless multimedia that is becoming increasingly popular as they offer users the accessibility to information and multimedia services anytime. As wireless communication continues to evolve, the future holds many more possibilities in this field. IEEE 802.11 is considered to be an important standard for Wireless Local Area Networks (WLANs) which is adopted by many manufacturers of WLAN products. IEEE 802.11 is concerned with the physical layer and the MAC layer. The physical layer is in charge of transmitting the raw data over Radio Frequency (RF) .Whereas, the MAC layer coordinates access