We give a brief survey of anti-multipath techniques and associated modulation (OFDM and single-carrier) formats, which are pertinent for 802.16.3 fixed broadband wireless systems. Careful modeling and evaluation of power amplifier nonlinearities and frequency offsets is important for evaluation of proposed PHY modulation formats. Because of the sensitivity of OFDM systems to these impairments, ...

Spatial modulation (SM) is a newly emerging multiple-input multiple-output (MIMO) technique which actives only one transmit antenna at any time instant and provides improved energy efficiency and error performance as compared with convention MIMO techniques. In this paper, we propose to integrate SM into the IEEE 802.11n standard in order to improve the bit error rate (BER) performance when the...

Two different relay modes are defined in IEEE 802.16j WIMAX standard: transparent mode and non-transparent mode. IEEE 802.16j standard supports mobile station mobility; it defines three kinds of hand over mechanism: hard handover, macro diversity handover (MDHO) and fast BS switching (FBSS) In this paper we have simulated the hard hand over mechanism of IEEE 802.16j transparent mode networks us...

In WLAN the medium access control ( M A C ) protocol is the main element for determining the efficiency in sharing the limited communication bandwidth of the wireless channel. This paper focuses on the efficiency of the IEEE 802.11 standard for wireless LANs. Specifically, we derive an analytical formula for the protocol capacity [Kur 841. From this analysis we found i ) the theoretical upper b...

Problem statement: Wireless ADHOC networks are self organized dynamic networks can share wireless channel without any established central control standard for IEEE 802.11. Approach: The most common protocols are AODV, DSDV, DSR in ADHOC used to ensure the data transmission among themselves. To meet the need of low power and low cost IEEE 802.15.4 standard was developed for sensor networks. Resu...

The focus of this article is to show how a caching mechanism can be applied to vehicular networks operating under the draft standard IEEE 802.11p to reduce the probe delay, and consequently, the handover delay in vehicle-to-infrastructure (V2I) communications. The authors have developed and tested an IEEE 802.11p model within the simulator NS-2 to evaluate the performance of vehicular applicati...

IEEE 802.11 wireless networks have gained great popularity. However, handoff is always a critical issue in this area. In this paper, we propose a novel seamless handoff mechanism for IEEE 802.11 wireless networks which support IEEE 802.11i security standard. Our approach consists of a Dynamic Tunnel Establishing procedure and a seamless handoff mechanism. Dynamic Tunnel Establishing is for each...

In WLAN the medium access control (MAC) protocol is the main element for determining the efficiency in sharing the limited communication bandwidth of the wireless channel. This paper focuses on the efficiency of the IEEE 802.11 standard for wireless LANs. Specifically, we derive an analytical formula for the protocol capacity [Kur 84]. From this analysis we found i) the theoretical upper bound ...

© 2015, IJCSMC All Rights Reserved 344 Abstract— Multicasting is the communication between single sender and multiple receivers. The legacy multicasting over the WLAN standard IEEE 802.11 has two problemspoor reliability and low transmission rates. Existing multicast protocols for 802.11 are not so efficient when they are used along with the frame aggregation of IEEE 802.11n WLANS. Therefore we...

Worldwide Interoperability for Microwave Access (WiMAX) is going to be an emerging wireless technology for the future. With the increasing popularity of Broadband internet, wireless networking market is thriving. Wireless network is not fully secure due to rapid release of new technologies, market competition and lack of physical infrastructure. In the IEEE 802.11 technolo...