Wireless LAN and many other wireless communication systems have applied OFDM to mitigate multipath. Considering that the requirement of random access may reduce performance due to contentions, in this paper we show that OFDM techniques can assist random access contention resolution. A method is proposed with both OFDMbased physical layer signal processing and MAC layer packet scheduling. It is ...

Recently, spiral inductors have widely been used instead of resistors in the design of matching circuits to enhance the thermal noise performance of a wireless transceiver. However, such elements usually have low quality factor (Q) and may encounter the self-resonance in microwave-frequency band which permits its use in higher frequencies, and on the other hand, they occupy the large on-chip sp...

In future wireless networks, different traffic classes will exhibit a large variety of characteristics and QoS requirements, such as transmission rate, maximum tolerable bit error rate and timeout specifications. However, currently there is no standard way of guaranteeing QoS in wireless access networks like Wireless LAN based on IEEE 802.11. In this paper, we propose medium access control prot...

In this article we analyze IPv6 handover over wireless LAN. Mobile IPv6 is designed to manage mobile nodes’ movements between wireless IPv6 networks. Nevertheless, the active communications of a mobile node are interrupted until the handover completes. Therefore, several extensions to Mobile IPv6 have been proposed to reduce the handover latency and the number of lost packets. We describe two o...

This study aims to identify the advantages and disadvantages of several mechanisms for service differentiation in mobile terminals of a wireless LAN to establish a better and more efficient network. According to the analysis of available approaches for the quality of service of the IEEE 802.11 standard, the objective of this paper is to suggest a new method named DF-DCF "Differentiated Frame DC...

51 In recent years, increasing attention has been paid to the IEEE 802.16 family of wireless local and metropolitan area network (LAN/MAN) standards and its potential to change the field of telecommunications operations and business models. Along with the WiMAX Forum extensions that define an end-to-end architecture, this wireless LAN/MAN technology emerges as a potent proposal for building nex...

IEEE 802.11a is a new high-speed physical layer (PHY) defined for the 5 GHz U-NII bands as a supplement to the existing IEEE 802.11 wireless LAN (WLAN) standard. In this paper, we give an overview of the IEEE 802.11a Orthogonal Frequency Domain Multiplexing (OFDM) PHY with eight different PHY rates as well as the distributed coordination function (DCF) of the IEEE 802.11 MAC, then derive the go...

This contribution proposes a set of requirements for the Radio Access Layer of a Wireless ATM system. It is in response to the request for requirements made in [1]. These requirements are based on experience gained from a prototype wireless ATM LAN system.