We propose a reliable multicast MAC protocol based on the multicarrier direct-sequence code-division multiple access (MC DS-CDMA) scheme to enhance spatial reuse efficiency in wireless local area networks (WLANs). Conventional multicast MAC protocols using RTS-CTS handshake exchange CTS and ACK packets consecutively for reliable transmission. Although this protocol guarantees transmission relia...

صلاخلا ــ ة : مت ةقرولا هذه يف ءاشنإ يف هدعاسملل مدقتم ماظن بناوج ذيفنتو ميمصت ضرع قتو و مي ءادأ حيحصت تارفش لأا ءاطخ ةليلق لا ةناتم ، ةينبم ىلع ءوفاكتلا رايتخا . موقي امه نيتيسيئر نيتفيظوب ةساردلا هذه يف مدقتملا ماظنلا : 1 ادأ باسحل ةيزاوتملا هاآاحملا ء تارفش حيحصت لأا ءاطخ ةليلق نمزب ةفاثكلا ادج ريصق ةنراقم ةمظنأب ةاآاحملا ةدوجوملا . 2 ةليلق ءاطخلأا حيحصت تارفشو فعضلا قطانم صحف نع ة...

With the emergence of multi-carrier (MC) orthogonal frequency division multiplexing (OFDM) scheme in the current WLAN standards and next generation wireless broadband standards, the necessitation to acquire a method for combating high peak to average power ratio (PMEPR) becomes imminent. In this thesis, we will explore various sequences to determine their PMEPR behaviours, in hopes to find some...

The telecommunications industry has witnessed an ever accelerated growth of the usage of mobile communications. The first generation (1G) was voice-centric and used analog signaling, while real revolution began with the birth of second-generation (2G) technologies in which the systems are digital with 10 kbps data transfer rate. Later on 2G was enhanced to 2.5G which provided Global Packet Radi...

IEEE 802.16e mobile WiMAX is currently being developed as the next-generation communication standard competing with wireless local area network (WLAN), code division multiple access (CDMA), evolution data optimized (EVDO), enhanced data rates for GSM evolution (EDGE) and high speed downlink packet access (HSDPA), even though early applications for mobile WiMAX technology will be limited to high...

Due to integration of heterogeneous wireless technology demand of seamless communication is increases. Various approaches have been proposed for network selection in vertical handoff. Here we propose a new energy efficient network selection algorithm by considering three networks (CDMA, WIMAX &WLAN) for network selection .In this work, based on the power consumption, traffic class and current b...

---------------------------------------------------------------------***----------------------------------------------------------------Abstract –Orthogonal Frequency Division Multiplexing (OFDM)is the promising candidate of a multiple carrier modulation technique because it does not require equalizers. OFDM is robust in adverse channel conditions and allows a high level of spectral efficiency....

In this paper the architectural design of a measurement system for remote sensing, based on ‘ad hoc’ Wireless Local Area Network (WLAN) concept is proposed. The system is conceived as a Code Division Multiple Access (CDMA) Spread Spectrum (SS) network operating in the unlicensed Industrial-Scientific-Medical (ISM) frequency band (2.4 GHz to 2.5 GHz). It makes use of a specific and extremely sim...

In this report, we proposed a DS-CDMA-based WLAN architecture which provides integrated services. Then we studied the channel characteristics for indoor wireless LAN's. Random amplitude, path delay and phase sequences of the channel response have been studied extensively here.For the distribution of the arrival time sequence, it is found that the modi ed Poisson model: K Model is better over th...

Abstract Alltop functions have applications to code-division multiple access (CDMA) systems and mutually unbiased bases (MUBs). construct MUBs CDMA signal sets, this motivates the continued search for further functions. The discovery of is hindered by computational complexity verification. This paper narrows space through introduction a characteristic cubic polynomial provides verification proc...