By Vincent K.N. Lau Yu-Kwong Ricky Kwok
Realizing the cornerstone of an effective communications networkMobility is defining the way forward for computing, and in a resource-limited instant setting, interoperability and function current an immense problem that has baffled researchers and engineers for years. Now, instant net and cellular Computing is the 1st e-book to take on this factor with an intensive exam of the way those exact applied sciences can interact, via numerous model tools, to keep up an efficient communications community. The authors' "bottom up" technique cuts via all protocol stacks in a conversation approach to explain how software wishes impact the underlying actual layer and community layer designs, and explains how a few of the units in a wide networking method can converse with every one other.Divided into six components, the e-book explores: * necessities of instant Communications * mobile instant applied sciences * Short-Range instant applied sciences * Protocol variations for instant Networking * instant assets administration * cellular Computing software concerns during the e-book, sensible, real-life case reviews function motivating examples that will help you achieve an in-depth figuring out of the applied sciences being mentioned. no matter if you are a scholar, researcher, or practitioner within the box, this can be the one publication that covers the scope and intensity of this primary subject.
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Extra resources for Wireless Internet and Mobile Computing: Interoperability and Performance
Xxix This Page Intentionally Left Blank ACRONYMS ACK ACL AFH AOA AODV ARQ AVSG AWGN BPSK CCK CDMA CRC CSMNCA CSMNCD Acknowledgment Asynchronous Connectionless Link Adaptive Frequency Hopping Angle of Arrival Ad Hoc On-Demand Distance Vector Automatic Repeat Request Accessible Volume Storage Group Additive White Gaussian Noise Binary Phase-Shift Keying Complementary Code Keying Code-Division Multiple Access Cyclic Redundancy Check Carrier-Sense Multiple Access with Collision Avoidance Carrier-Sense Multiple Access with Collision Detection xxxi xxxii ACRONYMS CTS D-CDMA DCF DHT DMT DSDV DSL DSR DSSS FDMA FHSS GGSN GMSK GPRS GPS GSM HLR IFS IMSI IS1 ISM IV L2CAP LMP LMU MAC MDMS MSC NAP NAT OBEX OFDM Clear to Send Deterministic CDMA Distribution Coordination Function Distributed Hash Table Discrete Multitone Destination-Sequenced Distance-Vector Digital Subscriber Line Dynamic Source Routing Direct Sequence Spread Spectrum Frequency-Division Multiple Access Frequency-Hopping Spread Spectrum Gateway GPRS Support Node Gaussian Minimum Shift Keying General Packet Radio Service Global Positioning System Global System for Mobile Communications Home Location Register Interframe Space International Mobile Subscriber Identity Intersymbol Interference Industrial, Scientific, Medical Initialization Vector Logical Link Control and Adaptation Protocol Link Manager Protocol Location Measurement Unit Multiple Access Control Master Delay MAC Scheduling Mobile Switching Center Network Access Point Network Address Translation Object Exchange Orthogonal Frequency-Division Multiplexing ACRONYMS Open Mobile Alliance Orthogonal Variable Spreading Factor Peer-to-Peer Point Coordination Function Personal Communication System Pulse Position Modulation Point-to-Point Protocol Pilot Strength Measurement Message Public Switched Telephone Network Peak Signal-to-Noise Ratio Quadrature Amplitude Modulation QAM Quality of Service QOS Quadrature Phase-Shift Keying QPSK R-CDMA Random CDMA Radio Link Protocol RLP Route Reply RREP Route Request RREQ Received Signal Strength Indication RSSI Request to Send RTS Selective ACK SACK Synchronous Connection-Oriented sco Space-Division Multiple Access SDMA Service Discovery Protocol SDP Serving GPRS Support Node SGSN Subscriber Identification Module SIM Serving Mobile Location Center SMLC Signed Response SRES Transport Control Protocol TCP TKIP Temporal Key Integrity Protocol Transport Layer Security TLS TMSI Temporary Mobile Subscriber Identity Time Difference of Arrival TODA OMA OVSF P2P PCF PCS PPM PPP PSMM PSTN PSNR xxxiii xxxiv UDP VLR WAE WAP WDP WEP WLAN WML WPA WSP WTA WTAI WTLS WTP XML ACRONYMS User Datagram Protocol Visitor Location Register Wireless Application Environment Wireless Application Protocol Wireless Datagram Protocol Wired Equivalent Privacy Wireless Local Area Network Wireless Markup Language Wi-Fi Protected Access Wireless Session Protocol Wireless Telephony Application Wireless Telephony Application Interface Wireless Transport Layer Security Wireless Transaction Protocol Extensible Markup Language PART I ESSENTIALS OF WIRELESS COMMUNI CATIONS This Page Intentionally Left Blank CHAPTER 1 THE MOBILE RADIO PROPAGATION CHANNEL The beaten path is the safest.
Otherwise, the signal experiences frequency selective fading channels. Similarly, when T, > T,, the signal experiences fast fading channels. Otherwise, the signal experiences slow fading channels. 9 summarizes the concept of frequency flat fading, frequency selective fading, fast fading and slow fading channels. 1 A wideband signal is more difficult to transmit than a narrowband signal because of the inter-symbol interference problem faced by the wideband signal. 2 In flat fading channels, there is no multipath effect at all as there is only a single resolvable echo at the receiver.
6(a), a narrow pulse (in time) at the transmitter results in a spread of energy across the delay dimension. The graph of received power versus delay is called the powerdelay profile and is used to measure the delay spread experimentally. Typically, the delay spread in enclosed indoor environment is smaller than the outdoor environment because the range of delays in the multipaths are more contained in the indoor environment. On the other hand, to quantify the multipath dimension , an equivalent parameter, namely the coherence bandwidth, can be used.