of wireless communications and networks, and the associated technologies. in PDF (Adobe Acrobat) format, PowerPoint slides, and sign-up. Department of Electrical and Computer Engineering. Michigan State University. Introduction to Wireless. Communications and Networks. Tongtong Li. Dept. Wireless Networks Spring Outline of the course: Basic topics. Transmission Fundamentals o Analog and digital transmission o Channel capacity.
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1 Overview of Wireless Communications. 1. HistoryofWirelessCommunications. 15 Cellular Systems and Infrastructure- Based Wireless Networks. PDF | Next-generation wireless (NextG) involves the concept that the next spectrum allocation, and utilization, in radio communications, networks, and. PDF | The ability to communicate with people on move has evolved remarkably specially in the domain of wireless technology. The mobile.
Duarte, Guy Pujolle.
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Performances of geographical routing protocols combined with a position estimation process in wireless heterogenous networks. Daniel de O. Cunha, Otto Carlos M. Delicato, Luci Pirmez, Paulo F.
Miguel Elias M.
Campista, Igor M. Costa et al. Roberto G.
Aldunate, Gregg E. Larson, Miguel Nussbaum, Sergio F. Ochoa, Oriel A. Evaluation and Improvement of Multicast Service in Mobiles report back upon receiving the request. If the mobile has roaming authorization for billing purpose, the MSC registers the subscriber as a roamer. System capacity is low. First deployed in The first AMPS system used large cells and omni-directional base station antennas, therefore, the number of users that can be supported was quite limited.
AMPS is used all over the world and is esp. Can provide advanced call capabilities and at least a 3- times increase in overall system capacity. Was designed before the widespread of the Internet, mainly supported voice-centric services and limited date-service, like short messages, FAX,etc.
Support It shares the same frequencies, frequency reuse plan and base stations as AMPS. Provides access to VPN, supports short messages. CDPD Cellular Digital Packet Data , a data service for 1st and 2nd generation US cellular systems without additional bandwidth requirement, packet channels are dynamically assigned to idle voice channels.
Multiple-megabit internet services, and simultaneous voice and data access with multiple parties at the same time using a single mobile handset. Date rate: around 2Mbps.
Bandwidth: in the order of MHz Seamless global roaming: wireless access from anywhere on the earth. Obviously, it will include the satellite networks. Solution: Modulate each signal components onto a different subcarrier and send them over the channel in parallel, so that each component will experience flat fading.
System capacity and user mobility Enlarged capacity and higher transmission rate requires more efficient deployment of the available bandwidth, which implies that the system needs to be reused more often. Higher degree of frequency reuse implies more complex mobile management. How to increase spectrum efficiency is the ultimate goal of communication research.
Can support 2Mbps data rate. New RF equipment needed. No additional RF equipment needed, changes are all made in software or baseband hardware. Relies on the existing GSM infrastructure and allows 3G data access by adding high data rate equipment smart antennas at each GSM station. Support up to kbps of packet data.
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Provide high speed, high performance wireless connections between computers and the wireless access points, between laptops, between laptops and printers, scanners, video cameras and other electronics in local area or at home. Use spread spectrum and OFDM technologies Bluetooth: provides convenient and flexible low power short range wireless connections in personal area networks. First a manufacture, then extended to an open standard.
That is, base station is the fixed infrastructure which performs centralized administration.
Ad-Hoc networks are infrastructureless and have no fixed routers. Each node mobile in the ad-hoc network can set up as and play the role of a base station in that it can transmit to and receive from other nodes in the network. A node in an ad-hoc network to other nodes if they are within line-of-sight. Non-line-of-sight-nodes are called hidden nodes.
For single-frequency networks, it is simple and effective, rendering the jammed node unable to communicate or coordinate with others in the network. A jamming attack consists of interfering with the physical channel by putting up carriers on the frequencies used by nodes to communicate.
Since it requires a lot of energy, attackers usually attack in sporadic bursts. Since underwater acoustic frequency bands are narrow from a few to hundreds of kilohertz , UWCNs are vulnerable to narrowband jamming. Localization is affected by the replay attack when the attacker jams the communication between a sender and a receiver, and later replays the same message with stale information an incorrect reference posing as the sender.
In frequency hopping, a device transmits a signal on a frequency for a short period of time, changes to a different frequency and repeats. The transmitter and receiver must be coordinated. Direct-sequence spreads the signal over a wide band, using a pseudo-random bit stream.
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A receiver must know the spreading code to distinguish the signal from noise. Frequency-hopping schemes are somewhat resistant to interference from an attacker who does not know the hopping sequence. However, the attacker may be able to jam a wide band of the spectrum, or even follow the hopping sequence by scanning for the next transmission and quickly tuning the transmitter. References 1.
Wang, J.Four properties differentiate broadcast radio from, e. WLANs and 3G cellular systems are used to provide fast Internet access, with speeds that range from 0.
Spectrum allowing multiple operators: For a PDP in the form of Eq. In this case, the channel may be assumed to be static over one or several reciprocal bandwidth intervals.
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