Overview of wireless personal communications

Padgett, J.E.; Günther, Christoph; Hattori, Takeshi

doi:10.1109/35.339877

Cited by 239 publications

(68 citation statements)

References 16 publications

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“…The web with hexagonal cells and three levels of BS hierarchy are considered in work [2,3] . There are various hierarchal in which BS are distributed such as: BS of macro zone, central BS (CBS), main BS of a radio network.…”

Section: Analysis Of the Network Models Of Bsmentioning

confidence: 99%

Comparative Study between Various Topological Models of Base Stations in Cellular Mobile Radio Communication

Al-Hunaity¹

2006

American J. of Applied Sciences

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Abstract:In this paper, we analyze the different parameters of quality for the network models of base stations (BS) when the service messages have not a delay. Also, we compare between four topologies star, ring, radial ring and fully connected using identical quality of user service and conditional cost of one Erlang. Our results have been obtained for different probabilities of failure in service message on one branch and fixed number of web channels. The obtained results show that radial ring topology outperform better than the others with respect to both cost and hierarchy.

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Section: Analysis Of the Network Models Of Bsmentioning

confidence: 99%

Comparative Study between Various Topological Models of Base Stations in Cellular Mobile Radio Communication

Al-Hunaity¹

2006

American J. of Applied Sciences

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“…In Figure 4, we construct a log-log plot of Equation (2-3)'s lower bound on E[T image ] as a function of the image fragmentation factor F. We substitute the following values: a raw BER of 10 -2 for wireless fades [18][19], header size H = 100 bits, wireless BW = 500 kbit/s (in the middle range of wireless transmission rates [20]), and image size I = 20000 bits (about the size of many small compressed images).…”

Section: Latency Over Noisy Wireless Bottlenecks: a Minimum-delay Boundmentioning

confidence: 99%

A progressively reliable transport protocol for interactive wireless multimedia

Han

Messerschmitt

1999

Multimedia Systems

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Abstract:We propose a progressively reliable transport protocol for delivery of delay-sensitive multimedia over Internet connections with wireless access links. The protocol, termed "Leaky" ARQ, initially permits corrupt packets to be leaked to the receiving application and then uses retransmissions to progressively refine the quality of subsequent packet versions. A Web server would employ Leaky ARQ to quickly deliver a possibly corrupt first version of an image over a noisy bandlimited wireless link for immediate display by a Web browser. Later, Leaky ARQ's retransmissions would enable the browser to eventually display a cleaner image. Forwarding and displaying corrupt error-tolerant image data: (1) lowers the perceptual delay compared to fully reliable packet delivery, and (2) can be shown to produce images with lower distortion than aggressively compressed images when the delay budget only permits weak forward error correction. Leaky ARQ supports delaying of re-transmissions so that initial packet transmissions can be expedited, and cancelling of retransmissions associated with "out-of-date" data. Leaky ARQ can be parameterized to partially retransmit audio and video. We propose to implement Leaky ARQ by modifying Type-II Hybrid/"code combining" ARQ.

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“…Although second-generation (2G) wireless systems, such as the global system for mobile communications (GSM) and IS-95 are successful in many countries [1], they still cannot meet the requirement of high-speed data and user capacity in high-user-density areas. Higher system capacity, better quality of service (QoS), and flexible accommodations of various wide-band services (such as video and multimedia services) with different transmission rates are required in third-generation (3G) wireless communication systems [2].…”

Section: Introductionmentioning

confidence: 99%

Reverse-Link Capacity of Power-Controlled CDMA Systems With Beamforming

Yao

Zhang

2004

IEEE Trans. Veh. Technol.

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Abstract-In this paper, reverse-link capacity, in terms of user capacity and Erlang capacity, of a direct-sequence code-division multiple-access (DS-CDMA) system with the use of beamforming is investigated. Signal-to-interference ratio (SIR)-based power control is assumed and both transmit and receive beamforming are considered. Instead of using tedious iterative methods to evaluate user capacity, a simple closed-form capacity expression with respect to antenna gains, a target SIR, and the CDMA processing gain is derived. Numerical results indicate significant capacity improvement with beamforming. The impact of the estimation errors of arrival angles on the capacity is examined. The joint use of a RAKE receiver and beamforming is investigated and the capacity expression for CDMA systems with multiclass services is also derived.Index Terms-Beamforming, code-division multiple access (CDMA), Erlang capacity, power control, RAKE receiver, user capacity.

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Overview of wireless personal communications

Cited by 239 publications

References 16 publications

Comparative Study between Various Topological Models of Base Stations in Cellular Mobile Radio Communication

Comparative Study between Various Topological Models of Base Stations in Cellular Mobile Radio Communication

A progressively reliable transport protocol for interactive wireless multimedia

Reverse-Link Capacity of Power-Controlled CDMA Systems With Beamforming

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