Universal Digital Portable Communications: A System Perspective

Cox, D.C.; Arnold, H. W.; Porter, P.T.

doi:10.1109/jsac.1987.1146603

Cited by 143 publications

(14 citation statements)

References 16 publications

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“…The transmitted PAM signal can be expressed as (6) where is UWB waveform and 1 , 0 1 , 1 When the pulse is transmitted, due to derivative characteristics of the antenna, the output of the transmitter can be modeled by first derivative of the pulse [9] lim (7) and PSD of deterministic power signal is means that while bit 0 is represented by a pulse originating at the time instant 0, bit 1 is shifted in time by the amount of from 0. The PPM signal can be represented as (10) where is represented by (2). The value of is chosen according to the autocorrelation characteristics of the pulse.…”

Section: Uwb Signals and Modulation Techniqesmentioning

confidence: 99%

“…For more number of user detection, certainly one has to go for radio communication whose technique would certainly require the knowledge of the spatial and temporal statistics of the signal attenuation, the multipath delay spread, and even the impulse response of the indoor radio channel. The performance of communications systems using portable radiotelephones [l], [2] will strongly depend on the attenuation characteristics of radio signals propagating into and within buildings. Scattering due to the presence of objects like wooden and steel furniture and other disturbances in the propagation medium can produce rapid signal level fluctuations from small movements of transmitter receiver or motion of the people in room [3].…”

Section: Introductionmentioning

confidence: 99%

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Simulation and Analysis of UWB Indoor Channel Through S-V Model for User Location Detection

Jadhavar¹,

Sontakke²

2011

IJCEE

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Section: Uwb Signals and Modulation Techniqesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation and Analysis of UWB Indoor Channel Through S-V Model for User Location Detection

Jadhavar¹,

Sontakke²

2011

IJCEE

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“…The cordless base-unit transceiver usually serves one or, at most, two handsets at the end of one wireline loop. Now consider moving such a base unit back along the copper-wire-pair loop end a distance that can be reliably covered by a low-power wireless link [10,11], i.e., several hundred to a thousand feet 6 or so, and mounting it on a utility pole or a street light pole. This replaces the copper loop end with the wireless link.…”

Section: Loop Evolution and Economicsmentioning

confidence: 99%

“…In addition to the economic benefits of wireless loop access, the further highly desirable wireless-access communications features of both small-scale and largescale mobility [20] can be provided to the wireless loop subscribers by integrating the wireless loop access with intelligence in the infrastructure network [1, 2,7,[9][10][11][12][13][14][15][16][17][18]20]. This added mobility feature results in some additional complexity in network-control intelligence, but this complexity is in computer-like technology at centralized locations, and the cost of this technology is rapidly decreasing with the decreasing cost of very large scale integrated circuits (VLSI).…”

Section: Loop Evolution and Economicsmentioning

confidence: 99%

“…2 b. The use of specially designed point-to-multipoint radio technology to provide fixed telephone service to rural subscribers in sparsely populated regions [4] and to subscribers in urban and suburban areas c. The use of specially designed wideband pointto-multipoint microwave and millimeter-wave technology ("wireless cable") to distribute television and video services to fixed subscribers [5] d. The use of specially designed digital cordless telephones to provide wireless PBX and wireless CENTREX services to large businesses [6][7][8] e. Variations on the original proposal [1, 2] to use low-power digital radio for the last 1000 ft or so of a telephone or data loop [7,[9][10][11][12][13][14][15][16][17] After reviewing a "telephone" loop, we briefly discuss the first four wireless loop applications noted above, and then finish with a discussion of application (e) and its relationship to personal communications systems (PCS), both low-tier and high-tier [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Wireless loops: What are they?

Cox

1996

Int J Wireless Inf Networks

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Several loop applications of wireless technology are aimed at reducing the cost of deploying communications services ranging from telephone to wideband video. In these applications, wireless links replace a portion of a wireline loop from a central location (a central office or cable headend) to a subscriber. The replacement of labor-intensive wireline technology by complex mass-produced integrated electronics in wireless transceivers is projected to reduce the overall cost of the resulting loop. These wireless loop applications attempt to provide existing communications services or small modifications to existing communications services. A different interpretation of a wireless loop makes use of low-power digital radio technology to provide the last thousand feet or so of a loop. Low-power low-complexity wireless loop technology in small base units can be integrated with network intelligence to provide the fixed-infrastructure network needed to support economical personal communications services (PCS) to small, lightweight, low-power personal voice and/or data communicators. Low-complexity communicators can provide many hours of "talk time" or data transmission time and perhaps several days of standby time from small batteries (< 1.5 oz). Because this application of wireless loop technology can reduce the inherent costs in several parts of a wireline loop, it has the potential to provide convenient widespread PCS at less costs than providing telephone services over conventional wireline loops. This low-power wireless loop application does not fit into any existing communications system paradigm. Wireless technology with tetherless access and wide-ranging mobility, e.g., the personal access communications system (PACS), does not fit the accumulated wisdom of the wireline telephony paradigm. It also does not fit the paradigm of existing cellular radio that has sparsely distributed expensive cell sites, and it is not targeted at fixed video services as is wireless cable. Because a significant change in thinking is required in addressing this new low-power low-complexity widespread wireless loop paradigm, its large economic advantages and service benefits have not yet been embraced by many of the existing communications providers, who appear to be more comfortable pursuing the better-known paradigms of video using wireless cable, or of cellular radio in the guise of high-tier PCS, or in the guise of rapid economical deployment of telephone services in developing nations. This paper discusses the inherent economic advantages and service benefits of low-power low-complexity wireless loop technology integrated with network intelligence aimed at providing economical low-tier PCS to everyone.

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Performance evaluation of uplink power control algorithm over TDMA systems

Wen

Lain

Shen

1998

Int. J. Commun. Syst.

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Future PCS (personal communication system) cellular networks will mainly be driven by high link quality, high bandwidth utilization, low power consumption and efficient network management. Power control is one of the several major techniques which could help to achieve these goals. By exploiting power control techniques, co-channel interference could be reduced and as many links as possible could be obtained with satisfactory link quality. SIR-based (signal-to-interference ratio-based) power control was proposed as a technique for managing co-channel interference in cellular radio systems. Furthermore, new distributed autonomous feedback power control methods were introduced to achieve excellent performance without the difficult centralized control used in SIR-based methods. Unfortunately, the implementation of those power control algorithms is still challenging owing to the precision of SIR. The main aim of this paper is to investigate an uplink power control algorithm which depends indirectly on the signal-to-noise ratio in the TDMA (time division multiple access) cellular system. Simulation of the prototype hardware implementation of the receiver baseband signal processing based on the PACS (personal access communications system) specification is used as the main approach to explore the performance evaluation of this power control technique. According to simulation results, suitable values of those parameters used in this power control algorithm are derived, and the minimum frequency reuse factor under different propagation environments is also obtained for PACS under power control.

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Universal Digital Portable Communications: A System Perspective

Cited by 143 publications

References 16 publications

Simulation and Analysis of UWB Indoor Channel Through S-V Model for User Location Detection

Simulation and Analysis of UWB Indoor Channel Through S-V Model for User Location Detection

Wireless loops: What are they?

Performance evaluation of uplink power control algorithm over TDMA systems

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