Analysis of CDMA cellular radio systems employing adaptive antennas in multipath environments

Liberti, J.C.; Rappaport, Theodore S.

doi:10.1109/vetec.1996.501477

Cited by 18 publications

(19 citation statements)

References 10 publications

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“…4 counters previous data that stated no more than 5-10 links could be formed in a NLOS environment [5]. Rich multipath will allow future beam steering technologies to deduce algorithmically which azimuth angle would produce the greatest received power [12] [13]. Angular analysis and ray tracing of the measured PDPs allow reconstruction of the paths taken by the RF signals for each AOA.…”

Section: Ghz Urban Channel Propagation Analysismentioning

confidence: 70%

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28 GHz propagation measurements for outdoor cellular communications using steerable beam antennas in New York city

Azar

Wong

Wang

et al. 2013

2013 IEEE International Conference on Communications (ICC)

330

224

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The millimeter wave frequency spectrum offers unprecedented bandwidths for future broadband cellular networks. This paper presents the world's first empirical measurements for 28 GHz outdoor cellular propagation in New York City. Measurements were made in Manhattan for three different base station locations and 75 receiver locations over distances up to 500 meters. A 400 megachip-per-second channel sounder and directional horn antennas were used to measure propagation characteristics for future mm-wave cellular systems in urban environments. This paper presents measured path loss as a function of the transmitter -receiver separation distance, the angular distribution of received power using directional 24.5 dBi antennas, and power delay profiles observed in New York City. The measured data show that a large number of resolvable multipath components exist in both non line of sight and line of sight environments, with observed multipath excess delay spreads (20 dB) as great as 1388.4 ns and 753.5 ns, respectively. The widely diverse spatial channels observed at any particular location suggest that millimeter wave mobile communication systems with electrically steerable antennas could exploit resolvable multipath components to create viable links for cell sizes on the order of 200 m.

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Section: Ghz Urban Channel Propagation Analysismentioning

confidence: 70%

“…to decrease the path loss exponent [12] [13]. Considering, at each location, only the best angle orientation with the highest received power, the path loss exponent dropped to 4.58 for NLOS and 4.47 over all locations.…”

Section: Discussionmentioning

confidence: 99%

28 GHz propagation measurements for outdoor cellular communications using steerable beam antennas in New York city

Azar

Wong

Wang

et al. 2013

2013 IEEE International Conference on Communications (ICC)

330

224

View full text Add to dashboard Cite

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“…A fundamental relationship was established between the angular distribution of power in a multipath channel and the narrowband fading in a local region [7]. In addition, the performance of Code Division Multiple Access (CDMA) cellular radio systems in multipath environments was shown to improve dramatically with proper spatial filtering provided by adaptive antenna arrays and switched beam systems [8]. These and other results from the 1990s offer promise for future beamforming methodologies that may use narrowband pilot signals to rapidly find, lock on, and combine the best spatial paths using highly directional adaptive antennas [6].…”

Section: Introductionmentioning

confidence: 99%

28 GHz millimeter wave cellular communication measurements for reflection and penetration loss in and around buildings in New York city

Zhao

Mayzus

Sun

et al. 2013

2013 IEEE International Conference on Communications (ICC)

389

241

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In this paper, we present reflection coefficients and penetration losses for common building materials at 28 GHz for the design and deployment of future millimeter wave mobile communication networks. Reflections from walls and buildings and penetration losses were measured for indoor and outdoor materials, such as tinted glass, clear glass, brick, concrete, and drywall at 28 GHz in New York City. A 400 Mega-chip-persecond sliding correlator channel sounder and 24.5 dBi steerable horn antennas were used to emulate future mobile devices with adaptive antennas that will likely be used in future millimeter wave cellular systems [1]. Measurements in and around buildings show that outdoor building materials are excellent reflectors with the largest measured reflection coefficient of 0.896 for tinted glass as compared to indoor building materials that are less reflective. We also found that penetration loss is dependent not only on the number of obstructions and distance between transmitter and receiver, but also on the surrounding environment. The greatest penetration loss containing three interior walls of an office building was found to be 45.1 dB, with 11.39 m separation between the transmitter and receiver.

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“…In this paper, the uplink/downlink joint TOA/AOA pdf, marginal AOA pdf, and marginal TOA pdf at both the base station and mobile are derived for the hollow-disc and the elliptical scattering models . The pdfs for the elliptical model were previously derived in [3]. This paper is organized as follow.…”

Section: Introductionmentioning

confidence: 99%

Angle and time of arrival statistics for hollow-disc and elliptical scattering models

Jaafar

Boujemâa

Siala

2008

2008 2nd International Conference on Signals, Circuits and Systems

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This paper derives explicit closed-form expressions for the joint/marginal probability density functions of the uplink/downlink multipaths' time-of-arrival (TOA) and azimuth angle-of-arrival (AOA) in a wireless-communication fading channel. These models assume that the scatterers lie within a hollowdisc and an elliptical space, respectively. These probability density functions (pdf) provide insight into the properties of the spatial wireless channel.

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Analysis of CDMA cellular radio systems employing adaptive antennas in multipath environments

Cited by 18 publications

References 10 publications

28 GHz propagation measurements for outdoor cellular communications using steerable beam antennas in New York city

28 GHz propagation measurements for outdoor cellular communications using steerable beam antennas in New York city

28 GHz millimeter wave cellular communication measurements for reflection and penetration loss in and around buildings in New York city

Angle and time of arrival statistics for hollow-disc and elliptical scattering models

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