Two-dimensional line of sight interference analysis of LMDS networks for the downlink and uplink

Ranjan Bose; Georg Bauer; Rolf Jakoby

doi:10.1109/TAP.2004.834120

Two-dimensional line of sight interference analysis of LMDS networks for the downlink and uplink

Ranjan Bose, Georg Bauer, Rolf Jakoby

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

Local multipoint distribution systems (LMDS), which are operating worldwide in the frequency range of 26 to 43 GHz, have large bandwidths of 0.1 up to 2 GHz, but a very limited area coverage due to line of sight constraints and large propagation losses. As suggested in the Cellular Radio Access for Broadband Services (CRABS) Report [1], a high spectral efficiency can be obtained for a regular network of squared cells with a dual frequency and polarization reuse scheme. However, this frequency and polarization reuse leads to cochannel and adjacent channel interference. In this paper, we report a systematic two-dimensional study of interference in such a regular LMDS network for the downlink and uplink in order to assess the impact of different geometric and propagation parameters. The paper reports simple formulas to estimate the areas of high interference levels within an LMDS cell as a function of the half-power beamwidth of the customer-site antennas for the downlink. The effect on the carrier-to-interference distribution over a LMDS cell is evaluated by varying the half-power beamwidth of the customer-site antennas, the time percentage of short term enhancement due to atmospheric multipath and focusing effects and the cell dimensions. We also introduce a simple technique by reorientation of the customer-site antennas for interference reduction. The results presented in this paper can be used to carry out system-level design for interference-limited LMDS cells.

Original language	English
Pages (from-to)	2464-2473
Number of pages	10
Journal	IEEE Transactions on Antennas and Propagation
Volume	52
Issue number	9
DOIs	https://doi.org/10.1109/TAP.2004.834120
State	Published - Sep 2004
Externally published	Yes

Funding

Manuscript received March 26, 2003; revised November 10, 2003. This work was supported in part by the Federal Ministry of Education and Research (BMBF). The work of R. Bose was supported by a fellowship from the Alexander von Humboldt Foundation. R. Bose is with the Department of Electrical Engineering, Indian Institute of Technology (IIT), New Delhi, India 110016 (e-mail: [email protected]). G. Bauer and R. Jakoby are with the Institut für Hochfrequenztechnik, Tech-nische Universität Darmstadt, 64283 Darmstadt, Germany. Digital Object Identifier 10.1109/TAP.2004.834120

Funders	Funder number
Alexander von Humboldt-Stiftung
Bundesministerium für Bildung und Forschung

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title = "Two-dimensional line of sight interference analysis of LMDS networks for the downlink and uplink",

abstract = "Local multipoint distribution systems (LMDS), which are operating worldwide in the frequency range of 26 to 43 GHz, have large bandwidths of 0.1 up to 2 GHz, but a very limited area coverage due to line of sight constraints and large propagation losses. As suggested in the Cellular Radio Access for Broadband Services (CRABS) Report [1], a high spectral efficiency can be obtained for a regular network of squared cells with a dual frequency and polarization reuse scheme. However, this frequency and polarization reuse leads to cochannel and adjacent channel interference. In this paper, we report a systematic two-dimensional study of interference in such a regular LMDS network for the downlink and uplink in order to assess the impact of different geometric and propagation parameters. The paper reports simple formulas to estimate the areas of high interference levels within an LMDS cell as a function of the half-power beamwidth of the customer-site antennas for the downlink. The effect on the carrier-to-interference distribution over a LMDS cell is evaluated by varying the half-power beamwidth of the customer-site antennas, the time percentage of short term enhancement due to atmospheric multipath and focusing effects and the cell dimensions. We also introduce a simple technique by reorientation of the customer-site antennas for interference reduction. The results presented in this paper can be used to carry out system-level design for interference-limited LMDS cells.",

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AU - Jakoby, Rolf

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AB - Local multipoint distribution systems (LMDS), which are operating worldwide in the frequency range of 26 to 43 GHz, have large bandwidths of 0.1 up to 2 GHz, but a very limited area coverage due to line of sight constraints and large propagation losses. As suggested in the Cellular Radio Access for Broadband Services (CRABS) Report [1], a high spectral efficiency can be obtained for a regular network of squared cells with a dual frequency and polarization reuse scheme. However, this frequency and polarization reuse leads to cochannel and adjacent channel interference. In this paper, we report a systematic two-dimensional study of interference in such a regular LMDS network for the downlink and uplink in order to assess the impact of different geometric and propagation parameters. The paper reports simple formulas to estimate the areas of high interference levels within an LMDS cell as a function of the half-power beamwidth of the customer-site antennas for the downlink. The effect on the carrier-to-interference distribution over a LMDS cell is evaluated by varying the half-power beamwidth of the customer-site antennas, the time percentage of short term enhancement due to atmospheric multipath and focusing effects and the cell dimensions. We also introduce a simple technique by reorientation of the customer-site antennas for interference reduction. The results presented in this paper can be used to carry out system-level design for interference-limited LMDS cells.

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Two-dimensional line of sight interference analysis of LMDS networks for the downlink and uplink

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