Patent
Cellular communications system with centralized base stations and distributed antenna units
TLDR
In this paper, a microcellular communications network includes a plurality of base station units and corresponding antenna units, each of which includes either conventional transmitters and receivers or all digital transmitter and receiver equipment, and interface circuitry to a mobile telecommunications switching office.Abstract:
A microcellular communications network includes a plurality of base station units and corresponding antenna units. The base station units are housed in a common location. Each includes either conventional transmitters and receivers or all digital transmitter and receiver equipment, and interface circuitry to a mobile telecommunications switching office. The microcell traffic output is applied to a frame generator/multiplexer. The output of the frame generator/multiplexer is applied to a digitally modulated laser. The laser output is conveyed by fiber to a remote antenna unit, which demultiplexes the microcell traffic signal and applies it to a digital-to-analog converter. The output of the digital-to-analog converter is applied to a power amplifier, which in turn is connected to a main antenna. RF signals from the mobile units are received at both a main and a diversity antenna. The received signals are filtered, digitized, multiplexed together and transmitted over the optical fiber back to the base station. The strongest signal is selected for use.read more
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References
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Patent
System and method for generating signal waveforms in a CDMA cellular telephone system
Klein S. Gilhousen,Irwin M. Jacobs,Roberto Padovani,Lindsay A. Weaver,Wheatley Charles E,Andrew J. Viterbi +5 more
TL;DR: In this paper, a system and method for communicating information signals using spread spectrum communication techniques is presented, where PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better link performance.
Patent
Mobile station assisted soft handoff in a CDMA cellular communications system
TL;DR: In this article, a mobile station monitors the signal strength of pilots and reports the measured signal strength to a system controller via the base station through which it is communicating and terminates communication through the corresponding base station while communications through the other base station or base stations continue.
Patent
Cdma microcellular telephone system and distributed antenna system therefor
TL;DR: In this article, a code division multiple access (CDMA) communication system in which cellular techniques are utilized in a wireless Private Branch Exchange (PBX) environment is defined in which a base station (10) communicates user information signals using CDMA communication signals with subscriber terminals.
Patent
Neighbor-assisted handoff in a cellular communications system
Anna Fallgren,Claes Andersson +1 more
TL;DR: In this paper, a handoff system where handoff requests are initiated not only by a home or serving base station, but also by neighboring base stations is proposed. But the handoff request may come from a home base station because of a poor call connection or from a neighboring base station due to a possible strong call connection.
Patent
Cordless telephone system
TL;DR: In this paper, the authors present a key telephone system consisting of cordless telephone stations (FIGS. 6 and 7) which communicate over a line-of-sight transmission end link (276 or 277).