Patent
Cellular digital mobile radio system with plural base station transmitters and method of transmitting information in such a system
TLDR
In this article, the authors proposed a method of transmitting message information digitally between mobile and base stations in a cellular digital mobile radio system including base stations (Bm, Bn) and mobile stations (MS1, MS2) with transmitters and receivers.Abstract:
The invention relates to a cellular digital mobile radio system including base stations (Bm, Bn) and mobile stations (MS1, MS2) with transmitters and receivers. The invention also relates to a method of transmitting message information digitally between mobile and base stations in such a system. In accordance with the invention, at least two base station transmitters (Bma, Bmb, Bna, Bnb) at a given transmitting distance from each other are assigned to each of certain cells (Cm, Cn) within a restricted geographical area. The base station transmitters which are assigned to the same cell transmit digitally modulated radio signals within the same frequency range at least partially simultaneously to the mobile stations of the cell. The radio signals from different base station transmitters associated with the same cell are digitally modulated with the same message information to the mobile stations in the cell. Different base station transmitters (9A, 9B) preferably transmit the digitally modulated radio signals with the same message information to a given mobile station with a given mutual transmission time shift. Here, the transmission time shift is selected individually for each mobile station, such that corresponding digitally modulated radio signals with the same message information to a given mobile station from different base station transmitters arrive practically simultaneously at the mobile station.read more
Citations
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References
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Patent
Simulcast transmission system having automtic synchronization
TL;DR: In this paper, an improved simulcast transmission system having automatic synchronization is disclosed which utilizes a signal from any one of a number of readily available master timing sources to maintain a constant, uniform time delay to a multiplicity of transmitters even though the time delay corresponding to an included individual interconnect link is susceptible to variation.
Patent
Automatic synchronization system
TL;DR: In this article, an improved synchronization system for use with simulcast transmission systems is described, which utilizes a centrally located master transmitter and control unit and a plurality of secondary transmitters disposed in an annular fashion around the master transmitter.
Patent
Simulcast transmission system
TL;DR: In this paper, a control center establishes transmission links to the transmitter sites and includes electronic storage which supplies the required time delay for each signal applied over a predetermined link to assure phase coherency of overlapping transmissions.
Patent
Automatic equalization for a simulcast communication system
TL;DR: In this paper, the same audio signal is simultaneously broadcasted from a plurality of base stations located remotely from a dispatch station used to transmit this audio signal to each of the base stations over conventional telephone lines.
Patent
Method and arrangement for the simultaneous transmission of information by several common-wave transmitters
Hans Bürk,Jochen Dipl.-Ing. Drake,Karl-Heinz Kersten,Harry Koch,Alfred Plischke,Rudolf Ing. Grad. Ribhegge,Hans Peter Ing. Grad. Roll +6 more
TL;DR: In this article, the authors propose a method for the simultaneous transmission of communications over several common frequency transmitters, characterized by the fact that the communications are stored or delayed in the common frequency receivers for a waiting time until the longest possible transit time of the communications from the exchange to the common receiver has elapsed and that the transmissions are then transmitted synchronously by the common receivers on a not necessarily periodic timing signal.