CDMA microcellular telephone system and distributed antenna system therefor
First Claim
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1. In a code division multiple access (CDMA) communication system in which system users communicate information signals with other system users through a base station using CDMA communication signals, said base station having an antenna system comprising:
- a plurality of spaced apart antennas;
signal distribution means for coupling CDMA communication signals between a base station and said antennas; and
delay means operatively coupled to said antennas and said signal distribution means for providing a predetermined delay in said CDMA communication signals coupled between said base station and said antennas.
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Abstract
A code division multiple access (CDMA) communication system in which cellular techniques are utilized in a wireless Private Branch Exchange (PBX) environment. A microcellular arrangement is defined in which a base station communicates user information signals using CDMA communication signals with subscriber terminals. A distributed antenna system is utilized in the system to provide multipath signals which facilitate signal diversity for enhanced system performance.
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Citations
37 Claims
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1. In a code division multiple access (CDMA) communication system in which system users communicate information signals with other system users through a base station using CDMA communication signals, said base station having an antenna system comprising:
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a plurality of spaced apart antennas; signal distribution means for coupling CDMA communication signals between a base station and said antennas; and delay means operatively coupled to said antennas and said signal distribution means for providing a predetermined delay in said CDMA communication signals coupled between said base station and said antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In a communication system in which system users communicate through a base station with remote system users, said remote system users communicating through said base station via a radio link therewith, said base station comprising:
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communication terminal means for receiving and spread spectrum modulating a system user information signal; and antenna means for, receiving said spread spectrum modulated system user information signal, providing multiple radiations of said spread spectrum modulated system user information signal with each radiation of said spread spectrum modulated system user information signal of a predetermined time delay with respect to one another. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26)
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23. A local communication system for facilitating the communication of information signals between users of said local communication system, and between users of said local communication system with users of an external network, wherein certain users of said local communication system use remote terminals to communicate within said local communication system, via a radio link with a base station, using code division multiple access communication signals, said system comprising:
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a private branch exchange (PBX); a base station coupled to said PBX comprising; communication terminal means for receiving and direct sequence spread spectrum modulating an information signal intended for a recipient remote terminal user with a pseudorandom noise (PN) spreading code comprised of a predetermined sequence of binary chips each of a predetermined chip duration time; and antenna means for, receiving said spread spectrum modulated information signal, providing multiple radiations of said spread spectrum modulated information signal with each radiation of said spread spectrum modulated information signal delayed in time with respect to one another by at least one chip duration time.
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27. In a communication system where information signals intended for transfer to a receiving terminal are transmitted from a transmitting terminal as code division multiple access communication (CDMA) signals, wherein said receiving terminal in receiving multipath propagations of each transmitted CDMA communication signal requires a minimum predetermined time difference between multipath propagations of each transmitted CDMA communication signal as received for demodulation thereof to provide said information signals intended for said receiving terminal, a method for creating multipath propagations of said transmitted CDMA signals wherein each multipath propagation is of at least said minimum predetermined time difference with respect to another upon reception at said receiving terminal, said method comprising the steps of:
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providing a plurality of spaced apart antennas; providing from said transmitting terminal a CDMA communication signal to each of said antennas; and providing a different predetermined delay in said CDMA communication signal as provided to each of said antennas. - View Dependent Claims (28)
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29. In a communications system in which an information signal is modulated at a first station with a pseudorandom noise (PN) code, comprised of a predetermined sequence of code chips each of a predetermined time duration, with said PN modulated noise signal modulated upon a carrier for transmission, an antenna system comprising:
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a plurality of antennas coupled in series to said first station; and a plurality of delay elements each disposed in series between adjacent coupled ones of said antennas. - View Dependent Claims (30, 31, 32, 33)
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34. An antenna system for transmitting and/or receiving a spread spectrum modulated information signal wherein said spread spectrum modulated information signal is generated by spread spectrum modulating an information signal with a pseudorandom noise code comprised of a predetermined sequence of code chips each of a predetermined chip duration, said antenna system comprising:
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a primary antenna system comprising a main antenna and a first set of antennas, said primary antenna system for electromagnetically coupling signals between said main antenna and said first set of antennas; a second set of antennas, each of said second set of antennas coupled to a corresponding one of said first set of antennas; a set of delay elements, each delay element disposed between a respective one of said second set of antennas and a corresponding one of said first set of antennas and providing a delay time on the order of an integer multiple of one chip duration. - View Dependent Claims (35)
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36. An antenna system for transmitting and/or receiving a spread spectrum modulated information signal wherein said spread spectrum modulated information signal is generated by spread spectrum modulating an information signal with a pseudorandom noise code comprised of a predetermined sequence of code chips each of a predetermined chip duration, said antenna system comprised of at least one antenna subsystem each comprising:
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a set of delay elements, each delay element providing a delay time on the order of an integer multiple of one chip duration in length; a set of antennas; and a system of cabling coupling together said antennas and said delay elements in a serial string, wherein said delay elements are coupled between predetermined pairs of said antennas. - View Dependent Claims (37)
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Specification