Method and apparatus for producing delay of a carrier signal for implementing spatial diversity in a communications system
First Claim
1. A method of implementing spatial diversity in a communication system, comprising:
- receiving at a first port a first signal originated from a transmitter in said communication system;
outputting a delayed version of said first signal from a second port coupled to a first antenna in said communication system;
directing, from said first port to a first end of a first transmission line, said first signal to travel down said transmission line;
reflecting, from a second end of said first transmission line coupled to a receiver in said communication system, said first signal to create delay, proportional to twice an electrical length of said first transmission line, in said first signal for producing said delayed version of said first signal;
directing said delayed version of said first signal to output from said second port;
transmitting said delayed version of said first signal and said first signal from said first antenna and a second antenna coupled to said transmitter, respectively, for implementing spatial downlink diversity.
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Abstract
A method and apparatus for implementing spatial diversity utilizing coaxial interconnections between a plurality of receivers, transmitters and radiating elements in a communication system is disclosed. The long coaxial line used for feeding associated receive antennas is used for creating delay of a signal for implementing downlink diversity. Similarly, the long coaxial lines used for feeding associated transmit antennas are used for creating delay of a signal for implementing uplink diversity. The method and apparatus, in particular, further includes utilization of at least one of the radiating elements for receiving a signal and transmitting a delayed version of a signal to be transmitted.
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Citations
11 Claims
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1. A method of implementing spatial diversity in a communication system, comprising:
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receiving at a first port a first signal originated from a transmitter in said communication system; outputting a delayed version of said first signal from a second port coupled to a first antenna in said communication system; directing, from said first port to a first end of a first transmission line, said first signal to travel down said transmission line; reflecting, from a second end of said first transmission line coupled to a receiver in said communication system, said first signal to create delay, proportional to twice an electrical length of said first transmission line, in said first signal for producing said delayed version of said first signal; directing said delayed version of said first signal to output from said second port; transmitting said delayed version of said first signal and said first signal from said first antenna and a second antenna coupled to said transmitter, respectively, for implementing spatial downlink diversity. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for implementing downlink diversity in a communication system, comprising:
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a transmitting source for transmitting a first signal at a transmit frequency from a first antenna; a splitter for producing a replica of said first signal at said transmit frequency; a receiver, at a first end of a first coaxial line, for receiving a second signal at a receive frequency, said second signal received by a second antenna; and means for directing said replica of said first signal at said transmit frequency to travel from a second end of said first coaxial line to said receiver such that said receiver reflects said replica of said first signal to produce a delayed replica of said first signal, said means for directing further directing said delayed replica of said first signal to said second antenna for transmission. - View Dependent Claims (8)
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9. A method of producing delay of a signal to implement uplink or downlink spatial diversity in a communication system, the method comprising the steps of:
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producing a first and second signal via a signal source; time delaying the first signal using a coaxial conductor of a pre-existing antenna structure to produce a time delayed version of the first signal, the pre-existing antenna structure comprising a pre-existing transmit antenna structure for uplink spatial diversity and a pre-existing receive antenna structure for downlink spatial diversity; and presenting the time delayed version of the first signal and the second signal to a receiver to implement uplink or downlink spatial diversity. - View Dependent Claims (10, 11)
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Specification