Radio transmitter-receiver system for increasing or decreasing communication channels
First Claim
1. A radio transmitter-receiver apparatus for increasing or decreasing communication channels between node stations of a communication network, said apparatus comprising:
- a plurality of antenna means for receiving input RF signals and for transmitting output RF signals;
a plurality of transmitter-receiver means including RF portions and IF portions, said RF portions receiving the input RF signals from one of said antenna means and supplying the output RF signals to one of said antenna means, intermediate frequency output signals from said IF portions supplied to said RF portions and converted to the output RF signals, the input RF signals converted to intermediate frequency input signals and supplied to said IF portions, baseband input signals converted to the intermediate frequency output signals and supplied to said RF portions, the intermediate frequency input signal from said RF portions converted at said IF portions to baseband output signals, each of said IF portions being provided with a local oscillator generating a variable frequency;
IF multiplexer means, provided between said RF portions and said IF portions of said plurality of transmitter-receiver means, for receiving the intermediate frequency output signals from a plurality of said IF portions and supply multiplexed signals to said RF portions;
IF divider means for receiving the intermediate frequency input signals from said RF portions and supplying division signals to the plurality of said IF portions; and
a plurality of communication lines, each having a different frequency, provided between said plurality of antenna means forming the communication network.
1 Assignment
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Accused Products
Abstract
The radio transmitter-receiver system for increasing or decreasing communication channels comprises radio transmitter-receivers each including a separated intermediate frequency portion for modulation and demodulation and a separated microwave portion, and having a multiplexer and a divider therebetween. Local oscillators in the intermediate frequency portion have a variable frequency function and the operating frequency of the intermediate frequency portion can be easily changed. The intermediate frequency portions are connected to the microwave portions through the multiplexer or the divider and the frequency of the microwave to be communicated is easily changed. Thus, an increase or decrease of the communication channels is possible at a low cost.
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Citations
10 Claims
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1. A radio transmitter-receiver apparatus for increasing or decreasing communication channels between node stations of a communication network, said apparatus comprising:
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a plurality of antenna means for receiving input RF signals and for transmitting output RF signals; a plurality of transmitter-receiver means including RF portions and IF portions, said RF portions receiving the input RF signals from one of said antenna means and supplying the output RF signals to one of said antenna means, intermediate frequency output signals from said IF portions supplied to said RF portions and converted to the output RF signals, the input RF signals converted to intermediate frequency input signals and supplied to said IF portions, baseband input signals converted to the intermediate frequency output signals and supplied to said RF portions, the intermediate frequency input signal from said RF portions converted at said IF portions to baseband output signals, each of said IF portions being provided with a local oscillator generating a variable frequency; IF multiplexer means, provided between said RF portions and said IF portions of said plurality of transmitter-receiver means, for receiving the intermediate frequency output signals from a plurality of said IF portions and supply multiplexed signals to said RF portions; IF divider means for receiving the intermediate frequency input signals from said RF portions and supplying division signals to the plurality of said IF portions; and a plurality of communication lines, each having a different frequency, provided between said plurality of antenna means forming the communication network. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A radio transmitter-receiver apparatus for increasing or decreasing communication channels comprising:
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(a) a plurality of transmitter-receiver stations; and (b) a plurality of communication lines, each having a different frequency band, provided between said transmitter-receiver stations, each of said transmitter-receiver stations including (i) antenna means for receiving input radio frequency signals and transmitting output radio frequency signals, and (ii) a plurality of transmitter-receivers, comprising (1) radio frequency receiving means for receiving received radio frequency signals from the antenna means and converting the received radio frequency signals to first intermediate frequency signals, (2) first intermediate frequency means for receiving the first intermediate frequency signals from aid radio frequency receiving means and providing baseband outputs, (3) second intermediate frequency means for receiving baseband inputs, converting the baseband inputs to second intermediate frequency signals and outputting the second intermediate frequency signals, (4) radio frequency transmitting means for receiving the second intermediate frequency signals from the second intermediate frequency means, converting the second intermediate frequency signals to transmission radio frequency signals, and outputting the transmission radio frequency signals to the antenna means, (5) intermediate frequency multiplexer means, provided between the second intermediate frequency means and the radio frequency transmitting means, for receiving the second intermediate frequency signals from the second intermediate frequency means and supplying the second intermediate frequency signals in a single output to the radio frequency transmitting means, and (6) intermediate frequency divider means provided between the radio frequency receiving means and the first intermediate frequency means, for receiving the first intermediate frequency signals from the radio frequency receiving means and dividing and outputting the first intermediate frequency signals among the first intermediate frequency means. - View Dependent Claims (8, 9, 10)
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Specification