Distribution of radio-frequency signals through low bandwidth infrastructures
DCFirst Claim
1. A system for transmitting a RF signal contained in a RF bandwidth over a low bandwidth medium having a transmission bandwidth below said RF bandwidth, said system comprising:
- a) a receiving means for receiving said RF signal;
b) a global reference oscillator for providing said system with a global reference tone of high stability at a frequency within said transmission bandwidth of said low bandwidth medium;
c) a first local oscillator controlled by a first adjustment signal derived from said global reference tone, such that said first local oscillator generates a first RF reference tone of high stability;
d) a first mixing means connected to said receiving means and to said first local oscillator for mixing said first RF reference tone with said RF signal to produce an IF signal within said transmission bandwidth, said first mixing means being further connected to said low bandwidth medium for feeding said IF signal through said low bandwidth medium;
e) a second local oscillator at a remote location from said first local oscillator, said second local oscillator being controlled by a second adjustment signal derived from said global reference tone, such that said second local oscillator generates a second RF reference tone of high stability at the same frequency as said first RF reference tone; and
f) a second mixing means connected to said second local oscillator and to said low bandwidth medium for receiving and mixing said IF signal with said second RF reference tone to recover said RF signal.
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Abstract
A system and method for transmitting a radio frequency (RF) signal in a RF bandwidth over a low bandwidth medium, e.g., in-building cabling, which has a transmission bandwidth below the RF bandwidth. The system has a unit for receiving the RF signal and a global reference oscillator for distributing a global reference tone of high stability to the entire system. Local oscillators are controlled by adjustment signals derived from this global reference tone to deliver RF reference tones of high stability required for mixing the RF signal to obtain an intermediate frequency (IF) signal which is fed through the low bandwidth medium. The global reference tone is preferably delivered through the same low bandwidth medium to desired locations, such as remote coverage sites in a network for cellular communications, cordless telephony, local RF communications, interactive multi-media video, high bit-rate local communications.
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Citations
30 Claims
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1. A system for transmitting a RF signal contained in a RF bandwidth over a low bandwidth medium having a transmission bandwidth below said RF bandwidth, said system comprising:
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a) a receiving means for receiving said RF signal; b) a global reference oscillator for providing said system with a global reference tone of high stability at a frequency within said transmission bandwidth of said low bandwidth medium; c) a first local oscillator controlled by a first adjustment signal derived from said global reference tone, such that said first local oscillator generates a first RF reference tone of high stability; d) a first mixing means connected to said receiving means and to said first local oscillator for mixing said first RF reference tone with said RF signal to produce an IF signal within said transmission bandwidth, said first mixing means being further connected to said low bandwidth medium for feeding said IF signal through said low bandwidth medium; e) a second local oscillator at a remote location from said first local oscillator, said second local oscillator being controlled by a second adjustment signal derived from said global reference tone, such that said second local oscillator generates a second RF reference tone of high stability at the same frequency as said first RF reference tone; and f) a second mixing means connected to said second local oscillator and to said low bandwidth medium for receiving and mixing said IF signal with said second RF reference tone to recover said RF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for transmitting a RF signal contained in a RF bandwidth over a low bandwidth medium having a transmission bandwidth below said RF bandwidth, said method comprising the steps of:
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a) receiving said RF signal; b) providing a global reference tone of high stability at a frequency within said transmission bandwidth of said low bandwidth medium; c) generating a first RF reference tone of high stability by using a first adjustment signal derived from said global reference tone to control the output of a first local oscillator, such that said first local oscillator generates said first RF reference tone; d) mixing said first RF reference tone with said RF signal to produce an IF signal within said transmission bandwidth; e) feeding said IF signal through said low bandwidth medium; f) generating a second RF reference tone of high stability by using a second adjustment signal derived from said global reference tone to control the output of a second local oscillator, such that said second local oscillator generates said second RF reference tone; and g) mixing said second RF reference tone with said IF signal fed through said low bandwidth medium to recover said RF signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification