Method and system providing RF distribution for fixed wireless local loop service
First Claim
1. A method for receiving a RF signal contained in a RF bandwidth from a wireless local loop base station and transmitting said RF signal over a low bandwidth medium having a transmission bandwidth below said RF bandwidth, said method comprising:
- a) intercepting said RF signal from said wireless local loop base station;
b) providing said system with 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.
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Accused Products
Abstract
A system and method is disclosed for distributing a radio frequency (RF) signal within a building structure or other structure not readily transparent to radio frequencies. The RF signal originates at a wireless local loop (WLL) base station and is intercepted by a main antenna on the building structure. The intercepted RF signal, which is contained in a RF bandwidth, is distributed throughout the building structure over a low bandwidth medium, e.g., in-building cabling, which has a transmission bandwidth below the RF bandwidth. In order to accomplish this, the system has a global reference oscillator for distributing a global reference tone of high stability to the entire system. Local oscillators controlled by this global reference tone 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 to remote sites. At the remote sites the RF signal recovered from the IF signal by mixing with the RF reference tone and re-transmitted, often to WLL communication units. When the WLL base station has a connection to the Public Switch Telephone Network (PSTN), the WLL communication units provide users with wireless telephone services.
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Citations
22 Claims
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1. A method for receiving a RF signal contained in a RF bandwidth from a wireless local loop base station and transmitting said RF signal over a low bandwidth medium having a transmission bandwidth below said RF bandwidth, said method comprising:
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a) intercepting said RF signal from said wireless local loop base station; b) providing said system with 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 (2, 3, 4, 5, 6, 7, 8)
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9. A system for receiving a RF signal contained in a RF bandwidth from a wireless local loop base station and transmitting said RF signal 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 intercepting said RF signal from said wireless local loop base station; 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 (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification