Method and apparatus for band separation for multiband communication systems
Aspects of a method and apparatus for band separation for multiband communication systems are provided. One or more circuits for use in a transceiver may comprise a triplexer and a leakage processing module. The triplexer may comprise a first port, a Multimedia Over Coaxial Alliance (MoCA) port, a television upstream port, and a television downstream port. The leakage processing module may comprise a television downstream input port, a cable television downstream output port, a MoCA port, and a cable television upstream port. The leakage processing module may be operable to (1) process a MoCA signal to generate a first compensation signal; (2) process a cable upstream signal to generate a second compensation signal; (3) process a filtered signal based at least in part on the first and second compensation signals; and (4) output the processed filtered signal via the cable television downstream output port of said leakage processing module.
1. A system comprising:
one or more circuits for use in a transceiver, wherein:
said one or more circuits comprise a filter and a leakage processing module;
said filter comprises a first port, a first-protocol port, a second-protocol upstream port, and a second-protocol downstream port;
said leakage processing module comprises a second-protocol downstream input port, a second-protocol downstream output port, a first-protocol port, and a second-protocol upstream port; and
said leakage processing module is operable to:
process a first-protocol signal received via said first-protocol port of said leakage processing module via a first impedance network to generate a first compensation signal;
process a second-protocol signal received via said second-protocol upstream port of said leakage processing module via a second impedance network to generate a second compensation signal;
receive a filtered signal received from said second-protocol downstream port of said filter;
subtract said first compensation signal from said signal received from said second-protocol downstream port;
subtract said second compensation signal from said signal received from said second-protocol downstream port to generate a processed filtered signal; and
output said processed filtered signal via said second-protocol downstream output port of said leakage processing module.
2. The system of claim 1 , wherein:
said first impedance network is configured based on a measured or estimated leakage between said first-protocol port of said filter and said second-protocol downstream port of said filter; and
said second impedance network is configured based on a measured or estimated leakage between said second-protocol upstream port of said filter and said second-protocol downstream port of said filter.
3. The system of claim 1 , wherein said first impedance network and said second impedance network are configured dynamically while said transceiver is receiving second-protocol downstream signals and processing said received second-protocol downstream signals for output to a television or monitor.
4. The system of claim 1 , wherein a transfer function of said first impedance network and a transfer function of said second impedance network are fixed.
5. The system of claim 1 , wherein said one or more circuits are operable to:
digitize said first-protocol signal prior to said first-protocol signal being input to said first-protocol port of said leakage processing module;
digitize said second protocol upstream signal prior to said second protocol upstream signal being input to said second protocol upstream port of said leakage processing module.
6. The system of claim 1 , wherein:
said leakage processing module is a first leakage processing module;
said one or more circuits comprise a second leakage processing module; and
said processed filtered signal output via said second-protocol downstream output port is input to said second leakage processing module.
7. The system of claim 6 , wherein:
said first leakage processing module operates in the analog domain; and
said second leakage processing module operates in the digital domain.
8. The system of claim 1 , wherein:
said one or more circuits comprise a first-protocol Tx/Rx selection module which is operable to process a first-protocol composite signal to separate transmit components of said first-protocol composite signal from receive components of said first-protocol composite signal; and
said first-protocol signal received via said first-protocol port of said leakage cancellation module is an output of said first-protocol Tx/Rx selection module.
9. The system of claim 1 , wherein a protocol of said first-protocol signal is a Multimedia over Coaxial Alliance (MoCA) protocol and a protocol of said second-protocol signal is a cable television or Data Over Cable Service Interface Specification (DOCSIS) protocol.
10. The system of claim 1 , wherein said filter is a triplexer.
11. The system of claim 1 wherein:
said processing said first-protocol signal comprises applying a first transfer function to said first-protocol signal, wherein said first transfer function approximates a first leakage transfer function of said filter.
12. A system comprising:
one or more circuits for use in a transceiver, wherein:
said one or more circuits comprise a filter and a leakage processing module;
said filter comprises a first port, a first-protocol port, and a second-protocol downstream port;
said leakage processing module comprises a second-protocol downstream input port, a second-protocol downstream output port, and a first-protocol port;
said leakage processing module is operable to:
process a first-protocol signal received via said first-protocol port of said leakage processing module via an impedance network to generate a compensation signal, wherein a transfer function of said impedance network approximates a leakage transfer function of said filter said and said processing said second-protocol signal comprises application of said transfer function to said first-protocol signal to generate said compensation signal;
receive a filtered signal from said second-protocol downstream port of said filter;
subtract said compensation signal from said filtered signal to generate a processed filtered signal; and
output said processed filtered signal via said second-protocol downstream output port of said leakage processing module.
13. The system of claim 12 , wherein:
said impedance network is configured based on a measured or estimated leakage between said first-protocol port of said filter and said second-protocol downstream port of said filter.
14. The system of claim 12 , wherein said impedance network is dynamically configurable during reception of second-protocol downstream signals and processing of said received second-protocol downstream signals for output to a second-protocol or monitor.
15. The system of claim 12 , wherein said transfer function of said impedance network is fixed.
16. The system of claim 12 , wherein said one or more circuits are operable to digitize said first-protocol signal prior to said first-protocol signal being input to said first-protocol port of said leakage processing module.
17. The system of claim 12 , wherein:
said leakage processing module is a first leakage processing module;
said one or more circuits comprise a second leakage processing module; and
said processed filtered signal output via said second-protocol downstream output port is input to said second leakage processing module.
18. The method of claim 17 , wherein:
said processing of said second-protocol signal comprises application of a second transfer function to said second-protocol signal, wherein said second transfer function approximates a second leakage transfer function of said filter.