Method and system for improving dynamic range for communication systems using upstream analog information
View Patent ↗The receiver is provided which comprises a mixer, a low pass filter coupled to the mixer and a plurality of gain controllers serially coupled to an output of the low pass filter (LPF). A plurality of analog-to-digital converters (ADCs) is coupled so that an input of a first of the ADCs is coupled to the output of the LPF. An input of each of a remaining portion of the ADCs is individually coupled to a corresponding output of each of the serially coupled gain blocks. An output path traced from the output of the LPF to an output of each of the analog-to-digital converters may be referred to as a processing path. Each processing path may comprise a gain controller and an ADC, except for the first processing path, which may have an ADC coupled directly to the output of the LPF.
1. A method for processing received signals in a communication system, the method comprising:
receiving an RF signal;
generating a plurality of narrowband signals from said received RF signals;
converting said at least a portion of said generated plurality of upstream narrowband signals to corresponding digital signals;
calculating an intermediate gain, which enables carrier sense detection, for each of said at least a portion of said generated plurality of upstream narrowband signals based on a power of each of said corresponding digital signals and based on whether said of each of said corresponding digital signals is clipped; and
adjusting a final gain of said received RF signal based on said calculated intermediate gain of each of said at least a portion of said generated plurality of upstream narrowband signals.
2. The method according to claim 1 , comprising sampling said each of said at least a portion of said generated plurality of upstream narrowband signals during a training period.
3. The method according to claim 2 , comprising determining a power of said each of said at least a portion of said generated plurality of upstream narrowband signals based on said sampling.
4. The method according to claim 3 , comprising summing samples resulting from said sampling to determine said power of said each of said at least a portion of said generated plurality of upstream narrowband signals.
5. The method according to claim 4 , comprising comparing said determined power of said each of said at least a portion of said generated plurality of upstream narrowband signals to defined threshold values.
6. The method according to claim 5 , comprising selecting said final gain based on said comparing.
7. The method according to claim 5 , comprising selecting a comparable power value corresponding to one of said defined threshold values as said final gain.
8. The method according to claim 5 , wherein said defined threshold values are stored in a lookup table.
9. The method according to claim 1 , comprising determining whether said corresponding digital signals is clipped during a preamble portion of packets in said received RF signals.
10. The method according to claim 1 , comprising applying said calculated intermediate gain that enables said carrier sense detection to each of said at least a portion of said generated plurality of upstream narrowband signals.
11. A computer-readable medium having stored thereon, a computer program having at least one code section for processing received signals in a communication system, the at least one code section being executable by a computer for causing the computer to perform steps comprising:
receiving an RF signal;
generating a plurality of narrowband signals from said received RF signals;
converting said at least a portion of said generated plurality of upstream narrowband signals to corresponding digital signals;
calculating an intermediate gain, which enables carrier sense detection, for each of said at least a portion of said generated plurality of upstream narrowband signals based on a power of each of said corresponding digital signals and based on whether said of each of said corresponding digital signals is clipped; and
adjusting a final gain of said received RF signal based on said calculated intermediate gain of each of said at least a portion of said generated plurality of upstream narrowband signals.
12. The computer-readable medium according to claim 11 , comprising code for sampling said each of said at least a portion of said generated plurality of upstream narrowband signals during a training period.
13. The computer-readable medium according to claim 12 , comprising code for determining a power of said each of said at least a portion of said generated plurality of upstream narrowband signals based on said sampling.
14. The computer-readable medium according to claim 13 , comprising code for summing samples resulting from said sampling to determine said power of said each of said at least a portion of said generated plurality of upstream narrowband signals.
15. The computer-readable medium according to claim 14 , comprising code for comparing said determined power of said each of said at least a portion of said generated plurality of upstream narrowband signals to defined threshold values.
16. The computer-readable medium according to claim 15 , comprising selecting said final gain based on said comparing.
17. The computer-readable medium according to claim 15 , comprising code for selecting a comparable power value corresponding to one of said defined threshold values as said final gain.
18. The computer-readable medium according to claim 15 , wherein said defined threshold values are stored in a lookup table.
19. The computer-readable medium according to claim 11 , comprising code for determining whether said corresponding digital signals is clipped during a preamble portion of packets in said received RF signals.
20. The computer-readable medium according to claim 11 , comprising code for applying said calculated intermediate gain that enables said carrier sense detection to each of said at least a portion of said generated plurality of upstream narrowband signals.
21. A system for processing received signals in a communication system, the system comprising:
at least one processor that enables receiving of an RF signal;
said at least one processor enables generation of a plurality of narrowband signals from said received RF signals;
said at least one processor enables converting of said at least a portion of said generated plurality of upstream narrowband signals to corresponding digital signals;
said at least one processor enables calculation of an intermediate gain, which enables carrier sense detection, for each of said at least a portion of said generated plurality of upstream narrowband signals based on a power of each of said corresponding digital signals and based on whether said of each of said corresponding digital signals is clipped; and
said at least one processor enables adjusting of a final gain of said received RF signal based on said calculated intermediate gain of each of said at least a portion of said generated plurality of upstream narrowband signals.
22. The system according to claim 21 , wherein said at least one processor enables sampling of said each of said at least a portion of said generated plurality of upstream narrowband signals during a training period.
23. The system according to claim 22 , wherein said at least one processor enables determining of a power of said each of said at least a portion of said generated plurality of upstream narrowband signals based on said sampling.
24. The system according to claim 23 , wherein said at least one processor enables summing of samples resulting from said sampling to determine said power of said each of said at least a portion of said generated plurality of upstream narrowband signals.
25. The system according to claim 24 , wherein said at least one processor enables comparing of said determined power of said each of said at least a portion of said generated plurality of upstream narrowband signals to defined threshold values.
26. The system according to claim 25 , wherein said at least one processor enables selecting of said final gain based on said comparing.
27. The system according to claim 25 , wherein said at least one processor enables selecting of a comparable power value corresponding to one of said defined threshold values as said final gain.
28. The system according to claim 25 , wherein said defined threshold values are stored in a lookup table.
29. The system according to claim 21 , wherein said at least one processor enables determining of whether said corresponding digital signals is clipped during a preamble portion of packets in said received RF signals.
30. The system according to claim 21 , wherein said at least one processor enables applying of said calculated intermediate gain that enables said carrier sense detection to each of said at least a portion of said generated plurality of upstream narrowband signals.