Detection and mitigation of temporary (bursts) impairments in channels using SCDMA
View Patent ↗Systems and methods are disclosed for detecting and mitigating temporary high-level impairments, in a communications channel, and subsequently, mitigating the deleterious effects of the dynamic impairments. The system includes a transmitter and a receiver. The transmitter is adapted to transmit at least one set of modulated signals. The receiver is adapted to receive the at least one set of modulated signals and mitigate temporary high-level impairment in the at least one set of modulated signals using at least one error vector received during the temporary high-level impairment.
1. A communication system for transmitting a plurality of modulated symbols, comprising:
a transmitter adapted to concurrently transmit a plurality of modulated symbols on a transmission channel, the plurality of modulated symbols together comprising a set of modulated symbols; and
a receiver operable to receive said set of concurrently transmitted modulated symbols and mitigate temporary high-level impairment associated with said set of modulated symbols using a plurality of error estimates, each error estimate corresponding to one of the plurality of modulated symbols, the receiver being operable to erase said set of modulated symbols if a sum of error powers corresponding to each of the plurality of modulated symbols exceeds a predetermined threshold.
2. The system of claim 1 , wherein said receiver may make hard decisions with respect to said set of modulated symbols and assign likelihood weightings thereto.
3. A communication system for transmitting a plurality of modulated symbols, comprising:
a transmitter operable to concurrently transmit a plurality of modulated symbols on a transmission channel, the plurality of modulated symbols together comprising a set of modulated symbols; and
a receiver operable to receive said set of concurrently transmitted modulated symbols and mitigate temporary high-level impairment associated with said set of modulated symbols using a plurality of error estimates, each error estimate corresponding to one of the plurality of modulated symbols, wherein said set of modulated symbols are weighted low likelihood if a sum of error powers corresponding to each of the plurality of modulated symbols exceeds a predetermined threshold.
4. A communication system for transmitting a plurality of SCDMA modulated symbols, comprising:
a transmitter operable to concurrently transmit a plurality of modulated symbols on a transmission channel, the plurality of modulated symbols together comprising a set of SCDMA modulated symbols; and
a receiver operable to receive said set of concurrently transmitted modulated symbols and mitigate temporary high-level impairment associated with said set of modulated symbols using a plurality of error estimates, each error estimate corresponding to one of the plurality of modulated symbols.
5. A communication system for transmitting a plurality of modulated symbols, comprising:
a transmitter operable to concurrently transmit a plurality of modulated symbols on a transmission channel, the plurality of modulated symbols together comprising a set of modulated symbols; and
a receiver operable to receive said set of concurrently transmitted modulated symbols and mitigate temporary high-level impairment associated with said set of modulated symbols using a plurality of error estimates, each error estimate corresponding to one of the plurality of modulated symbols, wherein said set of modulated symbols are erased based upon a function of error powers of all said modulated symbols.
6. A communication system for transmitting a plurality of modulated symbols, comprising:
a transmitter operable to concurrently transmit a plurality of modulated symbols on a transmission channel, the plurality of modulated symbols together comprising a set of modulated symbols; and
a receiver operable to receive said set of concurrently transmitted modulated symbols and mitigate temporary high-level impairment associated with said set of modulated symbols using a plurality of error estimates, each error estimate corresponding to one of the plurality of modulated symbols, wherein said set of modulated symbols are weighted low likelihood based upon a function of error powers of all said symbols.
7. A communication system for transmitting a plurality of modulated symbols, comprising:
a transmitter operable to concurrently transmit a plurality of modulated symbols on a transmission channel, the plurality of modulated symbols together comprising a set of modulated symbols; and
a receiver operable to receive said set of concurrently transmitted modulated symbols and mitigate temporary high-level impairment associated with said set of modulated symbols using a plurality of error estimates, each error estimate corresponding to one of the plurality of modulated symbols, wherein a plurality of error vectors are received and said receiver discards at least one error vector having an extreme value.
8. The system of claim 1 , wherein said receiver further comprises a demodulator operable to demodulate the modulated symbols.
9. The system of claim 1 , wherein said receiver comprises at least a plurality of matched filters operable to output a plurality of soft-decision values.
10. The system of claim 1 , wherein said receiver further comprising a plurality of slicers operable to output a plurality of hard-decision estimates.
11. The system of claim 1 , wherein said receiver further comprises a calculator operable to output a plurality of error estimates corresponding to the plurality of modulated symbols.
12. The system of claim 11 , wherein said calculator uses at least one soft-decision value and at least one initial hard-decision estimate to determine said error estimates.
13. The system of claim 1 , wherein said receiver further comprises a decision block operable to determine a hard-decision value.
14. The system of claim 1 , wherein said receiver is operable to make preliminary hard decisions on all said symbols and perform at least one of the following including demodulating, filtering, blanking, making assessments of distortion characteristics, matched filtering to an ideal signaling waveform and remodulating, and making at least one distortion decision and performing any additional blanking and filtering as driven by said distortion decision.
15. A communication system for transmitting a plurality of modulated symbols, comprising:
a transmitter operable to concurrently transmit a plurality of modulated symbols on a transmission channel, the plurality of modulated symbols together comprising a set of modulated symbols; and
a receiver operable to receive said set of concurrently transmitted modulated symbols and mitigate temporary high-level impairment associated with said set of modulated symbols using a plurality of error estimates, each error estimate corresponding to one of the plurality of modulated symbols, wherein said receiver is operable to make preliminary hard decisions on all said symbols and perform at least one of the following including demodulating, filtering, blanking, making assessments of distortion characteristics, matched filtering to an ideal signaling waveform and remodulating, and making at least one distortion decision and performing any additional blanking and filtering as driven by said distortion decision, wherein said receiver further makes at least one subsequent hard decision with respect to said set of modulated symbols and repairs any blanking damage and filtering using said at least one subsequent hard decision.
16. The system of claim 15 , wherein said receiver may make hard decisions with respect to said set of modulated symbols and assign likelihood weightings thereto.
17. The system of claim 15 , wherein said set of modulated symbols are erased if a sum of error powers corresponding to each of the plurality of modulated symbols exceeds a predetermined threshold.
18. The system of claim 15 , wherein said set of modulated symbols are weighted low likelihood if a sum of error powers corresponding to each of the plurality of modulated symbols exceeds a predetermined threshold.
19. The system of claim 15 , wherein the modulated signals are SCDMA modulated symbols.
20. The system of claim 15 , wherein said set of modulated symbols are erased based upon a function of error powers of all said modulated symbols.
21. The system of claim 15 , wherein said set of modulated symbols are weighted low likelihood based upon a function of error powers of all said symbols.
22. The system of claim 15 , wherein a plurality of error vectors are received and said receiver discards at least one error vector having an extreme value.
23. The system of claim 15 , wherein said receiver further comprises a demodulator operable to demodulate the modulated symbols.
24. The system of claim 15 , wherein said receiver comprises at least a plurality of matched filters operable to output a plurality of soft-decision values.
25. The system of claim 15 , wherein said receiver further comprising a plurality of slicers operable to output a plurality of hard-decision estimates.
26. The system of claim 15 , wherein said receiver further comprises a calculator operable to output a plurality of error estimates corresponding to the plurality of modulated symbols.
27. The system of claim 26 , wherein said calculator uses at least one soft-decision value and at least one initial hard-decision estimate to determine said error estimates.
28. The system of claim 15 , wherein said receiver further comprises a decision block operable to determine a hard-decision value.