CA2489569A1 - Improving hierarchical 8psk performance - Google Patents

Improving hierarchical 8psk performance Download PDF

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Publication number
CA2489569A1
CA2489569A1 CA002489569A CA2489569A CA2489569A1 CA 2489569 A1 CA2489569 A1 CA 2489569A1 CA 002489569 A CA002489569 A CA 002489569A CA 2489569 A CA2489569 A CA 2489569A CA 2489569 A1 CA2489569 A1 CA 2489569A1
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Prior art keywords
signal
symbols
modulation
modulated signal
hierarchically modulated
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Granted
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CA002489569A
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French (fr)
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CA2489569C (en
Inventor
Ernest C. Chen
Joseph Santoru
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DirecTV Group Inc
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Individual
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H04L1/208—Arrangements for detecting or preventing errors in the information received using signal quality detector involving signal re-encoding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/183—Multiresolution systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0098—Unequal error protection

Abstract

A method and receiver systems for demodulating and decoding a hierarchically modulated signal, e.g. an 8PSK signal, are disclosed. An exemplary method includes demodulating and processing (502) the hierarchically modulated signal (202) to produce symbols (212) from the first modulation at the first hierarchical level, applying information (504) from a plurality of the symbols from the first modulation at the first hierarchical level in subtracting (214) from the demodulated hierarchically modulated signal to obtain the second modulation at the second hierarchical level and processing (506) the second modulation at the second hierarchical level to produce second symbols (222) from the demodulated second signal. The hierarchically modulated signal comprises a non-uniform 8PSK signal. Applying the information from the plurality of the symbols from the first modulation can be achieved by applying the symbols after error correction. A decision-directed demodulation of the first modulation can also be used to further improve performance.

Claims (16)

1. A method for demodulating and decoding a hierarchically modulated signal (202) having a first modulation at a first hierarchical level and a second modulation at a second hierarchical level, comprising the steps of:
demodulating and processing (502) the hierarchically modulated signal (202) to produce symbols (212) from the first modulation at the first hierarchical level;
applying information (504) from a plurality of the symbols from the first modulation at the first hierarchical level (212) in subtracting (214) from the demodulated hierarchically modulated signal to obtain the second modulation at the second hierarchical level; and processing (506) the second modulation at the second hierarchical level to produce second symbols (222) from the demodulated second signal;
wherein the hierarchically modulated signal comprises a non-uniform 8PSK
signal.
2. The method of claim 1, wherein applying information from the plurality of the symbols from the first modulation at the first hierarchical level comprises applying the symbols from the first modulation at the first hierarchical level after error correction (304).
3. The method of claim 2, wherein applying information from the plurality of the symbols includes performing an FEC-corrected demodulation (402) on the hierarchically modulated signal (202).
4. The method of claim 2, wherein the error correction comprises a forward error correction (FEC) process (210).
5. The method of claim 1, wherein processing the hierarchically modulated signal (202) to produce symbols from the first modulation at the first hierarchical level (212) includes a decision-directed tamer recovery process.
6. The method of claim 1, wherein the plurality of the symbols from the first modulation at the first hierarchical level (304) are re-encoded (302) before being subtracted (214) from the demodulated hierarchically modulated signal (206, 404).
7. The method of claim 1, wherein the hierarchically modulated signal (202) is coherent and processing the second modulation at the second hierarchical level to produce second symbols (222) includes decoding (218) the second modulated signal.
8. The method of claim 7, wherein the hierarchically modulated signal (202) is non-coherent and processing the second modulation at the second hierarchical level to produce second symbols (222) further includes demodulating (216) the second modulated signal.
9. A receiver system for performing any of the methods of claims 1 - 8, comprising:
a first demodulator (204) for demodulating the first modulation of the hierarchically modulated signal (202);
a symbol decoder (208), communicatively coupled to the first demodulator, for producing symbols from the demodulated first signal;
an error decoder (210), communicatively coupled to the symbol decoder (208), for producing an error corrected symbol stream (304) from the symbols from the demodulated first signal;
a re-encoder (302) for re-encoding the error corrected symbol stream (304);

a subtractor (214), communicatively coupled to the re-encoder (302) and the first demodulator (204), for subtracting the re-encoded symbol stream from the first signal to produce a second signal; and a second symbol decoder (218), communicatively coupled to the subtractor (214) for producing second symbols from the second signal.
10. The receiver system of claim 9, further comprising a second level demodulator (216), communicatively coupled between the subtractor (214) and the second symbol decoder (218) for demodulating the second signal from the subtractor (214) and providing the demodulated second signal to the second symbol decoder (218);
wherein the hierarchically modulated signal is non-coherent.
11. The receiver system of claim 9, wherein the hierarchically modulated signal (202) is coherent.
12. The receiver system of claim 9, wherein the error decoder (210) comprises a forward error correction (FEC) decoder.
13. A receiver system for performing any of the methods of claims 1 - 8, comprising:
a first demodulator (204) for demodulating the first modulation of the hierarchically modulated signal;
a symbol decoder (208), communicatively coupled to the first demodulator, for producing symbols from the demodulated first signal;
an error decoder (210), communicatively coupled to the symbol decoder (208), for producing an error corrected symbol stream (304) from the symbols from the demodulated first signal;
a re-encoder (302) for re-encoding the error corrected symbol stream (304);

an error correcting demodulator (402), communicatively coupled to the re-encoder (302) for demodulating the hierarchical signal (202) using the error corrected and re-encoded symbols from the demodulated first signal.
a subtractor (214), communicatively coupled to the re-encoder (302) and the an error correcting demodulator (402), for subtracting the re-encoded symbol stream (404) from the error correcting demodulated hierarchical signal to produce a second signal; and a second symbol decoder (218), communicatively coupled to the subtractor (214) for producing second symbols from the second signal.
14. The receiver system of claim 13, further comprising a second level demodulator (216), communicatively coupled between the subtractor (214) and the second symbol decoder (218) for demodulating the second signal from the subtractor (214) and providing the demodulated second signal to the second symbol decoder (218);
wherein the hierarchically modulated signal is non-coherent.
15. The receiver system of claim 13, wherein the hierarchically modulated signal (202) is coherent.
16. The receiver system of claim 13, wherein the error decoder (210) comprises a forward error correction (FEC) decoder.
CA2489569A 2002-07-01 2003-07-01 Improving hierarchical 8psk performance Expired - Fee Related CA2489569C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US39286102P 2002-07-01 2002-07-01
US60/392,861 2002-07-01
PCT/US2003/020862 WO2004004193A2 (en) 2002-07-01 2003-07-01 Improving hierarchical 8psk performance

Publications (2)

Publication Number Publication Date
CA2489569A1 true CA2489569A1 (en) 2004-01-08
CA2489569C CA2489569C (en) 2012-05-22

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CA2489569A Expired - Fee Related CA2489569C (en) 2002-07-01 2003-07-01 Improving hierarchical 8psk performance

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US (2) US7418060B2 (en)
EP (1) EP1540909A4 (en)
AR (1) AR040366A1 (en)
AU (1) AU2003280499A1 (en)
CA (1) CA2489569C (en)
IL (1) IL165765A (en)
NO (1) NO338177B1 (en)
TW (1) TWI324463B (en)
WO (1) WO2004004193A2 (en)

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