Source: http://www.google.com/patents/US7577213?dq=4182933
Timestamp: 2014-12-26 03:34:59
Document Index: 5431011

Matched Legal Cases: ['Application No. 2502924', 'Application No. 2489569', 'Application No. 2503532', 'Application No. 2491259', 'Application No. 2491259', 'Application No. 200410100591', 'Application No. 03757359', 'Application No. 03794510', 'Application No. 07075745', 'Application No. 04256234', 'Application No. 03742400', 'Application No. 03777694', 'Application No. 03742393', 'Application No. 03774848', 'Application No. 03777627', 'Application No. 03742393', 'Application No. 03774848', 'Application No. 02728894', 'Application No. 07075745', 'Application No. 164482', 'Application No. 2004', 'Application No. 20026115', 'art 1', 'Application No. 092129629']

Patent US7577213 - Hierarchical 8PSK performance - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA 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...http://www.google.com/patents/US7577213?utm_source=gb-gplus-sharePatent US7577213 - Hierarchical 8PSK performanceAdvanced Patent SearchPublication numberUS7577213 B2Publication typeGrantApplication numberUS 12/176,533Publication dateAug 18, 2009Filing dateJul 21, 2008Priority dateJul 1, 2002Fee statusPaidAlso published asCA2489569A1, CA2489569C, EP1540909A2, EP1540909A4, US7418060, US20060056541, US20080298505, WO2004004193A2, WO2004004193A3Publication number12176533, 176533, US 7577213 B2, US 7577213B2, US-B2-7577213, US7577213 B2, US7577213B2InventorsErnest C. Chen, Joseph SantoruOriginal AssigneeThe Directv Group, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (103), Non-Patent Citations (79), Referenced by (2), Classifications (10), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetHierarchical 8PSK performanceUS 7577213 B2Abstract 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.
processing the second modulation at the second hierarchical level to produce second symbols from the second modulation at the second hierarchical level;
wherein the hierarchically modulated signal is non-coherent and processing the second modulation at the second hierarchical level to produce second symbols further includes demodulating the second modulation at the second hierarchical level.
7. A receiver system for demodulating and decoding a hierarchically modulated signal having a first modulation at a first hierarchical level and a second modulation at a second hierarchical level, comprising:
a second symbol decoder, communicatively coupled to the subtractor for producing second symbols from the second signal;
wherein the hierarchically modulated signal is non-coherent and the receiver system further comprises a second level demodulator, communicatively coupled between the subtractor and the second symbol decoder for demodulating the second signal from the subtractor and providing the demodulated second signal to the second symbol decoder.
8. The receiver system of claim 7, wherein the error decoder comprises a forward error correction decoder.
9. The receiver system of claim 7, wherein the hierarchically modulated signal comprises a non-uniform eight phase shift keyed signal.
CROSS REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. patent application Ser. No. 10/519,322, filed Dec. 23, 2004 and entitled �IMPROVING HIERARCHICAL 8PSK PERFORMANCE,� by Ernest C. Chen et al., which was the National Stage of the International Application No. PCT/US2003020862, filed Jul. 1, 2003 and entitled �IMPROVING HIERARCHICAL 8PSK PERFORMANCE,� Ernest C. Chen et al., which claims priority to U.S. Provisional Patent Application Ser. No. 60/392,861, filed on Jul. 1, 2002, and entitled �IMPROVING HIERARCHICAL 8PSK PERFORMANCE,� by Ernest C. Chen et al., both of which applications are hereby incorporated by reference herein.
Application Ser. No. 11/655,001, entitled �AN OPTIMIZATION TECHNIQUE FOR LAYERED MODULATION,� filed on Jan. 18, 2007, by Weizheng W. Wang, Guancai Zhou, Tung-Sheng Tin, Ernest C. Chen, Joseph Santoru, and William Lindsey, which claims priority to Provisional Patent Application 60/421,293, filed Oct. 25, 2002, and which is a continuation of application Ser. No. 10/693,140, entitled �OPTIMIZATION TECHNIQUE FOR LAYERED MODULATION,� filed on Oct. 24, 2003, by Weizheng W. Wang, Guancai Zhou, Tung-Sheng Tin, Ernest C. Chen, Joseph Santoru, and William Lindsey, now issued as U.S. Pat. No. 7,184,489, which is a continuation-in-part of application Ser. No. 09/844,401, entitled �LAYERED MODULATION FOR DIGITAL SIGNALS,� filed on Apr. 27, 2001, by Ernest C. Chen, now issued as U.S. Pat. No. 7,209,524;
Application Ser. No. 10/532,632, entitled �LOWER COMPLEXITY LAYERED MODULATION SIGNAL PROCESSOR,� filed on Apr. 25, 2005, by Ernest C. Chen, Weizheng W. Wang, Tung-Sheng Lin, Guangcai Zhou, and Joe Santoru, which is a National Stage Application of PCT US03/32264, filed Oct. 10, 2003, which claims priority to Provisional Patent Application 60/421,331, entitled �LOWER COMPLEXITY LAYERED MODULATION SIGNAL PROCESSOR,� filed Oct. 25, 2002, by Ernest C. Chen, Weizheng W. Wang, Tung-Sheng Lin, Guangcai Zhou, and Joe Santoru, and which is a continuation-in-part of application Ser. No. 09/844,401, entitled �LAYERED MODULATION FOR DIGITAL SIGNALS,� filed on Apr. 27, 2001, by Ernest C. Chen, now issued as U.S. Pat. No. 7,209,524;
Application Ser. No. 10/532,631, entitled �FEEDER LINK CONFIGURATIONS TO SUPPORT LAYERED MODULATION FOR DIGITAL SIGNA,� filed on Apr. 25, 2005, by Paul R. Anderson, Joseph Santom and Ernest C. Chen, which is a National Phase Application of PCT US03/33255, filed Oct. 20, 2003, which claims priority to Provisional Patent Application 60/421,328, entitled �FEEDER LINK CONFIGURATIONS TO SUPPORT LAYERED MODULATION FOR DIGITAL SIGNALS,� filed Oct. 25, 2002, by Paul R. Anderson, Joseph Santom and Ernest C. Chen, and which is a continuation-in-part of application Ser. No. 09/844,401, entitled �LAYERED MODULATION FOR DIGITAL SIGNALS,� filed on Apr. 27, 2001, by Ernest C. Chen, now issued as U.S. Pat. No. 7,209,524;
Application Ser. No. 10/532,582, entitled �METHOD AND APPARATUS FOR TAILORING CARRIER POWER REQUIREMENTS ACCORDING TO AVAILABILITY IN LAYERED MODULATION SYSTEMS,� filed on Apr. 25, 2005, by Ernest C. Chen, Paul R. Anderson and Joseph Santorn, now issued as U.S. Pat. No. 7,173,977, which is a National Stage Application of PCT Application US03/32751, filed Oct. 15, 2003, which claims priority to Provisional Patent Application 60/421,333, entitled �METHOD AND APPARATUS FOR TAILORING CARRIER POWER REQUIREMENTS ACCORDING TO AVAILABILITY IN LAYERED MODULATION SYSTEMS,� filed Oct. 25, 2002, by Ernest C. Chen, Paul R. Anderson and Joseph Santoru, and which is a continuation-in-part of application Ser. No. 09/844,401, entitled �LAYERED MODULATION FOR DIGITAL SIGNALS,� filed on Apr. 27, 2001, by Ernest C. Chen, now issued as U.S. Pat. No. 7,209,524;
Techniques have been identified for modifying the basic modulated QPSK signal to higher order modulation techniques (e.g. 8PSK) to allow additional data to be transmitted and received by upgraded or second generation receivers. These techniques are also backwards-compatible. That is, they allow legacy receivers to receive and process the same basic QPSK signal essentially as if the additional data was not present. One such technique is hierarchical modulation. Hierarchical modulation is a technique where the standard 8PSK constellation is modified to create a �non-uniform� 8PSK constellation that transmits two signals (1) a QPSK signal that can be configured so as to be backwards-compatible with existing receivers, and (2) a generally more power efficient, non-backwards compatible signal . The backwards-compatible QPSK signal can be used to transmit high priority (HP) data, while the non-backwards-compatible signal can be used to transmit low priority (LP) data. While the HP signal is constrained to be the legacy signal, the LP signal has more freedom and can be encoded more efficiently using an advanced forward error correction (FEC) coding scheme such as a turbo code.
Hierarchical Modulation/Demodulation FIG. 1A is a diagram illustrating a signal constellation for a QPSK HP data signal. The signal constellation includes four possible signal outcomes 102 for A and B wherein {A,B}={0,0} (point 102A in the first quadrant), {1,0} (point 102B in the second quadrant), {1,1} (point 102C in the third quadrant), and {0,1} (point 102D in the fourth quadrant). An incoming and demodulated signal mapped to one of quadrants (I-IV) and the value for {A,B} (and hence, the value for the relevant portion of the HP data stream) is determined therefrom.
FIG. 1B is a diagram illustrating an 8PSK constellation created by addition of an LP data stream (represented by �C�). The application of hierarchical modulation adds two possible data values for �C� (C={1,0}) to each of the outcomes 102A-102D. For example, outcome 102A ({A,B}={0,0}) is expanded to an outcome pair 104A and 104A′ ({A,B,C}={0,0,1} and {0,0,0}), respectively, with the members of the pair separated by an angle θ from {A,B}. This expands the signal constellation to include 8 nodes 104A-104D (each shown as solid dots).
If the angle θ is small enough, a legacy QPSK signal will receive both {A,B,C}={0,0,1} and {0,0,0} as {A,B}={0,0}. Only receivers capable of performing the second hierarchical level of modulation (LP) can extract the value for {C} as either {0} or {1}. This hierarchical signal structure has been termed �non-uniform� 8PSK.
FIG. 2 is a diagram of an exemplary system for demodulating the hierarchically non-uniform 8PSK signal with Layer modulation, as described in FIG. 1B, with the {0,1,0,1,0,1,0,1} LP bit assignment discussed above. The input signal 202 is provided to a first demodulator 204, which demodulates the incoming signal to produce the HP data signal. The demodulated HP data signal is then provided to a symbol decoder, which maps the demodulated signal value to a symbol. In the exemplary non-uniform 8PSK signal illustrated in FIG. 1B, this typically is implemented by determining which of the four constellation quadrants (I-IV) the demodulated data signal is located. The output symbols are then provided to a forward error correction (FEC) decoder 210, which corrects at least some of the potentially erroneous signals from the symbol decoder 208. Such erroneous signals can occur, for example, when additive noise or distortion of the data places the measurement close enough to an incorrect quadrant. This process is functionally analogous to that which is performed by legacy QPSK receivers tasked with decoding the QPSK signal shown in FIG. 1A.
In a separate FEC-corrected demodulator 402 shown in FIG. 4, the system 400 can be implemented by providing the FEC corrected and re-encoded HP symbol stream from the output of re-encoder 302 back to signal 406, this time without symbol decision errors. Further, FIGS. 2-4 illustrate embodiments that can receive and demodulate coherent and non-coherent HP and LP data signals. If the HP and LP signals are coherent, as in the case of hierarchical non-uniform 8PSK, the systems shown in FIGS. 2-4 can be simplified by greatly reducing or eliminating the LP signal demodulator 216. Accordingly, the second demodulator 216 and second symbol decoder 220 are shown as a single block in FIG. 4.
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