Source: http://www.google.com.hk/patents/US7423987
Timestamp: 2013-05-25 16:36:39
Document Index: 117508430

Matched Legal Cases: ['Application No. 60', 'Application No. 2502924', 'Application No. 2491259', 'Application No. 03757359', 'Application No. 03794510', 'Application No. 10', 'Application No. 042562343', 'Application No. 03777694', 'Application No. 03774848', 'Application No. 03777627', 'Application No. 02728894', 'Application No. 07075745', 'Application No. 2004', 'Application No. 20026115', 'art 1', 'Application No. 092129629']

�M�Q US7423987 - Feeder link configurations to support layered modulation for digital signals - Google �M�Q�j�M �Ϥ� �a�� Play YouTube �s�D Gmail ���ݵw�� ��h »�i���M�Q�j�M | �������� | �n�J�i���M�Q�j�M�M�QSystems and methods are disclosed for feeder link configurations to layered modulation. One feeder link system employs feeder link spot beam to antennas in distinct coverage areas to enable frequency reuse. Another system employs narrow beam width feeder link antenna to illuminate individual satellites...http://www.google.com.hk/patents/US7423987?utm_source=gb-gplus-share�M�Q US7423987 - Feeder link configurations to support layered modulation for digital signals���}��US7423987 B2�X���������v�ӽЮѽs��10/532,631�o�G���2008�~9��9���ӽФ��2003�~10��20�� �u���v���2001�~4��27����L���}�M�Q��US8259641US20060056330US20090073917�o��HPaul R. AndersonErnest C. ChenJoseph Santoru��M�Q�v�HThe Directv Group, Inc.Directv Group, Inc., The ���M�Q������370/316370/337370/322455/427370/328375/320332/103375/327455/428455/429329/304455/431370/321375/316370/319348/E07.93��ڱM�Q������H04B7/185 �X�@����H04N7/20H04B7/18526 �ڬw������H04N7/20�ѦҤ��m�M�Q�ޥ� (108)�D�M�Q�ޥ� (65)�Q�H�U�M�Q�ޥ� (3)�~���s�����M�Q�ӼЧ� ���M�Q�ӼЧ��M�Q����T�� �ڬw�M�Q��Feeder link configurations to support layered modulation for digital signalsUS 7423987 B2�K�n Systems and methods are disclosed for feeder link configurations to layered modulation. One feeder link system employs feeder link spot beam to antennas in distinct coverage areas to enable frequency reuse. Another system employs narrow beam width feeder link antenna to illuminate individual satellites also enabling frequency reuse. Yet another system uses layered modulation in the feeder link. Another feeder link system employs a higher order synchronous modulation for the satellite feeder link than is used in the layered modulation downlink signals.
20. The method of claim 11, wherein the upper layer signal and the lower layer signal are non-coherent. ����
CROSS-REFERENCE TO RELATED APPLICATIONS This application is the national phase under 35 U.S.C. �� 371 of PCT International Application No. PCT/US03/33255 which has an International filing date of 20 Oct. 2003, which designated the United States of America.
This application claims the benefit of U.S. Provisional Patent Application No. 60/421,328, entitled ��FEEDER LINK CONFIGURATIONS TO SUPPORT LAYERED MODULATION FOR DIGITAL SIGNALS,�� by Paul R. Anderson et al., filed Oct. 25, 2002.
U.S. Utility application Ser. No. 09/844,401, filed April 27, 2001, by-Ernest C. Chen, entitled ��LAYERED MODULATION FOR DIGITAL SIGNALS,�� now issued as U.S. Pat. No. 7,209,524.
U.S. Utility application Ser. No. 10/305,490, filed Nov. 26, 2002, by Patrick J. Loner, entitled ��SYSTEMS AND METHODS FOR SHARING UPLINK BANDWIDTH AMONG SATELLITES IN A COMMON ORBITAL SLOT.��
application Ser. No. 10/165,710, entitled ��SATELLITE TWTA ON-LINE NONLINEARITY MEASUREMENT,�� filed on Jun. 7, 2002, by Ernest C. Chen, 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. 10/236,414, entitled ��SIGNAL INTERFERENCE AND NOISE POWER MEASUREMENT,�� filed on Sep. 6, 2002, by Ernest C. Chen and Chinh Tran, 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. 10/693,135, entitled ��LAYERED MODULATION FOR ATSC APPLICATIONS,�� filed on Oct. 24, 2003, by Ernest C. Ohm, which claims benefit to Provisional Patent Application 60/421,327, filed Oct. 25, 2002 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. 10/9 13,927, entitled ��CARRIER TO NOISE RATIO ESTIMATIONS FROM A RECEIVED SIGNAL,�� filed on Aug. 5, 2004, by Ernest C. Chen, 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. Number 11/619,173, entitled ��PREPROCESSING SIGNAL LAYERS IN LAYERED MODULATION DIGITAL SIGNAL SYSTEM TO USE LEGACY RECEIVERS,�� filed Jan. 2, 2007, which is a continuation of application Ser. No. 10/068,039, entitled ��PREPROCESSING SIGNAL LAYERS IN LAYERED MODULATION DIGITAL SIGNAL SYSTEM TO USE LEGACY RECEIVERS,�� filed on Feb. 5, 2002, by Ernest C. Chen, Tiffany S. Furuya, Philip R. Hilmes, and Joseph Santoru now issued as U.S. Pat. No. 7,245,671, 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. 10/691,032, entitled ��UNBLIND EQUALIZER ARCHITECTURE FOR DIGITAL COMMUNICATION SYSTEMS,�� filed on Oct. 22, 2003, by Weizheng W. Wang, Tung-Sheng Lin, Ernest C. Chen and William C. Lindsey. which claims priority to Provisional Patent Application Ser. No. 60/421,329, filed Oct. 25, 2002, 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. 10/962,346, entitled ��COHERENT AVERAGING FOR MEASURING TRAVELING WAVE TUBE AMPLIFIER NONLINEARITY,�� filed on Oct. 8, 2004, by Ernest C. Chen which claims priority to Provisional Patent Application Ser. No. 60/510,368, filed Oct. 20, 2003, and which is a continuation-in-part of application Ser. No. 09/814,401, entitled ��LAYERED MODULATION FOR DIGITAL SIGNALS,�� filed on Apr. 27, 2001, by Ernest C. Chen, now issued as US. Pat. No. 7,209,524;
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 Lin, 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 Lin, 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. 11/656,662, entitled ��EQUALIZERS FOR LAYERED MODULATION AND OTHER SIGNALS,�� filed on Jan. 22, 2007, by Ernest C. Chen, Tung-Sheng Lin, Weizheng W. Wang, and William C. Lindsey which claims priority to Provisional Patent Application 60/421,241, filed Oct. 25, 2002, and which is a continuation of application Ser. No. 10/691,133, entitled ��EQUALIZERS FOR LAYERED MODULATED AND OTHER SIGNALS,�� filed on Oct. 22, 2003, by Ernest C. Chen, Tung-Sheng Lin, Weizheng W. Wang, and William C. Lindsey, now issued as U.S. Pat. No. 7,184,473, 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. 10/5 32,632, 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 Joseph 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 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;
application Ser. No. 10/532,619, entitled ��MAXIMIZING POWER AND SPECTRAL EFFICIENCIES FOR LAYERED AND CONVENTIONAL MODULATIONS,�� filed on Apr. 25, 2005, by Ernest C. Chen, which is a National Phase Application of PCT Application US03/32800, filed Oct. 16, 2003, which claims priority to Provisional Patent Application 60/421,288, entitled ��MAXIMIZING POWER AND SPECTRAL EFFICIENCIES FOR LAYERED AND CONVENTIONAL MODULATION,�� filed Oct. 25, 2002, by 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. 20/532,509, entitled ��ESTIMATING THE OPERATING POINT ON A NONLINEAR TRAVELING WAVE TUBE AMPLIFIER,�� filed on Apr. 25, 2005, by Ernest C. Chen and Shamik Maitra, now issued as U.S. Pat. No. 7,230,480, which is a National Stage Application of PCT Application US03/33130 filed Oct. 17, 2003, and which claims priority to Provisional Patent Application 60/421,289, entitled ��ESTIMATING THE OPERATING POINT ON A NONLINEAR TRAVELING WAVE TUBE AMPLIFIER,�� filed Oct. 25, 2002, by Ernest C. Chen and Shamik Maitra, 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. 10/519,322, entitled ��IMPROVING HIERARCHICAL 8PSK PERFORMANCE,�� filed on Dec. 23,2004 by Ernest C. Chen and Joseph Santoru, which is a National Stage Application of PCT US03/020862 filed Jul. 1, 2003, which claims priority to Provisional Patent Application 60/392,861, filed Jul. 1, 2002 and Provisional Patent Application 60/392,860, filed Jul. 1, 2002, and which is also related to 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. 10/519,375, entitled ��METHOD AND APPARATUS FOR LAYERED MODULATION,�� filed on Jul. 3, 2003, by Ernest C. Chen and Joseph Santoru, which is a National Stage Application of PCT US03/20847, filed Jul. 3, 2003, which claims priority to Provisional Patent Application 60/393,437 filed Jul. 3, 2002, and which is related to 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. 10/692,539, entitled ��ON-LINE PHASE NOISE MEASUREMENT FOR LAYERED MODULATION��, filed Oct. 24, 2003, by Ernest C. Chen, which claims priority front Provisional Patent Application 60/421,291, filed Oct. 25, 2002, entitled ��ON-LINE PHASE NOISE MEASUREMENT FOR LAYERED MODULATION��; and
SUMMARY OF THE INVENTION The present invention provides four distinct techniques that can be employed to support the use of layered modulation on a satellite downlink (See U.S. Utility application Ser. No. 09/844,401). Satellite communications bands are almost always allocated in pairs of substantially equal bandwidth�Xa feeder link (i.e. uplink) bandwidth and a corresponding downlink bandwidth. For example, in the case of the broadcasting satellite service (BSS) in one region, the feeder link is allocated at 17.3 to 17.8 GHz, and the corresponding downlink is allocated at 12.2 to 12.7 GHz.
FIG. 4 is a block diagram showing one embodiment of the modulator 220. The modulator 220 optionally comprises a forward error correction (FEC) encoder 404 which accepts the first signal symbols 402 and adds redundant information that are used to reduce transmission errors. The coded symbols 405 are modulated by modulator 406 according to a first carrier 408 to produce an upper layer modulated signal 410. Second symbols 420 are likewise provided to an optional second FEC encoder 422 to produce coded second symbols 422. The coded second symbols 422 are provided to a second modulator 414, which modulates the coded second signals according to a second carrier 416 to produce a lower layer modulated signal 418. The resulting signals are then transmitted by one or more transmitters 420, 422. The upper layer modulated signal 410 and the lower layer modulated signal 418 are therefore uncorrelated, and the frequency range used to transmit each layer can substantially or completely overlap the frequency spectrum used to transmit the other. For example, as shown in FIG. 4, the frequency spectrum ƒ1��ƒ3 432 of the upper layer signal 410 may overlap the frequency spectrum ƒ2��ƒ4 434 of the lower layer signal 418 in frequency band ƒ2��ƒ3 436. The upper layer signal 410, however, must be a sufficiently greater amplitude signal than the lower layer signal 418, in order to maintain the signal constellations shown in FIG. 6 and FIG. 7. The modulator 220 may also employ pulse shaping techniques (illustrated by pulse p(t) 430) to account for the limited channel bandwidth. Although FIG. 4 illustrates the same pulse shaping p(t) 430 being applied to both layers, different pulse shaping can be applied to each layer as well.
A description of the processes performed in the encoding and decoding of video streams, particularly with respect to MPEG and JPEG encoding/decoding, can be found in Chapter 8 of ��Digital Television Fundamentals,�� by Michael Robin and Michel Poulin, McGraw-Hill, 1998, which is hereby incorporated by reference herein.
The microcontroller 510 receives and processes command signals from a remote control, an IRD 500 keyboard interface, and/or other suitable input device 524. The microcontroller 510 receives commands for performing its operations from a processor programming memory, which permanently stores such instructions for performing such commands. The processor programming memory may comprise a read only memory (ROM) 538, an electrically erasable programmable read only memory (EEPROM) 522 or, similar memory device. The microcontroller 510 also controls the other digital devices of the IRD 500 via address and data lines (denoted ��A�� and ��D�� respectively, in FIG. 5).
Layered modulation applications include backwards compatible and non-backwards compatible applications. ��Backwards compatible�� in this sense, describes systems in which legacy receivers 500 are not rendered obsolete by the additional signal layer(s). Instead, even if the legacy receivers 500 are incapable of decoding the additional signal layer(s), they are capable of receiving the layered modulated signal and decoding the original signal layer. In these applications, the pre-existing system architecture is accommodated by the architecture of the additional signal layers. ��Non-backwards compatible�� describes a system architecture which makes use of layered modulation, but the modulation scheme employed is such that pre-existing equipment is incapable of receiving and decoding the information on additional signal layer(s).
s UL ⁡ ( t ) = f U ⁡ ( M U ⁢ ⁢ exp ⁡ ( j�s U ⁢ t + �c U ) ⁢ ∑ m = - �� �� ⁢ ⁢ S Um ⁢ p ⁡ ( t - mT ) ) + f L ⁡ ( M L ⁢ exp ⁡ ( j�s L ⁢ t + �c L ) ⁢ ∑ m = - �� �� ⁢ ⁢ S Lm ⁢ p ⁡ ( t - mT + �G ⁢ ⁢ T m ) ) + n ⁡ ( t ) where, MU is the magnitude of the upper layer QPSK signal and ML is the magnitude of the lower layer QPSK signal and ML<<MU. The signal frequencies and phase for the upper and lower layer signals are respectively �sU,�cU and �sU,�cU. The symbol timing misalignment between the upper and lower layers is �GTm. p(t−mT) represents the time shifted version of the pulse shaping filter p(t) 414 employed in signal modulation. QPSK symbols SUm and SLm are elements of
{ exp ⁡ ( j ⁢ n�k 2 ) , n = 0 , 1 , 2 , 3 } . ƒU(•) and ƒL(•) denote the distortion function of the TWTAs for the respective signals.
s UL �� ⁡ ( t ) = M U ⁢ ∑ m = - �� �� ⁢ ⁢ S Um ⁢ p ⁡ ( t - mT ) + M L ⁢ ⁢ exp ⁢ { j ⁡ ( �s L - �s U ) ⁢ t + �c L - �c U } ⁢ ∑ m = - �� �� ⁢ ⁢ S Lm ⁢ p ⁡ ( t - mT + �G ⁢ ⁢ T m ) Because of the magnitude difference between MU and ML, the upper layer decoder 402 disregards the ML component of the s��UL(t).
S L ⁡ ( t ) = M L ⁢ ⁢ exp ⁢ { j ⁡ ( �s L - �s U ) ⁢ t + �c L - �c U } ⁢ ∑ m = - �� �� ⁢ ⁢ S Lm ⁢ p ⁡ ( t - mT + �G ⁢ ⁢ T m ) Any distortion effects, such as TWTA nonlinearity effects are estimated for signal subtraction. In a typical embodiment of the present invention, the upper and lower layer frequencies are substantially equal. Significant improvements in system efficiency can be obtained by using a frequency offset between layers.
As previously discussed the present invention may also be used in ��non-backward compatible�� applications. In a first example embodiment, two QPSK layers 1104, 1110 are used each at a code rate of 2/3. The upper QPSK layer 504 has a CNR of approximately 4.1 dB above its noise floor 1106 and the lower QPSK layer 1110 also has a CNR of approximately 4.1 dB. The total code and noise level of the lower QPSK layer 1110 is approximately 5.5 dB. The total CNR for the upper QPSK signal 1104 is approximately 9.4 dB, merely 2.4 dB above the legacy QPSK signal rate 6/7. The capacity is approximately 1.74 compared to the legacy rate 6/7.
In one embodiment, instructions implementing the operating system 1208, the computer program 1210, and the compiler 1212 are tangibly embodied in a computer-readable medium, e.g., data storage device 1220, which could include one or more fixed or removable data storage devices, such as a zip drive, floppy disc drive 1224, hard drive, CD-ROM drive, tape drive, etc. Further, the operating system 1208 and the computer program 1210 are comprised of instructions which, when read and executed by the computer 1202, causes the computer 1202 to perform the steps necessary to implement and/or use the present invention. Computer program 1210 and/or operating instructions may also be tangibly embodied in memory 1206 and/or data communications devices 1230, thereby making a computer program product or article of manufacture according to the invention. As such, the terms ��article of manufacture,�� ��program storage device�� and ��computer program product�� as used herein are intended to encompass a computer program accessible from any computer readable device or media.
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