Source: http://www.google.com/patents/US7483505?dq=inassignee:Temic
Timestamp: 2015-04-26 04:02:33
Document Index: 191545740

Matched Legal Cases: ['Application No. 60', 'Application No. 2502924', 'Application No. 2503532', 'Application No. 2515167', 'Application No. 2503530', 'Application No. 2487817', 'Application No. 2484313', 'Application No. 2442400', 'Application No. 2491259', 'Application No. 200410100591', 'Application No. 03757359', 'Application No. 03794510', 'Application No. 04256234', 'Application No. 03742400', 'Application No. 03777694', 'Application No. 03742393', 'Application No. 03742393', 'Application No. 03774848', 'Application No. 02728894', 'Application No. 07075745', 'Application No. 2004', 'Application No. 20026115', 'art 1', 'Application No. 092129629']

This application claims benefit of U.S. Provisional Patent Application No. 60/421,329, entitled �INNOVATIVE UNBLIND EQUALIZER ARCHITECTURE FOR DIGITAL COMMUNICATION SYSTEMS,� Weizheng Wang, Tung-Sheng Lin, Ernest C. Chen, and William C. Lindsey, filed Oct. 25, 2002, which application is hereby incorporated by reference herein.
Application Ser. No. 09/844,401, filed Apr. 27, 2001, now U.S. Pat. No. 7,209,524 by Ernest C. Chen, entitled �LAYERED MODULATION FOR DIGITAL SIGNALS�.
Application Ser. No. 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. 10/693,421, entitled �FAST ACQUISITION OF TIMING AND CARRIER FREQUENCY FROM RECEIVED SIGNAL,� flied on Oct. 24, 2003, by Ernest C. Chen, now issued as U.S. Pat. No. 7,151,807, which claims priority to Provisional Patent Application Ser. No. 60/421,292, 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. 10/692,491, entitled �ONLINE OUTPUT MULTIPLEXER FILTER MEASUREMENT,� filed on Oct. 24, 2003, by Ernest C. Chen, which claims priority to Provisional Patent Application 60/421,290, 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. 11/655,001, entitled �AN OPTIMIZATION TECHNIQUE FOR LAYERED MODULATION,� flied 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. 10/532,632, 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 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. 10/532,631, entitled �FEEDER LINK CONFIGURATIONS TO SUPPORT LAYERED MODULATION FOR DIGITAL SIGNALS,� filed on Apr. 25, 2005, by Paul R. Anderson, Joseph Santoru 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,� flied Oct. 25, 2002, by Paul R. Anderson, Joseph Santoru 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. 10/532,509, entitled �ESTIMATING THE OPERATING POINT ON A NONLINEAR TRAVELING WAVE TUBE AMPLIFIER,� filed on Apr. 25, 2005, by Ernest C. Chen and Sharmik 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 an 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; and
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 from Provisional Patent Application 60/421,291, filed Oct. 25, 2002, entitled �ON-LINE PHASE NOISE MEASUREMENT FOR LAYERED MODULATION�.
Equalizers are widely used in communication systems, and are particularly useful when there are multipath and/or other distortion effects in the transmission channel. Equalizers can also be used to cancel �echo� in the system. However, such equalizers typically require apriori knowledge of the channel impulse response, or knowledge of a pre-determined training sequence that is transmitted in the channel. Since the training sequence is known, the channel impulse response can be determined from the training sequence and appropriately equalized. Blind equalizers, which do not have apriori knowledge of the channel impulse response or knowledge of the pre-determined training sequence, are known, but such equalizers typically exhibit poor performance.
The microcontroller 510 receives and processes command signals from the remote control 524, an IRD 500 keyboard interface, and/or another input device. The microcontroller 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).
In a typical backwards-compatible embodiment of the present invention, the legacy QPSK signal is boosted in power to a higher transmission (and reception) level. This creates a power �room� in which a new lower layer signal may operate. The legacy receiver will not be able to distinguish the new lower layer signal, from additive white Gaussian noise, and, thus, operates in the usual manner. The optimum selection of the layer power levels is based on accommodating the legacy equipment, as well as the desired new throughput and services.
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).
As previously discussed the present invention may also be used in �non-backward compatible� applications. In a first exemplary embodiment, two QPSK layers 1104, 1110 are used each at a code rate of 2/3. The upper QPSK layer 1104 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.
�Unblind� Equalization
The performance of the IRD 500 can be improved by use of equalizers. Equalizers can be classified into two groups: those that either know or estimate the channel impulse response, and those that operate without such knowledge. Such equalizers can be found in the paper �Adaptive Equalizer� by Qureshi, Proceedings of IEEE, Vol. 73, No. 9, September 1985, and in the textbook �Digital Communications,� by John G. Proakis, Third Edition, McGraw-Hill Book Company, 1995, in Chapters 10 and 11.
The �unblind� equalizer described below does not fall neatly into any of the above categories. Unlike the first category, no apriori knowledge of the transmission channel characteristics is required, and prearranged training sequences are not required, thus saving valuable transmission capacity. The �unblind� equalizer has the same implementation advantages as a blind equalizer, and provides performance similar to that However, the unblind equalizer does not require specific knowledge of the channel impulse response, nor does it need to dedicate transmission capacity to transmit training sequences. The unblind equalizer uses past received data to recover the transmission signal and then uses the recovered transmission signal to define the equalizer format and parameters.
To an extent, the foregoing technique assumes that the transmission channel is wide-sense stationary or at least has characteristics that vary slowly over time, at least as compared to the digital detection process of the receiver 500. The effectiveness of the foregoing technique is reduced in situations where channel variances over time are not smaller than those of the equalizer parameter update. The foregoing technique also assumes that even without equalization, the receiver can detect the transmitted digital information or a portion thereof at a certain range of data error rate. This may not be the case when this �unblind� equalization technique is combined for use with traditional training sequence equalizers or blind equalizers.
In one embodiment, instructions implementing the operating system 1908, the computer program 1910, and the compiler 1912 are tangibly embodied in a computer-readable medium, e.g., data storage device 1920, which could include one or more fixed or removable data storage devices, such as a zip drive, floppy disc drive 1924, hard drive, CD-ROM drive, tape drive, etc. Further, the operating system 1908 and the computer program 1910 are comprised of instructions which, when read and executed by the computer 1902, causes the computer 1902 to perform the steps necessary to implement and/or use the present invention. Computer program 1910 and/or operating instructions may also be tangibly embodied in memory 1906 and/or data communications devices 1930, 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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