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| Method, system, and program for diagnosing a computer in a network system |
| OF THE PREFERRED EMBODIMENTS In the following description, reference is made to the accompanying ... |
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| Methods for quantitative analysis by tandem mass spectrometry |
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| Method for optimizing test development for digital circuits |
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System for turbo-coded satellite digital audio broadcasting
| Details |
Inventors: Yi, Byung Kwan;
Assignee: Orbital Sciences Corporation (Dulles, VA)
Primary Examiner: Tse; Young T.
Assistant Examiner:
Attorney, Agent or Firm: McDermott, Will & Emery
A system and method for broadcasting an audio signal in a turbo-coded satellite digital audio broadcasting system is provided that utilizes the combination of a turbo coding system having code combining and code diversity techniques to lower the power required for transmittal and to transmit at a higher code rate of 1/4 by utilizing the puncturing sequence and a pilot signal assisted orthogonal CDMA; the invention includes an improved receiver system that uses modified RAKE receivers in order to mitigate the Rayleigh multipath fading, shadowing, and temporal blockage and improve performance. The invention further uses a terrestrial gap filler network having a reduced amount of gap fillers. |
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DETAILED DESCRIPTION It is an object of the present invention to provide an improved DAB method and system using an implementation of turbo code over two complementary satellite links in the DAB system to allow the reduction of the satellite transmitter output power.
It is an object of the present invention to increase the coverage area with a minimum number of gap fillers using the high coding gain of the turbo code.
Another object of the present invention is to provide code diversity at a code rate of 1/2 coupled with packet combining to result in an overall system code rate of 1/4.
A code diversity scheme, coupled with a code combining scheme advantageously provides improved performance through very high coding gain, allows the reduction of transponder output power, and provides seamless service over the coverage area with a minimum number of required gap fillers.
Code diversity and packet combining are used to mitigate Rayleigh multipath fading, shadowing, and temporal blockage.
Yet another object of the present invention is to provide a DAB system using a synchronous Orthogonal Code Division Multiple Access (OCDMA) scheme for DAB applications, e.
g.
CD Quality Radio, messaging transmission and Internet download server, so as to completely eliminate self interference from other audio channels encountered with the use of a conventional CDMA system.
Another object of the present invention is to provide a DAB system having dual RAKE receivers, arranged whereby one RAKE receiver is used to combine the satellite, gap filler, and multipath signals associated with each of two complementary satellite data streams.
It is a further object of the present invention to provide high powered pilot channels to assist the receiver to acquire synchronization of the signals from multiple satellites and gap filler transmitters.
Finally, the present invention can provide advantageously a terrestrial gap filler network for retransmission of the uplinked satellite signals in areas where there is a high probability that signals from both satellites might be blocked, with proper built-in signal propagation delay to compensate for the signal delay through the satellite path
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