Michael Bruce Hiatt

US Patent:

20050111579, May 26, 2005

Filed:

May 18, 2004

Appl. No.:

10/847944

Inventors:

Glenn Walker - Greentown IN, US
Eric Dibiaso - Kokomo IN, US
Michael Hiatt - Westfield IN, US

International Classification:

H04L027/20

US Classification:

375308000

Abstract:

The present invention provides a receiver for use in a SDAR system, the receiver including a receiving unit having satellite signal detection means for detecting a first transmit signal transmitted from a first communication satellite and a second transmit signal transmitted from a second communication satellite, the first transmit signal produced when the transmitter modulates a primary data stream with a secondary data stream on a first carrier wave associated with the first communication satellite and the second transmit signal produced when the transmitter modulates the primary and secondary data streams on a second carrier wave associated with the second communication satellite; and at least one demodulator coupled to the receiving unit and configured to demodulate the at least one of the first and the second transmit signals.

US Patent:

20050111580, May 26, 2005

Filed:

Sep 22, 2004

Appl. No.:

10/946657

Inventors:

Glenn Walker - Greentown IN, US
Eric Dibiaso - Kokomo IN, US
Michael Hiatt - Westfield IN, US

International Classification:

H04B001/69

US Classification:

375308000

Abstract:

The present invention involves a method and system for transmitting two levels of data in a hierarchical transmission schema. A first modulated signal is generated based on first input. A second modulation signal is generated based on a second input that has a data rate that is a fraction of the data rate of the first modulated signal. The second modulation signal has known instances where the second modulation signal has no energy. In a system where the first modulation is quadrature phase shift keying (QPSK), the second modulation signal can be a secondary phase offset. A receiver in the system that has a priori knowledge about the timing relationship between the first data signal and the instances when the second data signal is present will be able to detect both data signals optimally.

US Patent:

20050111581, May 26, 2005

Filed:

Sep 22, 2004

Appl. No.:

10/946678

Inventors:

Glenn Walker - Greentown IN, US
Eric Dibiaso - Kokomo IN, US
Michael Hiatt - Westfield IN, US

International Classification:

H04L005/12

US Classification:

375308000, 375261000

Abstract:

The present invention involves a transmitter for transmitting two levels of data in a hierarchical transmission system. The transmitter has encoders, a modulator, an adjuster, and an up converter. The first encoder has a first output and capable of providing digital information based on a first level of data on the first output. The second encoder has a second output and is capable of providing digital information based on a second level of data on the second output. The modulator is coupled to the first encoder and has I and Q outputs. The adjuster is coupled to the modulator and second encoder and modifies signals on the I and Q outputs of the modulator to produce transmission I and transmission Q outputs. The up converter is coupled to the adjuster and is capable of transmitting broadcast radio signals based on the transmission I and transmission Q outputs. The modulator may include a root raised cosine filter and/or a QPSK modulator. The I and Q outputs of the modulator include analog I and analog Q signals. The adjuster includes an inverter, a phase rotator circuit, a combiner, and/or a limiter. The transmission I and transmission Q outputs of the adjuster include analog I and analog Q signals.

US Patent:

20050113040, May 26, 2005

Filed:

Oct 27, 2004

Appl. No.:

10/974279

Inventors:

Glenn Walker - Greentown IN, US
Eric Dibiaso - Kokomo IN, US
Michael Hiatt - Westfield IN, US

International Classification:

H04B001/02
H04B001/66
H04B001/00
H04B001/16

US Classification:

455102000, 455132000, 455205000, 455272000

Abstract:

The present invention provides a method, receiver and transmitter for use in a SDAR system. The method involves generating a first modulated signal based on first input data. Additional modulation is superimposed on the first modulated signal based on additional input data, being spread across a plurality of symbols in the first modulated signal in a predetermined pattern to generate a modified signal which is then transmitted. The modified signal is decoded by performing a first demodulation of the first modulated signal then additional demodulation is performed to obtain additional input data. The superimposing step uses a plurality of offset sequence values to add the additional modulation to the first modulated signal. The offset sequence may appear as a pseudo-random distribution of offset sequence values, and may include at least one zero offset value. Alternatively, the additional modulated signal may be a fromed as a direct sequence spread spectrum modulation and the offset sequence appearing as a pseudo-noise distribution. A Hadamard matrix sequence may be used as the direct sequence code.

US Patent:

20050117669, Jun 2, 2005

Filed:

Nov 22, 2004

Appl. No.:

10/995721

Inventors:

Glenn Walker - Greentown IN, US
Eric Dibiaso - Kokomo IN, US
Michael Hiatt - Westfield IN, US

International Classification:

H04L027/10

US Classification:

375329000, 375279000

Abstract:

The present invention provides a receiver for use in a SDAR system, the receiver including a receiving unit having satellite signal detection means for detecting a transmit signal transmitted from a satellite, the transmit signal produced when the transmitter modulates a primary data stream with a secondary data stream on a carrier wave associated with the satellite; and at least one demodulator coupled to the receiving unit and configured to demodulate the transmit signal.

US Patent:

20050141627, Jun 30, 2005

Filed:

Nov 22, 2004

Appl. No.:

10/995946

Inventors:

Glenn Walker - Greentown IN, US
Eric Dibiaso - Kokomo IN, US
Michael Hiatt - Westfield IN, US

International Classification:

H04L005/16

US Classification:

375260000

Abstract:

The present invention involves a method for transmitting data using an orthogonal frequency division multiplex (OFDM) transmission system, such as over a terrestrial network used in satellite digital audio radio. A OFDM signal is generated based on first input data. A variation is introduced in the OFDM signal based on second input data to generate a modified OFDM signal which is transmitted. The modified OFDM signal is decoded by performing a demodulation of the modified OFDM signal then a first and second detection to obtain the first input data and the second input data. The introduction of a variance may include introducing an additional phase offset across adjacent OFDM sub-carriers, across adjacent OFDM symbols, an additional phase offset in the OFDM signal, an additional amplitude offset in the OFDM signal, an additional amplitude augmentation in the OFDM signal, and/or a second variation in the first OFDM signal based on third input data.

US Patent:

20060045140, Mar 2, 2006

Filed:

Sep 1, 2004

Appl. No.:

10/931665

Inventors:

Glenn Walker - Greentown IN, US
Eric Dibiaso - Kokomo IN, US
Michael Hiatt - Westfield IN, US

International Classification:

H04L 12/28
H04J 3/04

US Classification:

370529000, 370535000

Abstract:

The present invention generally relates to the transmission of digital data, and more particularly, to the transmission of digital data in a satellite digital audio radio (“SDAR”) system. In the SDAR system, there may be different types of required services. Some of these services may be considered high priority and others may be of a lower priority. Current SDAR systems have the same performance on all user data. Therefore, there is a need to vary the performance of different services. The present invention provides a method and apparatus for optimizing the throughput (i.e. information) in a digital transmission system by transmitting the different services with different performance levels. The present invention addresses the need in the art to vary the performance of different services (i.e., levels of data). Because the performance of the primary level of data will not be equal to the performance of the secondary level of data, the primary level will need to be further protected. The primary level data may be streaming data. The secondary level data does not need as much protection because it may be rebroadcast repeatedly. The easiest and most cost effective solution is to integrate multiple symbols for a secondary level bit. The present invention provides a method and apparatus in which the power level for the data levels can be set within each data packet using a message header providing the different services with different levels of performance.

US Patent:

20060276145, Dec 7, 2006

Filed:

Jun 26, 2006

Appl. No.:

11/474747

Inventors:

Glenn Walker - Greentown IN, US
Eric DiBiaso - Kokomo IN, US
Michael Hiatt - Westfield IN, US

International Classification:

H04B 1/02
H04B 1/66

US Classification:

455102000

Abstract:

The present invention provides a method of hierarchically modulating first and second digital data streams in a broadcast system such as an SDAR system that is compatible with legacy receivers. The second digital data stream, but not the first, is provided with a non-binary pseudo-random encoding. A carrier is first modulated, e.g. QPSK, by the first digital data stream; and a second modulation is performed with the encoded second digital data stream. The encoding includes a multiplication of a matrix formed of 2, 3 or 4 consecutive bits of the secondary data stream by a matrix, e.g. a Hadamard matrix to form a product matrix having non-binary values that are used to modify consecutive symbols of the first modulation. The second modulation appears as Gaussian noise to legacy receivers over time.