Robert A Molina

US Patent:

7630457, Dec 8, 2009

Filed:

Dec 18, 2003

Appl. No.:

10/739505

Inventors:

Robert J. Molina - Austin TX, US

Assignee:

Freescale Semiconductor, Inc. - Austin TX

International Classification:

H03K 9/00
H04L 27/00

US Classification:

375316, 375324

Abstract:

A receiver includes an input, a correlator, a phase-assisted demodulator, and an output. The input receives a modulated signal and the correlator generates a plurality of correlation values from the received modulated signal The phase-assisted demodulator, coupled to the correlator, selects one of the plurality of correlation values based on relative magnitude and relative phase information of at least a two of the plurality of correlation values. The output provides a demodulated signal, corresponding to the modulated signal, based on the selected one of the plurality of correlation values. The correlation value having the largest magnitude and the correlation value having the second largest magnitude is used in combination with the relative phase information of both correlation values in determining which correlation value corresponds to the correct demodulated symbol.

US Patent:

20040103359, May 27, 2004

Filed:

Nov 27, 2002

Appl. No.:

10/306071

Inventors:

Robert Molina - Austin TX, US

International Classification:

H03M013/00
G11C029/00

US Classification:

714/763000

Abstract:

An apparatus for dynamic real time generation of interleaver sequences for a decoder includes a vector memory () that stores a plurality of vectors (). Each vector () corresponds to a desired reordering of a matrix. A data memory () stores individual data elements () from a data stream () so that each data element () is stored in a different memory location in a predetermined order. An interleaver () circuit dynamically generates a plurality of interleaver elements (), each in response to a request signal () (being asserted and each pointing to a memory location. A MAP decoder () receives the interleaver elements () from the interleaver circuit and retrieves the data element () stored in a memory location pointed to by each interleaver element (). The MAP decoder () generates a reordered data stream () including the data elements () ordered in an arrangement corresponding to the sequence in which the interleaver elements () are received from the interleaver circuit.

US Patent:

20050079850, Apr 14, 2005

Filed:

Oct 12, 2004

Appl. No.:

10/963387

Inventors:

Weizhong Chen - Austin TX, US
Robert Molina - Austin TX, US

International Classification:

H04B001/26

US Classification:

455324000, 455323000

Abstract:

A method for removing direct current (DC) interference from a signal received by a communication receiver is provided that removes both a DC offset signal induced by the communication receiver and transmitter. The method includes removing the estimated DC offset from the received signal, correcting a frequency shift in the received signal, estimating a second DC offset signal induced by a source of the received signal, such as a transmitter and removing the estimated second DC offset from the received signal. The receiver DC offset signal is estimated and removed prior to performing a timing carrier offset correction using Barker code manipulation to remove receiver-induced DC offset interference and to sum all Barker chips after effectively multiplying Barker codes to correlate to a Barker sequence unaffected by the receiver DC offset signal.