Joseph F Cavallaro

US Patent:

7706430, Apr 27, 2010

Filed:

Feb 25, 2005

Appl. No.:

11/067498

Inventors:

Yuanbin Guo - Irving TX, US
Dennis McCain - Lewisville TX, US
Joseph R. Cavallaro - Pearland TX, US

Assignee:

Nokia Corporation - Espoo

International Classification:

H04L 27/06

US Classification:

375148, 375343, 375346, 375147, 370319, 370320, 370312

Abstract:

A system, apparatus and method for a multi-stage Parallel Residue Compensation (PRC) receiver for enhanced suppression of the Multiple Access Interference (MAI) in Code Division Multiple Access (CDMA) systems. The accuracy of the interference estimation is improved with a set of weights computed from an adaptive Normalized Least Mean Square (NLMS) algorithm. In order to reduce complexity, the commonality of the multi-code processing is extracted and used to derive a structure of PRC to avoid direct interference cancellation. The derived PRC structure reduces the interference cancellation architecture from a complexity that is proportional to the square of the number of users to a complexity that is linear with respect to the number of users. The complexity is further reduced by replacing dedicated multiplier circuits with simple combinational logic.

US Patent:

20060146759, Jul 6, 2006

Filed:

Jan 4, 2005

Appl. No.:

11/029900

Inventors:

Yuanbin Guo - Irving TX, US
Jianzhong Zhang - Irving TX, US
Dennis McCain - Lewisville TX, US
Joseph Cavallaro - Pearland TX, US

International Classification:

H04B 7/216

US Classification:

370335000

Abstract:

An apparatus and corresponding method for receiving a MIMO cellular communication signal, the apparatus including: a Kalman filter type of equalizer, responsive to a received signal, for providing a corresponding processed signal indicating information conveyed by the received signal, responsive to a set of values indicating predicted state error correlation at a first instant of time given all noise estimates up through the first instant, for providing ta set of values indicating a product of measurement values and predicted state error correlation at a later instant of time given all process noise estimates up through the later instant. The filter is implemented so as to make use of the displacement structure of the state transition matrix of the Kalman filter allowing shifting operations in place of vector and matrix multiplications. The filter typically includes a transition and common data path that provides to both a Kalman gain processor and a Riccati processor the set of values indicating a product of measurement values and predicted state error correlation at a later instant of time given all process noise estimates up through the later instant.

US Patent:

20090154600, Jun 18, 2009

Filed:

Dec 14, 2007

Appl. No.:

12/002017

Inventors:

Kyeong Jin Kim - Irving TX, US
Predrag Radosavljevic - Houston TX, US
Joseph R. Cavallaro - Pearland TX, US

International Classification:

H04L 27/06

US Classification:

375320, 375316

Abstract:

An apparatus includes a receiver configurable to receive signals from y pairs of antennas, where y is greater than one, and where the received signals convey coded bits of information. The apparatus further includes a detection block that includes a plurality of search modules configurable to process signals received from pairs of the antennas in parallel to find partial Euclidian distances and determine valid partial candidates for individual antennas; and a plurality of sort modules configurable to sort the valid partial candidates to find M best partial candidates to be combined into Mfinal candidates. The apparatus further includes a plurality of a posteriori probability function units arranged to process the Mfinal candidates in parallel, with corresponding final Euclidian distances, to determine a posteriori reliability information for coded bits. As an example, the signals are received from four antennas and are modulated using 16-QAM modulation. The apparatus may be embodied at least partially as an integrated circuit that provides a QRD-QLD detection algorithm as part of a wireless MIMO OFDM downlink receiver.