Freescale Semiconductor,inc.

Chengke Sheng

Christopher P Thron

T Keith Blankenship

Chris P Thron

Ivra Leon Turner

A technique of operating a wireless communication device includes receiving, at a first wireless communication device, respective signals transmitted from multiple second wireless communication devices. Respective channel matrix blocks for each block of the received respective signals are then generated. Finally, respective channel equalizer matrix blocks for each of the respective channel matrix blocks are generated. At least one of the respective channel equalizer matrix blocks is generated without performing a matrix inversion operation on an associated one of the respective channel matrix blocks.

Techniques for frequency-domain joint detection in wireless communication systems

A system and method for performing vector arithmetic is disclosed. The method includes loading two operand vectors, each composed of a number of vector elements, into two storage locations. A selected arithmetic operation is performed on the operand vectors to produce a result vector having the number of vector elements. Each vector element of the result vector is associated with an arithmetic logic cell that has a first input that can receive any vector element from the first vector and a second input that can receive any vector element from the second vector. Accordingly each vector element of the result vector is a function of any two individual vector elements of the operand vectors. By applying the operand vector elements to the appropriate arithmetic logic cells, and by selecting the appropriate arithmetic operation, complex vector operations can be performed efficiently.

Data processor and methods thereof

An X-Y, base-band receiver for code-division multiple accessing ('CDMA') is used at both base station and mobile station. The signal transmitted from a transmitter carries serial information symbols. Signals from all transmitters pass through a multi-path fading channel before they are received by the X-Y receiver. There is more than one instance of each symbol. The X-Y receiver searches for all instances of each symbol and combines all instances.

Chip rate base band receiver processor which receives digital information containing symbol information

A method of and data processing system for determining whether a received signal in a Code Division Multiple Access system that uses an antenna array includes a desired signal with a predetermined timing offset, the method including correlatingthe received signal with a spreading code having the predetermined timing offset and corresponding to the desired signal at each element of the antenna array to provide correlations; determininga power distribution, such as a DFT, corresponding to the correlations that is a function of a direction of arrival of the received signal; comparinga magnitude of the power distribution at a first direction of arrival to a threshold that has a value that varies with the direction of arrival; and when the threshold is satisfied, determiningor indicating that the desired signal is likely present at the first direction of arrival.

Method and apparatus for determining whether a received signal includes a desired signal

A method of channel estimation in a Code Division Multiple Access (CDMA) transmission system that incorporates Pilot Symbol Assisted Modulation (PSAM) using an iterative coherent detection method to estimate the phase and frequency of the received pilot symbols. Arctangent calculations are used to estimate phase and frequency. An iterative least squares linearization identifies and corrects values of the arctangent associated with an incorrect 2&#x3c0; alias, which arise due to the multiple-valued nature of the arctangent function. An alternative non-iterative least squares linearization also corrects the arctangent values, based on a calculation involving stored values of the pilot symbols.

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Austin, TX, United States of America

Chengke Sheng