Agere Systems Inc.

Lsi Corporation

Avago Technologies General IP (Singapore) Pte. Ltd.

Eliahou Arviv

Daniel Briker

Gennady Zilberman

Xiao-an Wang

Alexander Rabinovitch

Leonid Dubrovin

Rafael Carmon

Moshe Bukris

Yi-Chen Li

Simon Issakov

Oliver Ridler

Gil Naveh

Yitzhak Casapu

Robert L Lang

An apparatus generally having a first circuit and a second circuit is disclosed. The first circuit may be configured to generate (i) a plurality of first code bits in response to an index value and (ii) a plurality of first intermediate bits in response to the index value. The first code bits may be generated in parallel with the first intermediate bits. The second circuit may be configured to generate a plurality of second code bits in response to all of (i) the index value, (ii) the first code bits and (iii) the first intermediate bits. A combination of the first code bits and the second code bits generally forms one of a plurality of orthogonal codes.

Orthogonal variable spreading factor code sequence generation

In one embodiment, a method for demodulating and searching for a preamble signal containing a complex phasor signal is disclosed. The complex phasor is demodulated using a phasor-rotated fast transformer. A received signal is correlated with a spreading code to produce a correlated signal. The correlated signal is coherently accumulated to produce a coherently accumulated signal. A first phasor-rotated signal transformation is performed on a real component of the coherently accumulated signal, and a second phasor-rotated signal transformation is performed on an imaginary component of the coherently accumulated signal. Finally, the signal power of the transformed real and imaginary components of the coherently accumulated signal is determined.

Technique for searching for a preamble signal in a spread spectrum using a fast hadamard transform

A method of detecting received data in a communication system includes the steps of: performing a QR decomposition on a received input vector as a function of one or more characteristics of a communication channel over which the input vector was transmitted; generating a subset of best symbol candidates from a symbol constellation by comparing an input sample (corresponding to an element of the input vector) with one or more prescribed thresholds; identifying at least one symbol satisfying prescribed minimum Euclidian distance criteria among multiple ambiguity symbols in the subset of best symbol candidates; and generating a subset of best symbols including a prescribed number of symbols from the symbol constellation determined to be closest to the input sample. The subset of best symbols is used in a subsequent iteration of the steps of generating the subset of best symbol candidates and identifying at least one symbol satisfying the prescribed minimum Euclidian distance criteria.

[object Object]

In one embodiment, a method for signal processing is provided that uses an improved inversion to mitigate the imprecision introduced by fast approximate methods for division. An input signal is received and processed to generate a matrix M. The matrix M is inverted to generate an inverted matrix M. Matrix M is inverted by (i) decomposing the matrix M into a plurality of first sub-matrices, (ii) generating, based on the first sub-matrices and without any division operations, numerators for a plurality of second sub-matrices of the inverted matrix M, (iii) generating, based on the first sub-matrices and without any division operations, denominators for the second sub-matrices, and (iv) generating the second sub-matrices based on the numerators and denominators. The inverted matrix Mis processed to generate an output signal. Accordingly, a reduction in noise level from inaccuracy in division is achieved, and computational complexity is reduced.

Signal processing using modified blockwise analytic matrix inversion

Technique for searching for a preamble signal in a spread spectrum signal using a fast Hadamard transform

In one embodiment, a receiver including one or more signal-processing blocks and a hardware-based matrix co-processor. The one or more signal-processing blocks are adapted to generate a processed signal from a received signal. The hardware-based matrix co-processor includes two or more different matrix-computation engines, each adapted to perform a different matrix computation, and one or more shared hardware-computation units, each adapted to perform a mathematical operation. At least one signal-processing block is adapted to offload matrix-based signal processing to the hardware-based matrix co-processor. Each of the two or more different matrix-computation engines is adapted to offload the same type of mathematical processing to at least one of the one or more shared hardware-computation units.

Hardware matrix computation for wireless receivers

In one embodiment, a method for determining whether an encoded message in a shared channel is not intended for a communications device. The method includes: (a) decoding the message to recover a multi-bit codeword; (b) determining whether the codeword is valid or invalid, wherein, if the codeword is determined to be invalid, then the encoded message is not intended for the communications device; and (c) if the codeword is determined to be valid, then performing one or more other steps of the method to determine whether the encoded message in the shared channel is not intended for the communications device.

Reducing false detection in an HSDPA 3G terminal

Growing community of inventors

Modiin, Israel

Eliahou Arviv