Motorola Corporation

Motorola Solutions, Inc.

General Instrument Corporation

Cirrus Logic Inc.

Zhuan Ye

David P Gurney

Anthony R Schooler

Qicai Shi

Spyros Kyperountas

Neiyer S Correal

Yun H Kim

Joel W Page

William John Rinderknecht

Richard DiColli

Trenton John Grale

Benson Chau

Erng Sing Wee

Sumant Sathe

Alan Bok

Sijiam Chen

A method, wireless controller, and information processing system are provided to dynamically allocate spectrum sensing resources. A first input () including available sensing session time for performing spectrum sensing with respect to one or more primary systems () is received. A second input () including a set of communication channels to be monitored in the spectrum sensing session is received. A third input () including detection constraints associated with a plurality of available sensing nodes () in a secondary network () for performing the spectrum sensing is received. Spectrum sensing resources are dynamically allocated () among a set of the plurality of available sensing nodes () based on the first (), second (), and third inputs ().

Dynamic allocation of spectrum sensing resources in cognitive radio networks

A cognitive radio wireless device () dynamically manages signal detection in a cognitive radio system (). Spectrum sensing is performed for a first sensing frame on at least one communication channel. At least one observed signal is received () on the at least one communication channel. A detection decision () is performed to determine if the observed signal is noise or an active signal associated with an active user. The detection decision () is performed by comparing observed signal energy estimation with a current detection threshold. The current detection threshold can be an arbitrarily defined threshold or a detection threshold based on a previous detection decision for a sensing frame immediately prior to the first sensing frame.

Signal detection in cognitive radio systems

A method for improving burst acquisition in a receiver includes receiving a signal, and performing a sync word search on the signal, wherein the sync word search includes performing a hybrid synchronization technique, the hybrid synchronization technique including both a lower order modulation (e.g., BPSK) detection and correlation process and a higher order modulation (e.g., QPSK) detection and correlation process.

Method and apparatus for improved burst acquisition in a digital receiver

A digital modulator having a sample rate converter that does not require that the final output sampling rate, F, of the sample rate converter be at least twice as great as the input sampling rate, F, of the sample rate converter. The upsampling interpolation filter stages of the sample rate converter of the invention do not require any reference clocks to be provided by the NCO of the sample rate converter. Therefore, the upsampling interpolation filter stages are decoupled from the final output sampling rate, F. The interpolation algorithms may be implemented in software, hardware, or a combination of software and hardware. In addition, the polynomial-based interpolator of the Farrow Structure of the invention is capable of using an even or odd number of basepoints.

Method and apparatus for performing sample rate conversion

A low power programmable digital filter integrated circuit architecture has a programmable front end servicing up to 4 digital sources. Changing the programming of the front end permits digital outputs from different sensor types to be accommodated. Digital filtering is accomplished using a digital signal processor that is programmable to accommodate different decimation ratios. A serial data output register receives the filtered digital signals and provides them to an output port. The digital filter integrated circuit may be connected in a token passing configuration with other digital filter integrated circuits to increase the number of sources accommodated.

Signal processing integrated circuit

A programmable correlator for a communication system includes an input queue coupled with an analog-to-digital converter (ADC). The input queue includes a random access memory (RAM) wherein sampled data streams from the ADC are written into the RAM. The input queue has two banks of memory of width 2M. A flexible complex correlator is operable on M samples. The correlator is coupled to read M complex samples out of 2M samples from the input queue. A pseudo-noise (PN) crossbar unit operates to rotate a generated PN code to match a rotation of the input queue data in the complex correlator.

Flexible correlation and queueing in CDMA communication systems

The invention provides a method for generating a code sequence. A code-generation instruction is received from memory. One or more control signals are determined based on the code-generation instruction. A code sequence is generated based on the control signals, a current state input, and a mask input.

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Vernon Hills, IL, United States of America

Zhuan Ye