Nxp B.v.

Telefonaktiebolaget Lm Ericsson (publ)

St-ericsson Sa

Agere Systems Inc.

Naveen Jacob

Sajal Kumar Das

Ravi Jandial

Rajesh Kurian

Ivine Kuruvila

Chaithanya Velampalli

Amit Singhal

A radio receiver is disclosed. The radio receiver includes an analog tuner and a baseband processor to provide radio functions. The baseband processor is coupled to the analog tuner. The radio receiver further includes a memory, a controller coupled to the analog tuner, the baseband processor and the memory. The controller is configured to perform an operation, the operation includes causing the analog tuner to analyze a selected FM frequency to determine if the selected FM frequency is associated with a digital radio mondiale (DRM) plus station by first coarsely determine if the selected FM frequency may be associated with a DRM plus station and if coarse determination fails, marking the FM frequency as not being associated with a DRM plus station, wherein if the coarse determination is successful, retrying a selected number of times to continue to determine if the selected FM frequency is associated with a DRM plus station.

Detection for digital radio mondiale plus in hybrid broadcasting mode

Aspects of the disclosure are directed to providing signals utilizing two or more sources. As may be implemented in accordance with one or more embodiments, a method and/or apparatus involves processing respective signals carrying broadcast data provided by different receiver circuits that respectively receive the same broadcast data. The signals received from the respective receiver circuits are equalized, and corresponding sets of the broadcast data from each of the equalized signals are selectively combined to provide a combined signal carrying the broadcast data. This approach may be used, for example, to generate broadcast data utilizing source data from two or more receivers, such as may be received on different signal mediums (e.g., over-the-air digital radio and Wi-Fi digital radio), and therein providing enhanced reception.

Signal processing using multiple sources

An embedded system is described. The embedded system includes a processing circuit comprising 'Q' processing units that can be operated in parallel. A memory is operably coupled to the processing circuit and includes at least input data. The processing circuit is configured to support an implementation of a non-power-of-2 fast Fourier transform of length N using a multiplication of at least two smaller FFTs of a respective first length N1 and second length N2, where N1 and N2 are whole numbers. The processing circuit is further configured to employ a customized instruction configured to perform an FFT operation of length less than 'Q' using a first of the at least two smaller FFTs.

Embedded system, method and communication unit for implementing a fast fourier transform using customized instructions

A signal processor and method of signal processing to reduce delays in channel estimation is described. In the method, the following operations are performed: receiving a signal at a signal processor (); estimating a first channel from the received signal with a one-dimensional, 1D, frequency filter () in a frequency domain to generate an interim output; decoding said interim output () to generate decoded interim output; estimating () at least a second channel from the decoded interim output with a two-dimensional, 2D, filter () to produce a final output ().

Method and apparatus to reduce delays in channel estimation

An embedded system is described. The embedded system includes a processing circuit comprising at least one processor configured to support an implementation of a non-power-of-2 fast Fourier transform of length N using a multiplication of at least two smaller FFTs of a respective first length N1 and second length N2, where N1 and N2 are whole numbers; and a memory, operably coupled to the processing circuit and comprising at least input data. The processing circuit is configured to: receive an input data complex number sequence; adapt the input data complex number sequence by inserting at least one zero into every Xdata point that results in an excess number of data points above N, where X=N1, such that the inserted zeroes enables a use of a multiple-of-Q FFT; perform a first decomposed FFT of a respective first length N1 on the adapted input data complex number sequence and produce a first output complex number sequence; restore a number of data points of the first output complex number sequence to N after performing the first decomposed FFT; and perform a second decomposed FFT of a respective second length N2 on the first output complex number sequence that produces a second output complex number sequence.

Embedded system, communication unit and methods for implementing a fast fourier transform

A radio receiver is disclosed. The radio receiver includes an analog tuner and a baseband processor to provide radio functions. The baseband processor is coupled to the analog tuner. The radio receiver further includes a memory and a controller coupled to the analog tuner, the baseband processor and the memory. The controller is configured to perform an operation and the operation includes causing the analog tuner to scan a spectral band to identify radio stations and based on a signal matrix obtained from scanning a station in the spectral band tentatively determining if the station represents a digital radio mondiale (DRM) station and if so, storing the station in a list of possible DRM stations in the memory.

Radio receiver system

A system and method are provided for estimating interference power at a receiver antenna in a communications systems receiver, in which an interference type signal associated with a received radio signal is detected, an in-band interference power associated with the received radio signal is determined, and an interference power at the antenna is estimated using the determined in-band interference power and the detected interference type. Estimating the interference power at the antenna includes interpolating the determined in-band interference power using scaling factors determined by the interference type signal associated with the received radio signal. The system and method determine in-band carrier power associated with the radio signal based on a channel estimate h(k), and the in-band interference information is based on interference samples I(n). In addition, an average total power, automatic gain control (AGC) setting, and signal-to-information-and-noise ratio can be determined by the system and method.

Method for interference and carrier power estimation and its application to automatic gain control and signal-to-interference-and-noise-ratio computation

A wireless communication apparatus is arranged to detect, among a plurality of modulated carrier signals of different frequencies, at least one of the modulated carrier signals modulated with a tone burst. A receiver provides a composite signal comprising the plurality of modulated carrier signals received simultaneously. An ADC generates samples of the composite signal, and the samples of the composite signal are divided into a plurality of blocks. The samples of each block are transformed into frequency domain components, and the frequency domain components of each block are divided into a plurality of groups, each group corresponding to a range of frequencies occupied by a different one of the modulated carrier signals. Tone burst detection is performed on each group, and it is determined which of the modulated carrier signals is modulated with the tone burst, according to which of the groups the tone burst is detected in.

Carrier detection and parallel GSM cell search in multimode terminals

A desired signal and interfering signal are transmitted in the same timeslot and on the same frequency using an Adaptive Quadrature Phase Shift Keying (AQPSK) modulated carrier. When the Subchannel Power Imbalance Ratio (SCPIR) for the AQPSK modulated carrier is large and favors the interfering signal, SIC is used to cancel the interfering signal from the received signal. Following interference cancellation, the desired signal is demodulated using two different estimates of the channel and the demodulated soft bits from demodulated soft bits from each demodulation process are combined to obtain a combined estimate.

Demodulation in VAMOS receivers

A receiver receives a desired radio sub-channel transmitted with an unwanted radio sub-channel by producing signal branches from a received radio signal by treating orthogonal components of the received signal separately and also by using one or both of oversampling and multiple receive antennas. Channel estimates for both the desired and unwanted radio sub-channels are produced for signal branches. The unwanted radio sub-channel bits are estimated from a non-stacked form of the received radio signal. The channel estimates and the estimate of the unwanted radio sub-channel bits are used to reconstruct unwanted radio sub-channel components separately for signal branches. Desired radio sub-channel signal branches are produced by subtracting a corresponding one of the reconstructed unwanted radio sub-channel components from signal branches. A non-stacked desired signal is produced by combining the desired radio sub-channel signal branches. The non-stacked desired signal is processed to receive the desired radio sub-channel.

Successive interference cancellation stacked branch VAMOS receivers

A desired signal and interfering signal are transmitted in the same timeslot and on the same frequency using an Adaptive Quadrature Phase Shift Keying (AQPSK) modulated carrier. When the Sub-Channel Power Imbalance Ratio (SCPIR) for the AQPSK modulated carrier is large and favors the interfering signal, the interfering signal is demodulated first to obtain demodulated soft bits. The demodulated soft bits corresponding to the interfering signal are then used to estimate receiver control parameters, such as Doppler shift, frequency offset, timing error, gain, etc. Using the demodulated soft bits corresponding to the interfering signal improves the accuracy of the receiver control parameters when the SCPIR is large, and results in better overall performance of the receiver.

Parameter estimation in VAMOUS receivers

A method for seamless noise suppression on wideband to narrowband cell switching is described. In one embodiment the method includes applying noise suppression to a telephone signal using a first noise suppressor while operating a telephone in a first operating mode, the first noise suppressor generating an estimate of a noise components of the telephone signal; switching the telephone from the first operating mode to a second operating mode; providing the estimate of the noise component as an input to a second noise suppressor different from the first noise suppressor, when the switching step is performed; and applying noise suppression to the telephone signal using the second noise suppressor by using the estimate of the noise component provided by the first noise suppressor when the switching step is performed.

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Bengaluru, India

Naveen Jacob