Patents by Inventor Andrei Popescu

Andrei Popescu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20130077706
    Abstract: The present application relates to a method for reducing the peak-to-mean amplitude ratio of a transmission signal comprising a plurality of coherent replicated signals, and to a transmitted for transmitting such a signal. The transmission signal is separated into the plurality of coherent replicated signals and one of the plurality of replicated signals is delayed with respect to another of the plurality of replicated signals, either in the time domain by introducing a time delay or in the frequency domain by introducing a phase shift. This has the effect of reducing the coherence of the delayed replicated signal with respect to the other replicated signal, reducing the peak power of the signal and therefore reducing the peak-to-mean amplitude ratio of the transmission signal.
    Type: Application
    Filed: September 26, 2011
    Publication date: March 28, 2013
    Applicant: Cambridge Silicon Radio Limited
    Inventors: Andrei POPESCU, Chunyang YU
  • Publication number: 20130028092
    Abstract: A communication device capable of receiving data from a transmitting device via a communications link, the communication device comprising a buffer and being capable of generating, in dependence on the capacity of the buffer to accommodate data received over the communications link, information for inducing the transmitting device to change its data transmission rate, wherein the information imitates a change in a capability of the communication device to receive data via the communications link.
    Type: Application
    Filed: July 12, 2012
    Publication date: January 31, 2013
    Applicant: CAMBRIDGE SILICON RADIO LIMITED
    Inventors: Fei Tong, Andrei Popescu
  • Publication number: 20130010884
    Abstract: This disclosure concerns beam-forming vectors and beam-forming matrices for multiple-input, multiple-output (MIMO) communications systems. These systems, from the method perspective, provide, according to one embodiment, a method of feeding back, to a transmitter from a receiver in a MIMO communications system, at least part of a beam-forming vector of a beam-forming matrix, wherein: the vector relates to a spatial stream of the MIMO system; the vector comprises a series of elements; each element specifies a beam-forming weight for a respective transmit antenna of the transmitter; and the method comprises: calculating a scaling factor that would scale a first element of the vector to a value of one; scaling the other element or elements of the vector with the scaling factor; and feeding back the scaled other element or elements to the transmitter to inform a beam-forming process.
    Type: Application
    Filed: July 8, 2011
    Publication date: January 10, 2013
    Inventors: Fei TONG, Andrei Popescu
  • Publication number: 20120314788
    Abstract: A quantization method for OFDM is described. In an embodiment, the method uses an objective function which is defined as a function of the quantization error of the OFDM signal in frequency summed over data subcarriers. A search algorithm is used to optimize the objective function and the solution found is quantized by rounding. The quantized value of the solution may then be fed back into the objective function to compute a value of that function and if the value is less than the value computed in a previous iteration of the method, the method is repeated using the quantized value of the solution as the new starting point for the search algorithm. If the value of the function is, however, not less than the value computed in a previous iteration, the new solution is discarded and the quantized value of the solution from the previous iteration is output.
    Type: Application
    Filed: November 9, 2010
    Publication date: December 13, 2012
    Applicant: Cambridge Silicon Radio Limited
    Inventors: Wei Shi, Andrei Popescu
  • Publication number: 20120224699
    Abstract: Apparatus to reduce noise in a stereo FM broadcast received via an antenna, the apparatus comprising: a frequency translator configured to translate the received stereo FM broadcast to an intermediate carrier frequency, a demodulation unit configured to demodulate the translated FM signal so as to form left-plus-right and left-minus-right AM signals, a filter configured to form a filtered signal by filtering one of the AM signals, so as to suppress a sub-band of that signal containing unwanted tones, a summing unit for summing the filtered signal and the other of the left-plus-right and left-minus-right signals to produce a stereo audio signal.
    Type: Application
    Filed: November 16, 2010
    Publication date: September 6, 2012
    Applicant: Cambridge Silicon Radio Limited
    Inventors: Jacob Sharpe, Andrei Popescu
  • Publication number: 20120121037
    Abstract: Apparatus for reducing FM click noise on a demodulated FM signal, the apparatus comprising, filter means configured to produce a click detection signal according to the demodulated FM signal, click detection means configured to receive the click detection signal and produce a click occurrence signal, and click correction means configured to correct FM clicks on the de-modulated FM signal according to the click occurrence signal.
    Type: Application
    Filed: March 26, 2010
    Publication date: May 17, 2012
    Applicant: CAMBRIDGE SILICON RADIO LIMITED
    Inventor: Andrei Popescu
  • Publication number: 20110305304
    Abstract: A method of receiving a demodulated waveform according to a protocol in which the waveform represents a block of transmitted bits comprising a first group of bits and a second group of bits, the second group of bits being a function of the first group of bits, the method comprising: sampling the demodulated waveform to recover a first group of sample values corresponding to the first group of transmitted bits and a second group of sample values corresponding to the second group of transmitted bits; assigning bit values to reliable sample values of the first group of sample values; generating a set of candidates for a block of bits corresponding to the demodulated waveform, each candidate comprising a first group of candidate bits and a second group of candidate bits, the first group of candidate bits being generated using the assigned bit values and a combination of bit values unique to that candidate in the set of candidates, and the second group of candidate bits being generated by applying the said functio
    Type: Application
    Filed: November 2, 2009
    Publication date: December 15, 2011
    Applicant: CAMBRIDGE SILICON RADIO LIMITED
    Inventors: Chunyang Yu, Andrei Popescu
  • Publication number: 20110235760
    Abstract: An efficient method of OFDM peak reduction is described. In an embodiment, a set of the most significant peaks in a symbol of an OFDM signal are identified and then, for each identified peak, a shifted and scaled version of a template cancellation signal is subtracted from the OFDM signal. The template cancellation signal is shifted such that its peak aligns with the identified peak and it is scaled such that it has the opposite phase to the identified peak. No iterative peak search and cancellation is involved in peak reduction, i.e. a cancellation step is not followed by another peak search for the same OFDM symbol. The process is repeated for each symbol in turn and in some embodiments the OFDM signal is up-sampled before it is analyzed to identify the most significant peaks.
    Type: Application
    Filed: March 21, 2011
    Publication date: September 29, 2011
    Applicant: CAMBRIDGE SILICON RADIO LTD.
    Inventors: Chunyang Yu, Andrei Popescu
  • Publication number: 20110110470
    Abstract: A method of WLAN frame detection in a received signal, wherein the frame comprises first and second training sequences and the method comprises auto-correlating the signal with a delayed version of itself to establish a first frame boundary estimate based on behaviour of the autocorrelation result due to the inclusion of the first training sequence in the frame, cross-correlating the signal with a copy of the second training sequence at a range of time offsets in order to generate a first cross-correlation profile, classifying the first cross-correlation profile into one of a number of categories, establishing a second frame boundary estimate from the first cross-correlation profile in a manner dependent upon the category assigned to the first cross-correlation profile and determining a refined frame boundary estimate on the basis of a consideration of the first and second frame boundary estimates. Apparatus for performing the method is also described.
    Type: Application
    Filed: November 12, 2009
    Publication date: May 12, 2011
    Applicant: CAMBRIDGE SILICON RADIO LIMITED
    Inventors: CHUNYANG YU, ANDREI POPESCU
  • Publication number: 20110065382
    Abstract: Receiving a Wi-Fi radio signal using a Bluetooth receiver architecture. Also, adapting a Wi-Fi receiver architecture to constrain a received radio signal to less than the bandwidth of a conveyed Wi-Fi signal for subsequent processing purposes.
    Type: Application
    Filed: May 20, 2010
    Publication date: March 17, 2011
    Applicant: CAMBRIDGE SILICON RADIO LIMITED
    Inventors: James Digby Yarlet Collier, Andrei Popescu, David Chappaz
  • Patent number: 7716580
    Abstract: A method for shortening a web page title. The method includes determining if a title of a current web page fits in a title display area of a display. If the title fits the title is displayed in the title area. If the title does not fit, it is determined if the title of the current web page starts with a same word as a title of a previous page. If the title of the current web page starts with the same word, at least one word is removed from a beginning portion of the title of the current page that is in common with the title of the previous page, until the title of the current page fits in the title display area, or there are no more common words in the beginning of the title. End words or letters or end words can be removed until the title fits. Missing words may be indicated by adding a predetermined indicator in the area of the missing or removed words.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: May 11, 2010
    Assignee: Nokia Corporation
    Inventors: Virpi Roto, Elina Vartiainen, Andrei Popescu, Guido Grassel, Salla Myllyia, Mika Rautava
  • Publication number: 20080301555
    Abstract: A system and method for providing animated browser thumbnails for use in a browser. The actions of a user on a particular web page can be recorded and saved by the system as a bookmark and/or other historical item in the browser's browsing history. When the user later decides to scroll through saved bookmarks and/or the browsing history, the browser exhibits the thumbnail to the user in an animated form, playing the user's prior actions back to the user.
    Type: Application
    Filed: May 30, 2007
    Publication date: December 4, 2008
    Inventors: Elina Vartiainen, Jarmo Kauko, Janne Kaasalainen, Andrei Popescu
  • Publication number: 20080163065
    Abstract: A method and system for identifying navigation points on a web page using light sources. A user browses to a web page and at least one area on the web page is selected. The selected area is defined as a navigation point, and the navigation point is highlighted by being illuminated with a light source.
    Type: Application
    Filed: December 29, 2006
    Publication date: July 3, 2008
    Applicant: Nokia Corporation
    Inventors: Elina Vartiainen, Jarmo Kauko, Janne P. Kaasalainen, Andrei Popescu
  • Publication number: 20080160974
    Abstract: A mobile communication device is adapted to identify a task for postponed transfer to a computing device over a local communication link. A similar transfer task function is established on the computing device for receiving the identified task and any required related data. The user is provided with the ability to initiate a task on the mobile communication device and continue or complete the task on a computer.
    Type: Application
    Filed: December 29, 2006
    Publication date: July 3, 2008
    Applicant: NOKIA CORPORATION
    Inventors: Elina Vartiainen, Andrei Popescu, Virpi Roto, Guido Grassel, Mika Rautava
  • Publication number: 20070124700
    Abstract: The present invention relates to a method for creating icons for graphical user interface in an electronic device. The electronic device comprises an icon generation module configured to: analyse at least some contents of a content item, select a portion of the content item on the basis of an algorithm, and specify an icon from the selected content item portion.
    Type: Application
    Filed: November 29, 2005
    Publication date: May 31, 2007
    Inventors: Ari Koivisto, Tero Jokela, Timo Koskinen, Andrei Popescu
  • Publication number: 20070094280
    Abstract: It is presented a method for saving data shown on a display of a mobile terminal, comprising the steps of: receiving an input indicating that currently shown data is to be saved; determining save data, the save data comprising a part of a document shown on the display; and saving the save data in a user-accessible memory. A corresponding apparatus and computer program is also presented.
    Type: Application
    Filed: October 26, 2005
    Publication date: April 26, 2007
    Inventors: Elina Vartiainen, Salla Myllyla, Virpi Roto, Andrei Popescu, Mika Rautava, Guido Grassel
  • Publication number: 20070006100
    Abstract: It is presented a method for controlling displaying of a plurality of pages in a browser application for execution in a mobile communication terminal comprising a display. Said method comprises the steps of: creating a first set of graphical representations of pages previously displayed in a first browser window, if a second browser window exists, creating a second set of graphical representations of pages previously displayed in a second browser window, displaying at least a subset of said first set in a first spatial sequence along a first direction of said display, and if a second browser window exists, displaying at least a subset of said second set in a second spatial sequence along said first direction and separated from said first spatial sequence a distance along a second direction perpendicular to said first direction.
    Type: Application
    Filed: June 29, 2005
    Publication date: January 4, 2007
    Inventors: Virpi Roto, Antti Koivisto, Elina Vartiainen, Andrei Popescu, Guido Grassel
  • Publication number: 20070006074
    Abstract: A method for shortening a web page title. The method includes determining if a title of a current web page fits in a title display area of a display. If the title fits the title is displayed in the title area. If the title does not fit, it is determined if the title of the current web page starts with a same word as a title of a previous page. If the title of the current web page starts with the same word, at least one word is removed from a beginning portion of the title of the current page that is in common with the title of the previous page, until the title of the current page fits in the title display area, or there are no more common words in the beginning of the title. End words or letters or end words can be removed until the title fits. Missing words may be indicated by adding a predetermined indicator in the area of the missing or removed words.
    Type: Application
    Filed: June 30, 2005
    Publication date: January 4, 2007
    Inventors: Virpi Roto, Elina Vartiainen, Andrei Popescu, Guido Grassel, Salla Myllyla, Mika Rautava
  • Publication number: 20060262146
    Abstract: It is shown a method to move focus from a first user interface element to a second user interface element shown on a display of a mobile communication terminal, said mobile communication terminal further comprising an input device.
    Type: Application
    Filed: June 22, 2005
    Publication date: November 23, 2006
    Inventors: Antti Koivisto, Andrei Popescu, Wei Liu, Guido Grassel, Virpi Roto, Lasse Pajunen, Matti Vaisanen
  • Publication number: 20060195784
    Abstract: This invention relates to a method, a computer program product, a device and a system for formatting an object to obtain a formatted object, wherein the object comprises a plurality of elements, and wherein the formatted object is affected by at least one constraint, wherein the constraint is scaled by a first scaling factor to obtain a scaled constraint; wherein at least one of the elements is scaled by a second scaling factor to obtain a scaled element; wherein a layout structure is generated for the plurality of elements including the scaled element under consideration of the scaled constraint; and wherein the layout structure is scaled by a third scaling factor to obtain the formatted object.
    Type: Application
    Filed: February 28, 2005
    Publication date: August 31, 2006
    Inventors: Antti Koivisto, Andrei Popescu, Guido Grassel, Virpi Roto, Roland Geisler, Mikko Makela