Patents Assigned to Broadcom Corporation
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Publication number: 20130028351Abstract: A receiver includes a sample and hold module, sample memory, a discrete time filter module, and a conversion module. The sample and hold module is operable to sample and hold an inbound wireless signal to produce a frequency domain sample pulse train. The sample memory is operable to store sample pulses of the frequency domain sample pulse train to produce a stored sample pulse train. The discrete time filter module is operable to filter the stored sample pulse train to produce a filtered sample pulse. The conversion module is operable to convert the filtered sample pulse into an inbound baseband signal.Type: ApplicationFiled: September 23, 2011Publication date: January 31, 2013Applicant: Broadcom CorporationInventors: Ahmadreza (Reza) ROFOUGARAN, Hooman DARABI
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Publication number: 20130028363Abstract: A receiver includes a sample and hold module, a discrete time filter module, and a conversion module. The sample and hold module is operable to sample and hold a first inbound wireless signal and a second inbound wireless signal to produce a frequency domain sample pulse train. The discrete time filter module is operable to filter the frequency domain sample pulse train to produce a first filtered sample pulse corresponding to the first inbound wireless signal and to produce a second filtered sample pulse corresponding to the second inbound wireless signal. The conversion module is operable to convert the first filtered sample pulse into a first inbound baseband signal and to convert the second filtered sample pulse into a second inbound baseband signal.Type: ApplicationFiled: September 23, 2011Publication date: January 31, 2013Applicant: Broadcom CorporationInventors: Ahmadreza (Reza) ROFOUGARAN, Hooman DARABI
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Publication number: 20130029613Abstract: Methods and systems for coexistence in a multiband, multistandard communication system utilizing a plurality of phase locked loops (PLLs) are disclosed. Aspects may include determining one or more desired frequencies of operation of a transceiver, determining a frequency of unwanted signals such as spurs, intermodulation, and/or mixing product signals, and configuring the Plls to operate at a multiple of the desired frequencies while avoiding the unwanted signals. The desired frequencies may be generated utilizing integer, which may include multi-modulus dividers. The wireless standards may include LTE, GSM, EDGE, GPS, Bluetooth, WiFi, and/or WCOMA, for example. The frequencies may be configured to mitigate interference. Plls may be shared when operating in TOO mode, and used separately operating in FOO mode. One or more digital interface signals, zero exceptions on a transmitter spur emission mask, and sampling clocks for AOCs and/or DACs in the transceiver may be generated utilizing the PLLs.Type: ApplicationFiled: September 13, 2012Publication date: January 31, 2013Applicant: Broadcom CorporationInventors: Nikolaos HARALABIDIS, Ioannis Kokolakis, Nikolaos Kanakaris, Konstantinos Vavelidis
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Patent number: 8363445Abstract: According to one exemplary embodiment, a one-time programmable memory cell includes an access transistor coupled to a shiftable threshold voltage transistor between a bitline and a ground, where the access transistor has a gate coupled to a wordline. The shiftable threshold voltage transistor has a drain and a gate shorted together. A programming operation causes a permanent shift in a threshold voltage of the shiftable threshold voltage transistor to occur in response to a programming voltage on the bitline and the wordline. In one embodiment, the access transistor is an NFET while the shiftable threshold voltage transistor is a PFET. In another embodiment, the access transistor is an NFET and the shiftable threshold voltage transistor is also an NFET. The programming voltage can cause an absolute value of the threshold voltage to permanently increase by at least 50.0 millivolts.Type: GrantFiled: October 27, 2011Date of Patent: January 29, 2013Assignee: Broadcom CorporationInventors: Frank Hui, Xiangdong Chen, Wei Xia
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Patent number: 8363567Abstract: In a wireless system, a method and system for channel estimation in a single channel MIMO system comprising two-transmit and multiple-receive antennas for WCDMA/HSDPA are provided. A first receive antenna and at least one additional receive antenna may receive a plurality of SC communication signals transmitted from a first and an additional transmit antennas. Estimates of the propagation channels between transmit and receive antennas may be performed concurrently and may be determined from a baseband combined channel estimate. The integration time may be based on channel estimation accuracy and wireless modem performance. The signals received in the additional receive antennas may be multiplied by a rotation waveform to achieve channel orthogonality. The rotation waveform's amplitude and phase components may be modified based on the channel estimates. Rotation of the received signals in the additional receive antennas may be continuous or periodic.Type: GrantFiled: February 8, 2011Date of Patent: January 29, 2013Assignee: Broadcom CorporationInventors: Mark Kent, Vinko Erceg, Uri M Landau, Pieter G. W. van Rooyen, Pieter Roux
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Patent number: 8364080Abstract: A method and system for achieving enhanced quality and higher throughput for collocated IEEE 802.11b/g and Bluetooth (BT) devices in coexistent operation are provided. A priority signal may be generated by a BT radio in a coexistence station to disable WLAN transmissions in a WLAN radio when a BT HV3 frame is available for transmission. When the priority signal is asserted, an exponentially growing retransmission backoff mechanism in the WLAN radio may be disabled. Moreover, when the BT radio and the WLAN radio are enabled for coexistence operation, a WLAN fragmentation threshold in the WLAN radio may be modified based on a WLAN modulation rate and the BT HV3 frame duration.Type: GrantFiled: June 2, 2005Date of Patent: January 29, 2013Assignee: Broadcom CorporationInventors: Prasanna Desai, Brima Ibrahim
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Patent number: 8364200Abstract: A system and method providing concurrent multimode communication through multimode signal multiplexing. Various aspects of the present invention may comprise, during a first time period, transmitting a first portion of a first communication in a first communication mode in a serial wireless transmission stream. During a second time period after the first time period, a first portion of a second communication may be transmitted in a second communication mode in the serial wireless transmission stream. Also, during a third time period after the second time period, a second portion of the first communication may be transmitted in the first communication mode in the serial wireless transmission stream. In an exemplary scenario, prior to communicating various communications, transmission time may be allocated between the first and second communication modes. In another exemplary scenario, transmission may be switched between a plurality of communication modes in response to detected communication conditions.Type: GrantFiled: April 20, 2012Date of Patent: January 29, 2013Assignee: Broadcom CorporationInventors: Ahmadreza Rofougaran, Arya Behzad
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Patent number: 8363696Abstract: A system for implementing an orthogonal frequency division multiplexing scheme and providing an improved range extension. The system includes a transmitter for transmitting data to a receiver. The transmitter includes a symbol mapper for generating a symbol for each of a plurality of subcarriers and a spreading module for spreading out the symbol on each of the plurality of subcarriers by using a direct sequence spread spectrum. The symbol on each of the plurality of subcarriers is spread by multiplying the symbol by predefined length sequences. The receiver includes a de-spreader module for de-spreading the symbols on each of the plurality of subcarriers. The de-spreader module includes a simply correlator receiver for obtaining maximum detection. The correlator produces an output sequence of a same length as an input sequence and the de-spreader module uses a point of maximum correlation on the output sequence to obtain a recovered symbol.Type: GrantFiled: September 6, 2011Date of Patent: January 29, 2013Assignee: Broadcom CorporationInventor: Jason Alexander Trachewsky
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Patent number: 8364106Abstract: A multiple band direct conversion radio frequency (RF) transceiver integrated circuit (IC) includes a multiple band direct conversion transmitter section, a multiple band direct conversion receiver section, and a local oscillation module. The multiple band direct conversion transmitter section includes a transmit baseband module and a multiple frequency band transmission module. The multiple band direct conversion receiver section includes a multiple frequency band reception module and a receiver baseband module. The local oscillation generation module is coupled to generate a first frequency band local oscillation when the multiple band direct conversion RF transceiver IC is in the first mode and coupled to generate a second frequency band local oscillation when the multiple band direct conversion RF transceiver IC is in the second mode.Type: GrantFiled: August 23, 2010Date of Patent: January 29, 2013Assignee: Broadcom CorporationInventor: Arya Reza Behzad
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Patent number: 8362741Abstract: Disclosed is a method for use by a device to distinguish between a Charging Downstream Port (“CDP”) and a Dedicated Charging Port (“DCP”). The method comprises detecting that the device is attached to a charging port, and determining whether the charging port is the CDP or the DCP without causing a host coupled to the CDP to be able to detect the device if the charging port is the CDP.Type: GrantFiled: March 25, 2010Date of Patent: January 29, 2013Assignee: Broadcom CorporationInventor: Sebastian Joseph Capella
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Patent number: 8363762Abstract: The present invention provides digital subscriber line noise mitigation techniques, and applications thereof. In an embodiment, the present invention provides a toolbox of methods and techniques for mitigating the effects of noise in xDSL systems. These methods and techniques are controllable and locatable at one or both ends of a DSL communication link (e.g., within a central office transceiver unit or a remote transceiver unit). These novel methods and techniques include: (1) per tone noise margin modification, (2) data framer constraints modification, (3) improved noise measurements; (4) more robust on-line reconfiguration processes, (5) worst case noise monitoring, (6) induced bit rate limitations, and (7) distortion noise mitigation. These methods and techniques are particularly useful for mitigating the effects of time-varying noise and impulse noise.Type: GrantFiled: May 9, 2011Date of Patent: January 29, 2013Assignee: Broadcom CorporationInventors: Olivier Van de Wiel, Koen Vanbleu, Jean Boxho, Miguel Peeters
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Patent number: 8364100Abstract: Methods and systems for a transmitter LOFT cancellation scheme that maintains IQ balance are disclosed. Aspects of one method may include providing current compensation to both differential inputs of a mixer for each of I and Q channels. An initial current compensation of X units may be provided, followed by subsequent compensation as needed. The initial compensation may be provided to each differential input of the mixers used for I and Q channels. The subsequent current compensation for the I channel may be independent of the subsequent current compensation for the Q channel. Subsequent current compensation to a first differential input for a mixer may be increased by Y units while decreasing current compensation to the second differential input of the mixer by Y units. In this manner, the DC common mode level for the mixer may remain the same at the initial DC compensation current of X units for both mixers.Type: GrantFiled: June 3, 2010Date of Patent: January 29, 2013Assignee: Broadcom CorporationInventor: Meng-An Pan
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Patent number: 8364024Abstract: Video frames from a sequence of video frames and corresponding audio are received and processed by a media player. A first portion of the sequence depends on fewer reference frames then a second portion of the sequence. The number of reference frames per frame is limited. The first and second portions of the sequence are treated differently. The first portion is received at a lower data rate, with greater security and processed with a more robust protocol stack than the second portion. The first and second portions may be stored in a single queue and/or separate queues. The first portion of frame data is utilized to compensate for lost frames by repeating and/or interpolating video frames. The media player constructs a local video frame and synchronizes corresponding audio content with it. The received, repeated and/or interpolated video frames are assembled into display order and decoded.Type: GrantFiled: February 3, 2009Date of Patent: January 29, 2013Assignee: Broadcom CorporationInventors: James D. Bennett, Jeyhan Karaoguz
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Patent number: 8365001Abstract: A method and apparatus are disclosed for performing adaptive memory power management in a system employing a CPU and a memory subsystem. A CPU throttle control (THR) module generates a CPU throttle control signal indicating when the CPU is idle. A memory controller (MC) module generates memory power management signals based on at least one of the CPU throttle control signal, memory read/write signals, memory access break events, and bus master access requests. Certain portions of the memory subsystem are powered down in response to the memory power management signals. Memory power management is performed on a time segment by time segment basis to achieve efficient power management of the memory subsystem during CPU run time.Type: GrantFiled: March 2, 2009Date of Patent: January 29, 2013Assignee: Broadcom CorporationInventor: Kenneth Ma
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Patent number: 8363683Abstract: Digital signal processing based methods and systems for receiving data signals include parallel receivers, multi-channel receivers, timing recovery schemes, and, without limitation, equalization schemes. The present invention is implemented as a multi-path parallel receiver in which an analog-to-digital converter (“ADC”) and/or a digital signal processor (“DSP”) are implemented with parallel paths that operate at lower rates than the received data signal. In an embodiment, a parallel DSP-based receiver in accordance with the invention includes a separate timing recovery loop for each ADC path. In an embodiment, a parallel DSP-based receiver includes a separate automatic gain control (AGC) loop for each ADC path. In an embodiment, a parallel DSP-based receiver includes a separate offset compensation loop for each ADC path. In an embodiment, the present invention is implemented as a multi-channel receiver that receives a plurality of data signals.Type: GrantFiled: August 16, 2010Date of Patent: January 29, 2013Assignee: Broadcom CorporationInventors: Oscar Agazzi, Venugopal Gopinathan
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Patent number: 8365308Abstract: A security processor integrated within a system may be securely shut down. The security processor may receive shut down requests, and may determine components and/or subsystems that need be shut down during shut down periods. The security processor may determine when each of the relevant components is ready for shut down. Once the relevant components are shut down, the security processor may itself be shut down, wherein the shut down of the security processor may be performed by stopping the clocking of the security processor. A security error monitor may monitor the system during shut down periods, and the security processor may be powered back on when security breaches and/or threats may be detected via the security error monitor. The security error monitor may be enabled to power on the security processor by reactivating the security processor clock, and the security processor may then power on the system.Type: GrantFiled: October 9, 2008Date of Patent: January 29, 2013Assignee: Broadcom CorporationInventors: Stephane Rodgers, Iue-Shuenn Chen
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Patent number: 8363161Abstract: Methods of processing an audiovisual signal that has a video portion and an audio portion are described. One example includes detecting a video synchronization event in the video portion and, in response to the detecting, embedding a marker relating to the video synchronization event into a serial data stream carrying the audio portion. The serial data stream includes a series of packets, each packet having (A) a preamble that includes a synchronization sequence, (B) an auxiliary data field, and (C) a main data field.Type: GrantFiled: May 25, 2007Date of Patent: January 29, 2013Assignee: Broadcom CorporationInventor: Larry Pearlstein
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Patent number: 8363642Abstract: A method for receiving a frame in a high data throughput wireless local area network begins by receiving a preamble of the frame via a channel in accordance with a default receiver filter mask. The processing continues by validating the preamble. The processing continues by, when the preamble is validated, interpreting the preamble to determine a high data throughput channel configuration. The processing continues by reconfiguring the default receiver filter mask in accordance with the high data throughput channel configuration to produce a reconfigured receiver filter mask. The processing continues by receiving a data segment of the frame in accordance with the reconfigured receiver filter mask.Type: GrantFiled: April 20, 2009Date of Patent: January 29, 2013Assignee: Broadcom CorporationInventors: Tushar Moorti, Christopher J. Hansen, Jason A. Trachewsky
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Publication number: 20130021958Abstract: Certain embodiments of the invention may be found in a method and system for minimizing power consumption in a communication system. Exemplary aspects of the invention may comprise configuring a supply voltage of an amplifier to enable communication of data using a first communication protocol during a first timeslot in a TDM frame, reconfiguring the supply voltage of the amplifier to enable communication of data using a different communication protocol, and adjusting the supply voltage of the amplifier in proportion to the envelope of a baseband signal conforming to one of the communication protocols. The first and second communication protocols may conform to various communication protocols, such as WCDMA, HSDPA, HSUDPA, GSM, GPRS, EDGE, WiMAX, OFDM, UWB, ZigBee, and Bluetooth. The baseband signal may be delayed by a number of samples before being input into the amplifier.Type: ApplicationFiled: July 25, 2012Publication date: January 24, 2013Applicant: Broadcom CorporationInventor: Ahmadreza Rofougaran
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Publication number: 20130023290Abstract: A mobile communication device includes a motion sensor for generating motion signals in response to motion of the mobile communication device. A motion data generation module generates motion data based on the motion signals. At least one transceiver sends the motion data to a game device in a gaming mode of operation and transceives wireless telephony data with a wireless telephony network in a telephony mode of operation.Type: ApplicationFiled: September 26, 2012Publication date: January 24, 2013Applicant: Broadcom CorporationInventor: Broadcom Corporation