Patents Assigned to Qualcomm Inc.
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Publication number: 20070207823Abstract: Methods and systems for signaling on a mixed-mode wireless network comprising a plurality of channels are provided. The mixed-mode wireless network includes high-throughput (HT) wireless devices and legacy wireless devices that use channels of the same width. The HT devices transmit data on at least two channels, while the legacy devices transmit on one channel. The distances between the HT channels and the distances between the legacy channels might differ, however, the channels used by the HT devices and the legacy devices may overlap. As a result, cooperation between the HT devices and legacy devices is provided to enable the devices to coexist on the same wireless network by minimizing collisions and interference. The HT devices are configured to send control information to the legacy devices to coordinate transmission by the HT devices with the legacy devices.Type: ApplicationFiled: March 2, 2007Publication date: September 6, 2007Applicant: Qualcomm, Inc.Inventors: D.J. van Nee, Vincent Jones
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Publication number: 20070177569Abstract: Techniques for efficient data transmission and reception in a wireless communication system are described. In an aspect, a Node B sends transmissions on a shared data channel to a user equipment (UE) based on at least one parameter assigned to the UE prior to the transmissions. The Node B sends no signaling for the transmissions sent to the UE on the shared data channel. The UE processes the transmissions received from the shared data channel based on the assigned parameter(s). In another aspect, a Node B may send transmissions to a UE in time intervals assigned to the UE. In yet another aspect, a Node B may send transmissions to a UE based on assigned or non-assigned parameters. The Node B sends signaling whenever transmissions are sent with non-assigned parameters. The UE may process a transmission based on parameters obtained from received signaling or the assigned parameters.Type: ApplicationFiled: October 26, 2006Publication date: August 2, 2007Applicant: QUALCOMM, INC.Inventor: Stein Lundby
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Publication number: 20070168410Abstract: Techniques for efficiently performing transforms on data are described. In one design, an apparatus performs multiplication of a first group of at least one data value with a first group of at least one rational dyadic constant that approximates a first group of at least one irrational constant scaled by a first common factor. The apparatus further performs multiplication of a second group of at least one data value with a second group of at least one rational dyadic constant that approximates a second group of at least one irrational constant scaled by a second common factor. Each rational dyadic constant is a rational number with a dyadic denominator. The first and second groups of at least one data value have different sizes. The first and common factors may be selected based on the number of logical and arithmetic operations for the multiplications, the precision of the results, etc.Type: ApplicationFiled: January 10, 2007Publication date: July 19, 2007Applicant: QUALCOMM, INC.Inventor: Yuriy Reznik
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Patent number: 7245600Abstract: In a communication system (100), a method and apparatus provides for determining reverse link load level for reverse link data rate scheduling. The method and apparatus include determining a number of locked fingers (208) on a reverse link signal in a receiver portion (200) of a base station, summing energy per bit or carrier energy over noise plus interference ratio of the reverse link signal at the locked fingers, and determining a reverse link capacity based on the summed energy per bit over noise plus interference ratio. A maximum reverse link data rate supported for a mobile station is determined for the reverse link communication with the base station. After communicating the maximum reverse link data rate to the mobile station, a reverse link data rate from mobile station to the base station is adjusted based on the maximum reverse link data rate.Type: GrantFiled: November 5, 2001Date of Patent: July 17, 2007Assignee: Qualcomm, Inc.Inventor: Tao Chen
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Patent number: 7245666Abstract: Soft symbol decoder algorithms for multiple input, multiple output (MIMO) receivers reduce the search complexity by searching over fewer than all possible combinations of transmitted symbols to compute log metrics for each transmitted bit from each transmit antenna. In one algorithm, a sub-optimal set of transmitted symbols is computed and the transmitted symbols are restricted to neighboring constellation points of the sub-optimal set. In another algorithm, all constellation points are searched for every antenna except one. In yet another algorithm, constellation points are searched excluding more than one antenna. The non-searched antenna(s) can be handled by either a bit stuffing or a soft slicing technique.Type: GrantFiled: April 3, 2003Date of Patent: July 17, 2007Assignee: Qualcomm, Inc.Inventors: James Gardner, Vincent K. Jones, D. J. Richard van Nee
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Publication number: 20070127588Abstract: Techniques for performing channel and noise estimation for a MIMO transmission sent from multiple transmit antennas to multiple receive antennas are described. Samples are obtained from the receive antennas. For a first scheme, channel estimates are derived by correlating the samples with at least one pilot sequence, and signal, noise and interference statistics are also estimated based on the samples. For a second scheme, total received energy as well as signal and interference energy are estimated based on the samples. Noise is then estimated based on the estimated total received energy and the estimated signal and interference energy. For a third scheme, signal and on-time interference statistics are estimated based on the samples. Noise and multipath interference statistics are also estimated based on the samples. Signal, noise and interference statistics are then estimated based on the estimated signal and on-time interference statistics and the estimated noise and multipath interference statistics.Type: ApplicationFiled: October 26, 2006Publication date: June 7, 2007Applicant: QUALCOMM, INC.Inventor: Byoung-Hoon Kim
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Publication number: 20070116282Abstract: Method and apparatus for secure transmissions. Each user is provided a registration key. A long-time updated broadcast key is encrypted using the registration key and provided periodically to a user. A short-time updated key is encrypted using the broadcast key and provided periodically to a user. Broadcasts are then encrypted using the short-time key, wherein the user decrypts the broadcast message using the short-time key. One embodiment provides link layer content encryption. Another embodiment provides end-to-end encryption.Type: ApplicationFiled: January 24, 2007Publication date: May 24, 2007Applicant: QUALCOMM, INC.Inventors: Philip Hawkes, Raymond Hsu, Ramin Rezaiifar, Gregory Rose, Paul Bender, Jun Wang, Roy Quick, Arungundram Mahendran, Parag Agashe
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Publication number: 20070116102Abstract: Demodulator architectures for processing a received signal in a wireless communications system. The demodulator includes a number of correlators coupled to a combiner. Each correlator typically receives and despreads input samples (which are generated from the received signal) with a respective despreading sequence to provide despread samples. Each correlator then decovers the despread samples to provide decovered “half-symbols” and further demodulates the decovered half-symbols with pilot estimates to generate correlated symbols. The decovering is performed with a Walsh symbol having a length (T) that is half the length (2T) of a Walsh symbol used to cover the data symbols in the transmitted signal. The combiner selectively combines correlated symbols from the assigned correlators to provide demodulated symbols. One or more correlators can be assigned to process one or more instances of each transmitted signal.Type: ApplicationFiled: January 17, 2007Publication date: May 24, 2007Applicant: QUALCOMM, INC.Inventors: Douglas Rowitch, Way-Shing Lee, Thunyachate Ekvetchavit
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Publication number: 20070116101Abstract: Demodulator architectures for processing a received signal in a wireless communications system. The demodulator includes a number of correlators coupled to a combiner. Each correlator typically receives and despreads input samples (which are generated from the received signal) with a respective despreading sequence to provide despread samples. Each correlator then decovers the despread samples to provide decovered “half-symbols” and further demodulates the decovered half-symbols with pilot estimates to generate correlated symbols. The decovering is performed with a Walsh symbol having a length (T) that is half the length (2T) of a Walsh symbol used to cover the data symbols in the transmitted signal. The combiner selectively combines correlated symbols from the assigned correlators to provide demodulated symbols. One or more correlators can be assigned to process one or more instances of each transmitted signal.Type: ApplicationFiled: January 17, 2007Publication date: May 24, 2007Applicant: QUALCOMM, INC.Inventors: Douglas Rowitch, Way-Shing Lee, Thunyachate Ekvetchavit
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Publication number: 20070111669Abstract: A method and apparatus for providing uplink signal-to-noise ratio (SNR) estimation in a wireless communication system. A first signal is received over a first channel and a second signal is received over a second channel, where the second signal is received at a higher signal power level than said first signal. A signal-to-noise ratio (SNR) of the second signal is measured, and the SNR of the first signal is determined based at least in part upon the measured SNR of the second signal.Type: ApplicationFiled: January 2, 2007Publication date: May 17, 2007Applicant: QUALCOMM, INC.Inventor: Durga Malladi
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Publication number: 20070093201Abstract: Method and apparatus for detection and selection of Wireless Local Area Network (WLAN) service. A cellular network may provide an advertisement for a WLAN, such as in an overhead signaling message. The advertisement may identify the Access Point(s) by an Extended Service Set Identifier (ESSID). The remote station may then scan for the WLAN service automatically or manually.Type: ApplicationFiled: November 21, 2006Publication date: April 26, 2007Applicant: QUALCOMM, INC.Inventors: Raymond Hsu, Ragulan Sinnarajah
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Publication number: 20070091854Abstract: Techniques for minimizing call setup latency are disclosed. In one aspect, a channel assignment message is sent with a flag to direct the use of previously negotiated service parameters. This aspect eliminates the need for service negotiation messages. In another aspect, a channel assignment message is sent with an active set identifier instead of an active set and its parameters. This aspect reduces the transmission time of the channel assignment message. In yet another aspect, call setup without paging is facilitated by a mobile station (106) sending a pilot strength measurement message between active communication sessions, such that a channel assignment message can be used for mobile station terminated call setup without the need for mobile station paging and related messages.Type: ApplicationFiled: November 30, 2006Publication date: April 26, 2007Applicant: QUALCOMM, INC.Inventors: Ragulan Sinnarajah, Edward Tiedemann, Ramin Rezaiifar, Jun Wang, Duncan Ho
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Publication number: 20070086390Abstract: Techniques for minimizing call setup latency are disclosed. In one aspect, a channel assignment message is sent with a flag to direct the use of previously negotiated service parameters. This aspect eliminates the need for service negotiation messages. In another aspect, a channel assignment message is sent with an active set identifier instead of an active set and its parameters. This aspect reduces the transmission time of the channel assignment message. In yet another aspect, call setup without paging is facilitated by a mobile station (106) sending a pilot strength measurement message between active communication sessions, such that a channel assignment message can be used for mobile station terminated call setup without the need for mobile station paging and related messages.Type: ApplicationFiled: November 30, 2006Publication date: April 19, 2007Applicant: QUALCOMM, INC.Inventors: Ragulan Sinnarajah, Edward Tiedemann, Ramin Rezaiifar, Jun Wang, Duncan Ho
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Publication number: 20070086391Abstract: Techniques for minimizing call setup latency are disclosed. In one aspect, a channel assignment message is sent with a flag to direct the use of previously negotiated service parameters. This aspect eliminates the need for service negotiation messages. In another aspect, a channel assignment message is sent with an active set identifier instead of an active set and its parameters. This aspect reduces the transmission time of the channel assignment message. In yet another aspect, call setup without paging is facilitated by a mobile station (106) sending a pilot strength measurement message between active communication sessions, such that a channel assignment message can be used for mobile station terminated call setup without the need for mobile station paging and related messages.Type: ApplicationFiled: November 30, 2006Publication date: April 19, 2007Applicant: QUALCOMM, INC.Inventors: Ragulan Sinnarajah, Edward Tiedemann, Ramin Rezaiifar, Jun Wang, Duncan Ho
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Publication number: 20070086513Abstract: Method and apparatus to compute the combiner coefficients for wireless communication systems using an adaptive algorithm. One embodiment trains the weights on a signal known a priori that is time multiplexed with other signals, such as a pilot signal in a High Data Rate, HDR, system, wherein the signal is transmitted at full power. The adaptive algorithm recursively computes the weights during the pilot interval and applies the weights generated to the traffic signals. In one embodiment, the algorithm is a recursive least squares algorithm employing a transversal filter and weight calculation unit.Type: ApplicationFiled: November 29, 2006Publication date: April 19, 2007Applicant: QUALCOMM, INC.Inventors: Ivan Fernandez-Corbaton, John Smee, Srikant Jayaraman
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Publication number: 20070086392Abstract: Techniques for minimizing call setup latency are disclosed. In one aspect, a channel assignment message is sent with a flag to direct the use of previously negotiated service parameters. This aspect eliminates the need for service negotiation messages. In another aspect, a channel assignment message is sent with an active set identifier instead of an active set and its parameters. This aspect reduces the transmission time of the channel assignment message. In yet another aspect, call setup without paging is facilitated by a mobile station (106) sending a pilot strength measurement message between active communication sessions, such that a channel assignment message can be used for mobile station terminated call setup without the need for mobile station paging and related messages.Type: ApplicationFiled: November 30, 2006Publication date: April 19, 2007Applicant: QUALCOMM, INC.Inventors: Ragulan Sinnarajah, Edward Tiedemann, Ramin Rezaiifar, Jun Wang, Duncan Ho
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Publication number: 20070086393Abstract: Techniques for minimizing call setup latency are disclosed. In one aspect, a channel assignment message is sent with a flag to direct the use of previously negotiated service parameters. This aspect eliminates the need for service negotiation messages. In another aspect, a channel assignment message is sent with an active set identifier instead of an active set and its parameters. This aspect reduces the transmission time of the channel assignment message. In yet another aspect, call setup without paging is facilitated by a mobile station (106) sending a pilot strength measurement message between active communication sessions, such that a channel assignment message can be used for mobile station terminated call setup without the need for mobile station paging and related messages.Type: ApplicationFiled: November 30, 2006Publication date: April 19, 2007Applicant: QUALCOMM, INC.Inventors: Ragulan Sinnarajah, Edward Tiedemann, Ramin Rezaiifar, Jun Wang, Duncan Ho
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Patent number: 7203319Abstract: An apparatus for installing a decryption key is initially arranged so that a decryption algorithm received by a control processor is passed via a first interface path to a decryption processor. The algorithm is installed in the decryption processor together with a program decryption key. The apparatus is subsequently arranged so that encrypted working decryption keys received by the control processor are passed on to the decryption processor over the first interface path. The decryption processor decrypts the encrypted keys using the program decryption key. Decryption keys are thus obtained and are transferred via a second interface path to decryptors for use in decrypting encrypted program signals input to the decryptors.Type: GrantFiled: July 9, 2001Date of Patent: April 10, 2007Assignee: Qualcomm, Inc.Inventors: Liat Ben-Zur, Curtis D. Mursfeldt, Christopher Wingert, Paul Pomes, Jesse Hose, Ann C. Irvine, Senthil Govindaswamy
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Publication number: 20070060086Abstract: The present invention encompasses a mobile station comprising a transmitter for transmitting outgoing signals from the mobile station and a receiver for receiving incoming signals, the receiver coupled to the transmitter and having N subreceivers, where N is an integer greater than one and each of the N subreceivers may independently be tuned to a desired frequency.Type: ApplicationFiled: November 1, 2006Publication date: March 15, 2007Applicant: QUALCOMM, INC.Inventors: Tao Chen, Seyfollah Bazarjani, Edward Tiedemann
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Patent number: 7187708Abstract: A buffer structure for storing symbols received via a number of (e.g., physical or transport) channels. Each channel is associated with a particular time interval (e.g., a radio frame period or a transmission time interval (TTI)) over which the received symbols are processed (e.g., interleaved). The buffer structure includes a buffer and an address generator. The buffer is partitioned into a number of sections. One section is assigned to each channel being processed. Each section can be operated as a circular buffer. The address generator provides addresses for writing symbols to the assigned sections. If the buffer structure is used for the transport channels, the sections can be assigned to the transport channels based on the associated TTIs (e.g., in descending order of TTIs). For each coded composite transport channel (CCTrCH), the transport channels in the CCTrCH can be assigned to sections defined starting from a respective initial location (e.g.Type: GrantFiled: October 3, 2000Date of Patent: March 6, 2007Assignee: Qualcomm Inc.Inventors: Da-Shan Shiu, Avneesh Agrawal