| Patent Number |
Title Of Patent |
Date Issued |
| 7567624 |
System and method of communicating using combined signal parameter diversity |
July 28, 2009 |
| A system and method of data communication uses variable transmit antenna delays based on communication signal uplink measurements. The signals for each channel are delayed at baseband, so different delays can be used for each channel. The delay between each antenna are preferably chosen |
| 7561618 |
Reconfigurable chip level equalizer architecture for multiple antenna systems |
July 14, 2009 |
| A system comprising a plurality of adaptive equalizers adapted to couple to a plurality of receive antennas, each of the antennas capable of receiving a multipath delay profile estimate (MDPE), control logic interconnecting at least some of the adaptive equalizers, and a control mech |
| 7555068 |
Producing control signals indicating transmit diversity and no transmit diversity |
June 30, 2009 |
| A circuit is designed with a measurement circuit (746) coupled to receive an input signal from at least one of a first antenna and a second antenna of a transmitter. The measurement circuit produces an output signal corresponding to a magnitude of the input signal. A control circuit (726 |
| 7502591 |
Multi-mode radio piconet/scatternet |
March 10, 2009 |
| A communication system 100 allows for heterogeneous piconets/scattenets 100 where in multiple modes 110, 112 of transmission, one of Bluetooth 110 and one or more other modes of transmission 112 are possible. While at the same time maintaining synchronization between all the different |
| 7440484 |
Reduced hopping sequences for a frequency hopping system |
October 21, 2008 |
| A frequency hopping system such as a Bluetooth system (300) can reduce the number of RF channels it hops during a normal hopping sequence cycle providing for a Reduced Hopping Sequence (RHS). A communication unit operating in the system such as the Bluetooth master unit (302) determi |
| 7372825 |
Wireless communications system with cycling of unique cell bit sequences in station communicatio |
May 13, 2008 |
| A wireless communication system (10). The system comprises transmitter circuitry (BST1) comprising circuitry for transmitting a plurality of frames to a receiver in a first cell (Cell 1). Each of the plurality of frames comprises a bit group (22), and the bit group uniquely distingui |
| 7349379 |
Channel normalization |
March 25, 2008 |
| Soft estimate normalization for weighted multiantenna high-order modulation data channel together with separate antenna pilot channels using averaging in first time slots of a transmission time interval with corrections for subsequent time slots. |
| 7302233 |
Multiuser detection for wireless communications systems in the presence of interference |
November 27, 2007 |
| System and method for detecting transmissions from multiple users in a digital wireless communications system in the presence of interference. A preferred embodiment comprises derotating a received signal by a specified amount, determining channel estimates, which can include the det |
| 7295636 |
Linear single-antenna interference cancellation receiver |
November 13, 2007 |
| System and method for interference cancellation in a digital wireless communications system. A preferred embodiment comprises sampling a received signal wherein the received signal is real-valued, rotating the sampled received signal by a specified amount, extracting in-phase and qua |
| 7295624 |
Wireless system with hybrid automatic retransmission request in interference-limited communicati |
November 13, 2007 |
| A wireless receiver for receiving signals from an interference-limited transmitter in an interference-limited system comprising at least one transmit antenna, wherein the signals comprise a plurality of symbols. The receiver comprises a plurality of receive antennas and collection ci |
| 7218894 |
Interferer detection and channel estimation for wireless communications networks |
May 15, 2007 |
| System and method for improving performance of digital wireless communications systems in the presence of interferers. A preferred embodiment comprises generating a list of hypotheses from a list of known interferers and timing offsets, receiving a signal transmitted over-the-air, co |
| 7218692 |
Multi-path interference cancellation for transmit diversity |
May 15, 2007 |
| The present invention provides an apparatus, system and method for removal of interference due to multi-path for multiple transmit antennas (hereinafter referred to as MTA-MPIC) for High Speed Downlink Packet Access (HSDPA) encoded for transmit diversity, such as Space-Time Transmit |
| 7218680 |
Retransmission techniques for enhanced performance in fading wireless communication channels |
May 15, 2007 |
| A desired bit sequence (x) can be communicated over a wireless communication link (15) by including the desired bit sequence in each of a plurality of transmissions over the wireless communication link. In response to each of the plurality of transmissions, a received bit sequence co |
| 7184458 |
Reduced subset scan and dual frequency wakeup for bluetooth inquiry operation |
February 27, 2007 |
| An inquiry message is transmitted successively on each of a first plurality of transmit frequencies (44 48) and thereafter successively on each of a second plurality of transmit frequencies (51), in order to ensure that a first wireless communication apparatus that listens on one of |
| 7184457 |
Spread spectrum path estimation |
February 27, 2007 |
| Spread spectrum rake receiver estimates number of paths within a chip interval and assigns corresponding fingers. Cross-correlation matrix eigenvalues or direct BER estimates for differing numbers of fingers determine whether one or two fingers assigned to the group of paths within a |
| 7181167 |
High data rate closed loop MIMO scheme combining transmit diversity and data multiplexing |
February 20, 2007 |
| Closed loop multiple-antenna wireless communications system with antenna weights determined by maximizing a composite channel signal-to-interference-plus-noise ratio minimum. Multiplexed symbol streams over subsets of antennas enhance throughput. |
| 7164704 |
Beam forming for transmit using bluetooth modified hopping sequences (BFTBMH) |
January 16, 2007 |
| A communication circuit (28) is designed with a signal processing circuit (370) arranged to produce a first plurality of data signals and receive a second plurality of data signals. A transmit circuit (364) is coupled to receive the first plurality of data signals and transmit each data |
| 7161941 |
Wireless packet communications with extended addressing capability |
January 9, 2007 |
| In packet communications, one existing address code in a predetermined address field (AM_ADDR) of a packet can be used to indicate that bits in another field (TYPE) of the packet represent additional address information. Additional address information can also be provided for by exte |
| 7154958 |
Code division multiple access wireless system with time reversed space time block transmitter di |
December 26, 2006 |
| A wireless communication network (10) includes a wireless transmitter having a plurality of antennas (AT1.sub.1, AT1.sub.2). The transmitter includes for each of a plurality of different user channels (D.sup.n), circuitry (22.sup.n) for providing a plurality of groups of symbols in a |
| 7133396 |
Dynamic assignment of retransmission slots for enhanced quality in wireless communication links |
November 7, 2006 |
| In wireless communication arrangements that utilize a transmission period of time followed by a retransmission period of time, the utilization and effectiveness of retransmission communications can be advantageously increased by dynamically assigning desired communications to respective |
| 7113499 |
Wireless communication |
September 26, 2006 |
| A wireless communication transmission channel estimation by initial data exchange to determine calibration factors to apply to tracked channel estimations from received transmissions. |
| 7058114 |
Wireless device and method |
June 6, 2006 |
| A high speed Bluetooth system with switch-to quadrature amplitude modulation allows for simple mobile devices with video data rates in applications such as Internet downloading. Mobile devices may have multiple antennas and adaptive hopping frequencies. |
| 7050402 |
Wireless communications with frequency band selection |
May 23, 2006 |
| A probe, listen and select (PLS) technique can be used to select from an available frequency spectrum a frequency band whose communication quality is suitable for wireless communication at a desired rate. Probe packets can be transmitted on different frequencies (223) during a known peri |
| 6975684 |
Dynamic slave frequency selection for improving uplink frequency hopping wireless communications |
December 13, 2005 |
| In wireless communications between a frequency hopping master device (M) and a frequency hopping slave device (S.sub.1), the slave-to-master transmission frequency can be dynamically selected from a plurality of previous master-to-slave transmission frequencies (33) based on quality |
| 6973117 |
Dynamic extension of frequency hopping patterns in wireless communications |
December 6, 2005 |
| In a duplex link (40, 60, 90, 116) coupling first and second frequency hopping wireless communication devices, either or both of the frequency hopping patterns that are respectively used in the downlink and the uplink can be selectively and dynamically extended. Extension of the frequenc |
| 6970495 |
Adjustment of slave frequency hopping pattern to improve channel measurement opportunities in wi |
November 29, 2005 |
| The frequency hopping pattern of a first wireless communication device is modified such that each transmission (73) to a second wireless communication device is on a frequency (MS.sub.j+1) that the second device's normal frequency hopping pattern specifies for one of the second devic |
| 6970440 |
Enhanced performance in frequency hopping wireless communications by combining frequency dwellin |
November 29, 2005 |
| In wireless communications between first and second frequency hopping wireless communication devices, both devices can dwell on a single selected frequency (f.sub.11) for selected types of data transmissions such as large data bursts and data requiring an enhanced quality of service. |
| 6965590 |
Dynamic slave selection in frequency hopping wireless communications |
November 15, 2005 |
| Based on monitored quality of various frequency channels between first and second frequency hopping wireless communication devices, communications between the first and second devices can be scheduled with respect to a predetermined frequency hopping pattern such that communications are |
| 6917597 |
System and method of communication using transmit antenna diversity based upon uplink measuremen |
July 12, 2005 |
| A system and method of data communication uses variable transmit antenna delays based on uplink measurements for the time division duplex (TDD) mode of WCDMA communication. The signals for each channel are delayed at baseband, so different delays can be used for each channel. The delay |
| 6856610 |
Wireless code division multiple access communications system with channel estimation using finge |
February 15, 2005 |
| A wireless communication network (10). The network comprises a wireless receiver (14). The receiver comprises at least one antenna (AT.sub.14) for receiving a plurality of frames in a form of a plurality of paths. Each of the plurality of frames is modulated by a plurality of chips, and |
| 6839325 |
Wireless communication system which uses ARQ packets to ACK a plurality of packets from an 802.1 |
January 4, 2005 |
| Automatic repeat request (ARQ) operations can be implemented in wireless communications by sending (2401) a plurality of data packets in a superpacket, and responding (2430) with an acknowledgement packet that indicates which packets of the superpacket require retransmission. |
| 6834046 |
Acquisition of an unevenly spaced synchronization channel in a wireless communication system |
December 21, 2004 |
| A method (70) of operating a wireless receiver (UST). The method receives a wireless communicated signal, wherein the signal comprises asymmetrically spaced synchronization channel components. The method also defines (72) a set of signals from the communicated signal, wherein the set spa |
| 6831956 |
Wireless communications system with combining of multiple paths selected from sub-windows in res |
December 14, 2004 |
| A wireless receiver (UST). The receiver comprises at least one antenna (ATU) for receiving a plurality of frames (FR) in a form of a plurality of paths. Each of the plurality of frames comprises a plurality of time slots (SL.sub.N), and each of the plurality of time slots comprises a plu |
| 6829290 |
Wireless communications system with combining of multiple paths selected from correlation to the |
December 7, 2004 |
| A wireless receiver (UST). The receiver comprises at least one antenna (ATU) for receiving a plurality of frames (FR) in a form of a plurality of paths. Each of the plurality of frames comprises a plurality of time slots (SL.sub.N), and each of the plurality of time slots comprises a plu |
| 6816541 |
Spread spectrum interference cancellation |
November 9, 2004 |
| Iterative parallel interference cancellation estimations for signals received from multiple coded sources or a source with multiple coded outputs with updated estimates of interfering signals used during an iteration. |
| 6801567 |
Frequency bin method of initial carrier frequency acquisition |
October 5, 2004 |
| A frequency bin method of carrier frequency acquisition uses a plurality of predetermined carrier frequency offset bins. A single bin is selected from among the plurality of bins. A local VCO is then adjusted to remove the carrier frequency offset associated with the single selected bin. |
| 6798737 |
Use of Walsh-Hadamard transform for forward link multiuser detection in CDMA systems |
September 28, 2004 |
| A station capable of receiving information containing Walsh coding for a plurality of channels and canceling interference from the received information and the method of cancellation. A memory is provided for storing received signals containing a Walsh code for each of a plurality of |
| 6775260 |
Space time transmit diversity for TDD/WCDMA systems |
August 10, 2004 |
| A circuit is designed with a matched filter circuit including a plurality of fingers (700, 702, 704) coupled to receive a data symbol. Each finger corresponds to a respective path of the data symbol. Each finger produces a respective output signal. A plurality of decoder circuits (706, 7 |
| 6728302 |
STTD encoding for PCCPCH |
April 27, 2004 |
| A circuit is designed with a measurement circuit (746) coupled to receive an input signal from at least one of a first antenna and a second antenna of a transmitter. The measurement circuit produces an output signal corresponding to a magnitude of the input signal. A control circuit (726 |
| 6725025 |
Interference cancellation among wireless units using Gibbs sampling |
April 20, 2004 |
| An improved interference cancellation technique is disclosed. Digital baseband circuitry (40) includes user and symbol detection circuitry (50) for performing a Gibbs sampler type of interference cancellation, either embodied in custom hardware (44) or in software. Random initial guesses |
| 6714774 |
Antenna reception diversity in wireless communications |
March 30, 2004 |
| Antenna reception diversity is provided for wireless communications such that a received signal (r) can be produced by combining antenna signals (v.sub.i) with their associated fading amplitudes (.alpha..sub.i) as estimated by a linear receiver (32). Also, antenna signals (v1.sub.i) can |
| 6603412 |
Interleaved coder and method |
August 5, 2003 |
| Quasi-parallel read/write interleaver architecture for data blocks by sequential spreading of variable size data subblocks into memory banks with bank address contention initiating the next data subblock. Iterative Turbo decoders with MAP decoders use such quasi-parallel interleavers and |
| 6597729 |
Joint position and carrier frequency estimation method of initial frequency acquisition for a WC |
July 22, 2003 |
| A WCDMA system and method of data communication allows a receiver to reliably achieve carrier frequency acquisition following turn-on without use of temperature compensation. Initial frequency acquisition is achieved by estimating the signal path position having the largest magnitude and |
| 6546055 |
Carrier offset determination for RF signals having a cyclic prefix |
April 8, 2003 |
| A method of determining an integral portion of a carrier offset .DELTA.f.sub.c of an RF signal transmitted from a transmitter at a transmit carrier frequency f.sub.ct and an apparatus for carrying out the method. The signal consists of at least two data symbols S.sub.1 and S.sub.2, e |
| 6424642 |
Estimation of doppler frequency through autocorrelation of pilot symbols |
July 23, 2002 |
| A circuit coupled to receive a sequence of signals is designed with a multiplication circuit (416, 420) coupled to receive a first signal, a second signal and a complex conjugate of the first signal. The second signal follows the first signal in time. The multiplication circuit produ |
| 6404826 |
Iterative signal-to-interference ratio estimation for WCDMA |
June 11, 2002 |
| A circuit is designed with an estimate circuit (132) coupled to receive a plurality of predetermined signals (416-418) from an external source. Each of the predetermined signals is spaced apart in time. The estimate cit produces a first estimate signal in response to at least one of the |
| 6385633 |
Method and apparatus for computing complex phase |
May 7, 2002 |
| The phase of a complex number I+jQ is computed using a hybrid lookup table and computation approach suitable for DSP implementation and useful in remote access/networking and wireless applications. An approximate phase .theta..about. for an approximation complex number I.about.+jQ.about. |
| 6331975 |
User data indicator for discontinuous transmission |
December 18, 2001 |
| A communication circuit is designed with a processing circuit (11) coupled to receive a plurality of first control signals (40-45) and a second control signal (46) from a source external to the communication circuit during a predetermined time (49). The plurality of first control signals |
| 6166622 |
Time slot structure for improved TPC estimation in WCDMA |
December 26, 2000 |
| A communication circuit is designed with a processing circuit (11) coupled to receive a plurality of first control signals (402, 408) from a source external to the communication circuit. The processing circuit produces a second control signal (432, 434) and a second power control (422, 4 |
