| Patent Number |
Title Of Patent |
Date Issued |
| 7418042 |
Repetition coding for a wireless system |
August 26, 2008 |
| Data is transmitted over a wireless channel. Convolutionally encoded data is received and the data is repetition encoding where a repetition rate associated with the repetition encoding is set to one of a plurality of possible rates. In some embodiments, data is repeated in the frequency |
| 7414555 |
Interleaved ADC and folded mixer for WLAN devices |
August 19, 2008 |
| An interleaved ADC can advantageously provide synchronous sampling and time-multiplexed output. Differential I and Q input signals can first be stored by charging a plurality of capacitors. These stored differential signals can be buffered in a time-multiplexed sequence. For example, |
| 7400733 |
Key refresh at the MAC layer |
July 15, 2008 |
| A method for encrypted communications between a first transceiver and a second transceiver is provided. The method includes sending from a first transceiver to a second transceiver a request to initiate derivation of a new encryption key. The request to initiate a new encryption key |
| 7400691 |
Power control on a packet-by-packet basis in a CMOS transceiver |
July 15, 2008 |
| A transceiver includes a power control circuit in the transmitter that operates on a packet-by-packet basis. The transceiver can, for each packet, set a variable gain amplifier to a first gain and use predetermined gain increments to thereafter increase gain until a gain hold event. |
| 7397859 |
Multi-carrier communication systems employing variable symbol rates and number of carriers |
July 8, 2008 |
| A multi-carrier communication system such as an OFDM or DMT system has nodes which are allowed to dynamically change their receive and transmit symbol rates, and the number of carriers within their signals. Changing of the symbol rate is done by changing the clocking frequency of the |
| 7386063 |
Voting block for identifying WLAN signal modulation type |
June 10, 2008 |
| A WLAN device operating in an 802.11g mode can receive signals of different modulations. A technique is provided that quickly and accurately identifies signals of different modulation types when received by the WLAN device. This technique includes beginning demodulation of the receiv |
| 7385929 |
Method and system for detecting false packets in wireless communications systems |
June 10, 2008 |
| Specific bits of an incoming transmission are compared against a predetermined bit pattern. If the selected bits do not match the predetermined bit pattern, then the incoming transmission is rejected as a false packet. The predetermined bit pattern can include legal values for predet |
| 7385914 |
Apparatus and method of multiple antenna transmitter beamforming of high data rate wideband pack |
June 10, 2008 |
| The present invention provides an apparatus and method of multiple antenna transmitter beamforming of high data rate wideband packetized wireless communication signals, where each of the signals comprises N frequencies, where N is a positive integer. The apparatus, in an exemplary embodi |
| 7385432 |
Commutating phase selector |
June 10, 2008 |
| A phase selector for selecting a differential output is provided. The phase selector can include two matched transistor circuits. A first transistor circuit can receive a first differential input signal whereas a second transistor circuit can receive a second differential input signa |
| 7369510 |
Wireless LAN using RSSI and BER parameters for transmission rate adaptation |
May 6, 2008 |
| Dynamic conditions present in a channel can quickly degrade signal quality, thereby reducing the data rate usable by a WLAN transmitter. For maximum throughput, the highest, reliable data rate available should be used. In accordance with one feature of an adaptive rate technique, a l |
| 7366089 |
Apparatus and method of multiple antenna receiver combining of high data rate wideband packetize |
April 29, 2008 |
| The present invention provides an apparatus and method of multiple antenna receiver combining of high data rate wideband packetized wireless communication signals, where the apparatus includes M receive antennas, receiving M high data rate wideband packetized wireless communication s |
| 7353010 |
Techniques for fast automatic gain control |
April 1, 2008 |
| An automatic gain control (AGC) technique can quickly sense signal size over a large dynamic range by using a peak detector block in the analog portion of the receiver. The peak detector block can compare a received signal to predetermined thresholds (chosen to divide a potential signal |
| 7352733 |
Implementing location awareness in WLAN devices |
April 1, 2008 |
| An ambient country identifier (ACI) signal can be used to automatically provide location awareness for a WLAN device. If an ACI signal is detected, then the WLAN device can configure itself to comply with channel and power settings for the country having the detected ACI signal. Afte |
| 7349503 |
Adaptive interference immunity control |
March 25, 2008 |
| Wireless local area networks must work in less than ideal environments, including environments having externally and internally generated interfering RF signals. Interfering signals can cause significant problems with signal detecting, amplifier gain adjustment, and signal decoding. |
| 7340265 |
Method and apparatus for transient frequency distortion compensation |
March 4, 2008 |
| Transient distortion is compensated for by multiplying an exponentially-decaying phase shift onto the distorted waveform. The exponentially decaying phase shift waveform is patterned after the transient which typically takes the form of an exponential and occurs upon introduction of |
| 7330524 |
Joint synchronization and impairments estimation using known data patterns |
February 12, 2008 |
| Synchronization and impairment estimations can be performed jointly, thereby saving valuable time for decoding of the received packet. An initial synchronization in a TDMA system can be performed. Using this synchronization, the frequency offset choices and timing offset choices can |
| 7321631 |
Spur mitigation techniques |
January 22, 2008 |
| Spurs cause significant problems with signal detecting, amplifier gain adjustment, and signal decoding. Various techniques can be used to mitigate the effects of spurs on a received signal. Generally, these techniques work by either canceling or ignoring the spurs. For example, a pil |
| 7319867 |
Method and apparatus for wake on wireless systems |
January 15, 2008 |
| A method and apparatus to wirelessly control network devices is described. In one embodiment, a wireless device is used to control at least one host device using a network. In one aspect, a wireless device receives and determines a response to network control signals received thereto. In |
| 7274911 |
System and method of conforming wireless devices to worldwide regulations |
September 25, 2007 |
| Countries or regions of the world can have different regulations governing wireless devices. A client product advantageously conforms to any regulatory environment, thereby allowing the client product to operate permissibly in any wireless network. The client product scans all freque |
| 7257723 |
Reducing power consumption in embedded systems by controlling voltage based on system state and |
August 14, 2007 |
| An embedded system optimally operates with minimal power consumption without sacrificing performance. Power consumption can be reduced by independently and dynamically controlling multiple power partitions, wherein components within a partition can have the same power profile. States |
| 7251459 |
Dual frequency band wireless LAN |
July 31, 2007 |
| A dual band radio is constructed using a primary and secondary transceiver. The primary transceiver is a complete radio that is operational in a stand alone configuration. The secondary transceiver is a not a complete radio and is configured to re-use components such as fine gain con |
| 7245893 |
Method and system for noise floor calibration and receive signal strength detection |
July 17, 2007 |
| A system for detecting the level of the noise floor due to circuit noise as seen at the ADC for a wireless receiver. The system measures power after digitizing and filtering, and subtracts off any variable gain used in the analog front end to determine differentially the size of the |
| 7245882 |
Method and apparatus for a signal selective RF transceiver system |
July 17, 2007 |
| Method and apparatus to dynamically configure the signal reception selectivity of a plurality of transceivers is described. In one embodiment, a transceiver includes a receiver circuit having two or more filter circuits. Each of the filter circuits is configured to pass RF signals fr |
| 7242274 |
Inductor layout using step symmetry for inductors |
July 10, 2007 |
| A differential circuit layout can advantageously use step symmetry for inductors and mirror symmetry for the rest of the circuit. Interconnect segments can be used to connect the terminals of the inductors to other components in the circuit. These interconnect segments facilitate the |
| 7233205 |
Transistor biasing independent of inductor voltage drop |
June 19, 2007 |
| A differential amplifier can include input transistors for receiving a differential input signal and an inductor connected to the input transistors. The inductor can protect a voltage supply from radio frequency in the differential input signal. The accuracy of this differential ampl |
| 7231224 |
Cable having embedded access points |
June 12, 2007 |
| A cable has miniaturized, low-cost, highly-integrated wireless network access points embedded in the cable at periodic intervals along the length of the cable. Power conductors that run the length of the cable supply each of the access points with electrical power. Each access point |
| 7212788 |
Method and apparatus for signal power loss reduction in RF communication systems |
May 1, 2007 |
| Multiple power amplifiers in an RF front end are coupled to multiple antennas without diversity switching between the PAs and antennas. Diversity switches direct signals to broadcast by a selected antenna to a PA coupled to the selected antenna. Multiple LNAs are similarly coupled to |
| 7203255 |
Method and system to implement non-linear filtering and crossover detection for pilot carrier si |
April 10, 2007 |
| Systems and methods for correcting phase ambiguity in a total pilot phase value are presented. Examples include comparing and correcting total pilot phase values having different pilot frequencies within the same sampling interval, such as the same data symbol. Another example includes |
| 7185196 |
Key caching system |
February 27, 2007 |
| A key-caching system retrieves actively used keys from a relatively fast cache memory for fast processing of wireless communications. Additional keys are stored in relatively slow system memory that has high storage capacity. As keys become needed for active use, the keys are retrieved |
| 7185036 |
Look up table based upsampling and digital filtering |
February 27, 2007 |
| A system and method are disclosed for processing a signal that includes receiving encoded data including a plurality of input symbols; generating an input symbol set from the plurality of input symbols; looking up a plurality of output samples for the input symbol set; and outputting the |
| 7184495 |
Efficient pilot tracking method for OFDM receivers |
February 27, 2007 |
| A method for maintaining an accurate channel estimate. The method includes providing a reference channel estimate based on at least one long training symbol, and generating a frequency domain representation of a first data symbol including a plurality of pilots. The method then inclu |
| 7171184 |
Method and apparatus for a gain controlled mixer |
January 30, 2007 |
| A gain controlled mixer for an integrated CMOS transceiver. Accuracy of the controlled gain may be relatively invariant over temperature, manufacturing process, and other variations attendant to circuit realizations in a CMOS transceiver, and other realizations. A plurality of substa |
| 7170953 |
Method and apparatus for a transceiver having a constant power output |
January 30, 2007 |
| The present invention includes a transceiver and a method of operating the same that includes in the transmitter a power control circuit that operates on an analog differential signal containing data packets individually. The power control circuit initially transmits a series of data |
| 7161955 |
Modified start frame delimiter detection |
January 9, 2007 |
| A modified approach to detecting the start frame delimiter (SFD) is disclosed. A receiving system scans a decoded but not yet de-scrambled received signal for a scrambled version of the SFD associated with the preamble format being used. Using this approach, it is not necessary to us |
| 7158586 |
Systems and methods to provide wideband magnitude and phase imbalance calibration and compensati |
January 2, 2007 |
| Systems and methods for passively calibrating and correcting for I/Q mismatch in a quadrature receiver without the necessity of modifying the analog portion of the receiver by adding calibration signals or correction circuitry are presented. The passive I/Q mismatch calibration syste |
| 7158542 |
Dynamic preamble detection |
January 2, 2007 |
| A system and method are disclosed for dynamic preamble detection. A subset of the bits comprising the synchronization portion of the preamble are decoded, de-scrambled, and analyzed to determine dynamically which preamble format is being used. The source data values for the synchroni |
| 7133958 |
Multiple personality I/O bus |
November 7, 2006 |
| To efficiently personalize multiple bus interfaces, an input/output (I/O) integrated circuit (IC) is provided. This I/O IC can include two local bus control blocks, wherein each local bus control block can be configured to provide a selected personality. The selected personality can |
| 7132865 |
Mitigating parasitic current that leaks to the control voltage node of a phase-locked loop |
November 7, 2006 |
| Parasitic current at the control voltage node of a phase-locked loop (PLL) can significantly reduce performance of the PLL. Off-state transistors in either the charge pump or the filter can cause this parasitic current. A method of canceling a parasitic current generated by the charge pu |
| 7130646 |
Positioning with wireless local area networks and WLAN-aided global positioning systems |
October 31, 2006 |
| Accurate position capability can be quickly provided using a Wireless Local Area Network (WLAN). When associated with a WLAN, a wireless device can quickly determine its relative and/or coordinate position based on information provided by an access point in the WLAN. Before a wireless |
| 7130225 |
Charge pump with large bypass capacitors |
October 31, 2006 |
| A charge pump can advantageously include a PMOS transistor that functions as a first current source and an NMOS transistor that functions as a second current source. The transistors can be appropriately sized to provide low parasitic charge injection. Capacitors can function as low i |
| 7129884 |
Multiple antenna radar signal detection and estimation |
October 31, 2006 |
| A radar detection technique in a WLAN device can include a short pulse detection technique and a long pulse detection technique that can be performed using multiple receive chains. Short pulse detection is particularly effective when the incoming signal includes one or a limited numb |
| 7123670 |
Fine frequency offset estimation and calculation and use to improve communication system perform |
October 17, 2006 |
| A method for correcting influence of frequency offset between a receiver and a transmitter by evaluating training symbols received during a preamble period. The method includes producing, based on at least one long training symbol, a first vector whose first vector angle is indicativ |
| 7123106 |
Frequency offset correction techniques for crystals used in communication systems |
October 17, 2006 |
| A method and system for pulling a crystal frequency are provided, thereby allowing wireless stations to use less accurate crystal oscillators and dramatically reduce cost. A first frequency offset can be determined using a temperature-based method. This temperature-base method can in |
| 7120166 |
Scalable communication system using overlaid signals and multi-carrier frequency communication |
October 10, 2006 |
| A communication system such as an OFDM or DMT system has nodes which are allowed to transmit continuously on one or just a few of the system's frequency sub-channels, while the other nodes avoid putting any signal into those sub-channels. Simple low data rate nodes are allowed to use a |
| 7113559 |
Efficient methods for filtering to avoid inter-symbol interference and processing digital signal |
September 26, 2006 |
| A circular filtering system that prevents the problem of inter-symbol interference. The circular filtering system utilizes a buffer memory to store samples of a given symbol and provide only these samples to a linear filter such that the output of the filter, for any given symbol is |
| 7103314 |
System and method of conforming wireless devices to worldwide regulations |
September 5, 2006 |
| Countries or regions of the world can have different regulations governing wireless devices. A client product advantageously conforms to any regulatory environment, thereby allowing the client product to operate permissibly in any wireless network. The client product scans all freque |
| 7103116 |
Detection of a false detection of a communication packet |
September 5, 2006 |
| A method for detecting a false detection of a packet. The method includes generating a frequency domain representation of a signal, the frequency domain representation including a plurality of complex values each of which is associated with a subcarrier. The method also includes dete |
| 7098821 |
Receiving and transmitting signals having multiple modulation types using sequencing interpolato |
August 29, 2006 |
| In a wireless local area network (WLAN), receiving or transmitting signals having multiple modulation schemes can require the use of multiple clock rates. Providing these multiple clock rates significantly increases silicon area and power consumption, both of which are highly undesirably |
| 7091791 |
Transformer implementation using bonding wires |
August 15, 2006 |
| The use of the magnetic coupling between bonding wires can be advantageously used to transform a differential signal to a single-ended signal. Because bonding wires are very good conductors, this differential to single-ended signal transformation can be performed with minimal signal |
| 7091784 |
Tunable circuit including a switchable inductor |
August 15, 2006 |
| The frequency of a differential circuit can be advantageously adjusted using a switchable inductor. Specifically, the switchable inductor allows a base inductance to be increased by activating one of a plurality of inductor stages. A switch in an inductor stage can be opened to activate |
