Patents Represented by Attorney Brian R. Short
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Patent number: 7688808Abstract: An apparatus and method of a mobile access node selecting a routing path through a mesh network is disclosed. The method includes receiving routing packets from at least one upstream access node, the routing packets including information of at least one upstream access node along a path to a gateway access node. A weight is assigned to each received routing packet, wherein the weight is dependent on how recently the routing packet is received. A packet success rate is calculated for each upstream access node by summing routing packets weights over a period of time for each upstream access node. The mobile node selecting the routing path through one of the at least one upstream access node based upon the packet success rate of routing packets received from each upstream access node.Type: GrantFiled: March 21, 2006Date of Patent: March 30, 2010Assignee: Tropos Networks, Inc.Inventors: Wenge Ren, Amalavoyal Chari
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Patent number: 7672396Abstract: Methods of reducing spectral leakage due to I-Q imbalance within a transmitter are disclosed. The method includes the transmitter receiving a data stream of coefficients of a multi-carrier modulation signal. The data stream is pre-processed by processing a set of the coefficients that correspond with selected notch frequencies to reduce the effects of I-Q imbalance of the transmitter, wherein at least a portion of the set of coefficients corresponds to non-symmetrical notch frequencies. The pre-processed data stream is multi-carrier modulated. The multi-carrier modulated pre-processed data stream is I-Q modulated before transmission.Type: GrantFiled: June 22, 2006Date of Patent: March 2, 2010Assignee: NDSSI Holdings, LLCInventors: Adam L. Schwartz, Sujai Chari
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Patent number: 7649866Abstract: Disclosed is an apparatus and method of client device roaming from a home subnet to a foreign subnet of a network. The method includes the client device accessing the network through a first access node of the home subnet, and the client device roaming to a second access node of the foreign subnet, the client device accessing the network through the second access node, the client device maintaining a fixed client IP address, default gateway IP address and IP subnet attachment as the client device roams from the first access node to the second access node.Type: GrantFiled: November 24, 2004Date of Patent: January 19, 2010Assignee: Tropos Networks, Inc.Inventors: Amalavoyal Chari, Devabhaktuni Srikrishna, John Zhuge
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Patent number: 7646699Abstract: A device and method of setting transmit power backoff of a transceiver within a network is disclosed. The method includes estimating a channel loss of a channel of the transceiver, obtaining channel loss information, the channel loss information including estimates of channel loss of other channels of the network, obtaining crosstalk information, the crosstalk information including estimates of crosstalk between the channel and other channels of the network, and setting the power backoff based on the channel loss of the channel, the channel information, and the crosstalk information.Type: GrantFiled: December 16, 2005Date of Patent: January 12, 2010Assignee: Teranetics, Inc.Inventors: Jose Tellado, Sanjay Kasturia
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Patent number: 7634710Abstract: Embodiments of a method and apparatus for decoding signals are disclosed. The method includes receiving modulated signals, generating bits representing the signals, and associated reliability of each bit. The method further includes executing a first stage of decoding the bits using a first component code, and simultaneously executing the first stage of decoding again using a second component code, and executing a second stage of decoding using the first component code. The first and second stages of decoding are used to generate the bit stream. Another method includes receiving modulated signals, generating bits representing the signals, and associated reliability of each bit. The method further includes executing a first stage of N stages for decoding the bits, the first stage using a first of M component codes, and simultaneously executing a plurality of the N stages of decoding, each of the plurality of N stages using a different one of the M component codes.Type: GrantFiled: July 10, 2008Date of Patent: December 15, 2009Assignee: Teranetics, Inc.Inventors: Dariush Dabiri, Nitin Barot
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Patent number: 7602334Abstract: A method and apparatus of a mobile subscriber (MS) estimating position are disclosed. One method includes the MS receiving at least one satellite transmitted signal with a first receiver, and estimating a time of arrival of the at least one satellite transmitted signal. The MS additionally receives at least one terrestrial base station signal with a second receiver, and estimates a time of arrival of the at least one terrestrial base station signal. The MS estimates its position based on the estimated time of arrival of the at least one satellite transmitted signal and the estimated time of arrival of the at least one terrestrial base station signal.Type: GrantFiled: April 3, 2008Date of Patent: October 13, 2009Assignee: BECEEM Communications Inc.Inventor: Robert G. Lorenz
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Patent number: 7586879Abstract: A method that includes a client roaming from the first access node to a second access node is disclosed. The second wireless access node detects the client seeking access to the system. The second wireless access node is able to connect to the backbone network. Client information is obtained. The second wireless node provides the client a communication path to and from the destination. The communication path is able to include wired and wireless communication links. Routing of information through the communication path between the client and the destination is aided based upon detection of the client. The wireless connection between the second access node and the backbone network can include at least one wireless hop between the second access node and a fourth access node.Type: GrantFiled: January 17, 2006Date of Patent: September 8, 2009Assignee: Tropos Networks, Inc.Inventors: Amalavoyal Chari, Devabhaktuni Srikrishna
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Patent number: 7580393Abstract: An apparatus and method of a method of an access point determining whether to transmit a response to a client device probe request is disclosed. The method includes the access point receiving a probe request from a client device. The access point determines a quality of a link between the access point and the client device based on the probe request. The access point sets a delay time for transmitting a probe response to the probe request depending upon the quality of the link.Type: GrantFiled: October 2, 2006Date of Patent: August 25, 2009Assignee: Tropos Networks, Inc.Inventors: Huizhao Wang, Roman M. Arutyunov
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Patent number: 7580705Abstract: A wireless access node is disclosed. The wireless access node includes a primary CPU for controlling wireless data transmission and reception, of the wireless access node with other access nodes. A secondary controller provides alternate control of the wireless access node. The secondary controller is separately controllable by a system operator.Type: GrantFiled: October 11, 2005Date of Patent: August 25, 2009Assignee: Tropos Networks, Inc.Inventor: Dev Kumar
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Patent number: 7564862Abstract: Embodiments for assigning channels to links of a node of a mesh network are disclosed. One embodiment includes a method of assigning channels to links of a node of a mesh network, wherein the mesh network includes the node and an upstream node. The method includes assigning a first channel to an uplink of the node, assigning a second channel to a downlink of the node, and maintaining the first channel and the second channel distinct from an uplink channel of the upstream node. The first channel and the second channel assignments for the node can be based on a number of hops from the node to a distinguished node.Type: GrantFiled: March 7, 2005Date of Patent: July 21, 2009Assignee: Tropos Networks, Inc.Inventors: Devabhaktuni Srikrishna, Amalavoyal Chari, Cyrus Behroozi
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Patent number: 7564781Abstract: An apparatus and method of determining throughput between a first host and a second host of at least one network is disclosed. The method includes the first host intentionally corrupting ICMP packets by manipulating a checksum of the ICMP packets. The first host sends the corrupted ICMP packets to the second host through the at least one network. The first host additionally sends non-corrupted ICMP packets to the second host. Based on responses from second host to the ICMP packets, the first host estimates a throughput between the first host and the second host. The throughput includes a first direction throughput from the first host to the second host, a second direction throughput from the second host to the first host, and a round trip throughput between the first host and the second host.Type: GrantFiled: November 16, 2005Date of Patent: July 21, 2009Assignee: Tropos Networks, Inc.Inventor: Sam Song Liang
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Patent number: 7551562Abstract: The invention includes an apparatus and method for communicating link quality information between access nodes. A first step includes a first access node transmitting first routing packets. A second step includes a second access node receiving at least one of the first routing packets over a first direction of a first link. A third step includes the second access node transmitting second routing packets. A fourth step includes the first access node receiving at least one of the second routing packets over a second direction of the first link, and determining a first direction link quality of the first link based upon the second routing packets.Type: GrantFiled: October 19, 2004Date of Patent: June 23, 2009Assignee: Tropos NetworksInventors: Devabhaktuni Srikrishna, Amalavoyal Narasimha Chari, B. William Hong, Roman Arutyunov
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Patent number: 7542421Abstract: A method of optimizing link transmission parameters between access nodes within a mesh network is disclosed. The method includes each access node within the mesh transmitting packets at N different combinations of data rates and power levels. Each receiving node that receives the data packets at one or more of the N combinations, selects a most desirable one of the received combinations. The receiving nodes indicate to the transmitting nodes the selected most desired combination for transmitting to the receiving node.Type: GrantFiled: September 9, 2005Date of Patent: June 2, 2009Assignee: Tropos NetworksInventors: Devabhaktuni Srikrishna, Amalavoyal Chari, Cyrus Behroozi
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Patent number: 7505426Abstract: A method of selecting at least one routing path between and access node and a gateway is provided. The method includes the access node receiving over a plurality of channels, indicators from at least one upstream access node, the indicators providing information of selected upstream paths between each of the upstream access nodes and upstream gateways. The access node determines an optimal set of routing paths between the access node and at least one upstream gateway, based upon the indicators, the optimal set of routing paths including a combination of paths over multiple channels.Type: GrantFiled: April 2, 2004Date of Patent: March 17, 2009Assignee: Tropos NetworksInventors: Devabhaktuni Srikrishna, Amalavoyal Chari
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Patent number: 7499409Abstract: A method of verifying a mesh network is disclosed. The method includes identifying wireless links from a set of selected mesh network routing links, that have a link quality below a predetermined quality threshold, and providing a network manager with a link list that lists and prioritizes the identified wireless links according to a degree of impact each identified wireless link has on performance of the mesh network. Determining the degree of impact of each identified wireless link can include determining an amount the mesh network relies upon identified wireless link. Mesh network reliance can be dependent on how many routes through the mesh network include the identified wireless link. Determining the degree of impact of each identified wireless link can include determining a link quality of the identified wireless link.Type: GrantFiled: April 29, 2005Date of Patent: March 3, 2009Assignee: Tropos Networks, Inc.Inventors: Devabhaktuni Srikrishna, Cyrus Behroozi
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Patent number: 7489932Abstract: Embodiments of methods of assigning a channel to a link of an access node within a wireless mesh network, is disclosed. The method includes the access node receiving beacons over multiple channels, from at least one upstream device, and the access node selecting an uplink channel based upon the received beacons. Additional methods include the access node selecting a downlink channel so that different channels are assigned to consecutive links within a data path between a gateway and a down stream device. The different channels can include non-overlapping channels, or a combination of non-overlapping and at least partially overlapping channels. The method can further include selecting a downstream link channel based upon predetermined sequences of channel selections, and a hop count of the access node.Type: GrantFiled: June 3, 2004Date of Patent: February 10, 2009Assignee: Tropos NetworksInventors: Amalavoyal Chari, Cyrus Behroozi, Devabhaktuni Srikrishna
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Patent number: 7480515Abstract: A device and method for of synchronizing a MAC superframe of a wireless device is disclosed. The wireless device can be located within a chain of a plurality of other wireless devices. The method includes receiving beacons from at least one other device during a superframe of the wireless device, determining a superframe offset for each of the other wireless devices based on timing of the received beacons, determining a corrective delay based on the superframe offsets, inserting the corrective delay within a current superframe of the wireless device, and inserting a predictive delay within the current superframe, the predictive delay being determined by an estimate of a difference between a frequency a clock of the wireless device and a frequency of a slowest clock of the other wireless devices within the chain.Type: GrantFiled: September 29, 2005Date of Patent: January 20, 2009Assignee: Tzero Technologies, Inc.Inventors: Patrick Worfolk, Xiaoming Zhou
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Patent number: 7466746Abstract: An device and method for a pre-sampling processing is disclosed. The pre-sampling device includes a single amplifier having a virtual ground node, and a feed back circuit connected from an output of the amplifier to the virtual ground node. The feed back circuit includes a plurality of switches connected to the virtual ground node. The switches control a plurality of programmable gain settings. The feed back circuit also includes an adjustable current source that is adjusted according to an estimated echo signal. A current of the adjustable current source is summed at the virtual ground node. The feed back circuit also includes a low pass filter that is tuned to suppress received signal frequencies above a fraction of a sampling frequency of a sampler connected to the pre-sampling device.Type: GrantFiled: June 9, 2005Date of Patent: December 16, 2008Assignee: Teranetics, Inc.Inventor: Sandeep Kumar Gupta
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Patent number: 7461328Abstract: Embodiments of a method and apparatus for decoding signals are disclosed. The method includes receiving modulated signals, generating bits representing the signals, and associated reliability of each bit. The method further includes executing a first stage of decoding the bits using a first component code, and simultaneously executing the first stage of decoding again using a second component code, and executing a second stage of decoding using the first component code. The first and second stages of decoding are used to generate the bit stream.Type: GrantFiled: March 25, 2005Date of Patent: December 2, 2008Assignee: Teranetics, Inc.Inventors: Dariush Dabiri, Nitin Barot
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Patent number: 7460489Abstract: Methods and systems are disclosed for managing a network. The management includes storing configuration parameters in cells within the network, sending a commit command and a commit delay time to the cells, sensing failed reception of the commit command, and aborting the commit command if a failure is sensed.Type: GrantFiled: July 21, 2004Date of Patent: December 2, 2008Assignee: Tropos Networks, Inc.Inventors: Ridwan (Peter) G. Sugiarto, Devabhaktuni Srikrishna