Abstract: A joint set of linear precoder designs is provided for single cell uplink multiuser space-time block coded multiple-input multiple-output (MIMO) systems with multi-packet reception by exploiting outdated channel state information. By deriving the pairwise error probability with respect to both minimum and average codeword distance design metrics, the technique solves an optimization problem subject to transmit power constraint for each user and dependent on the outdated channel state information. Due to the non-convex nature of the optimization problem, an iterative technique based on alternating minimization and projected gradient can be used to solve for a joint linear preceding structure for general space-time block coding. The linear precoding structure is then sent from the base station to various consumer premise equipment for use in later transmissions. For orthogonal space-time block code, a simplified distributed technique is provided to solve for a closed-form solution of the optimization problem.

Abstract: Mobile devices, mobile device systems and methods applying to mobile devices are provided that employ intelligent agents in combination with a wide array of remote utilities and information sources to facilitate improving a mobile device user's experience. By collecting contextual information from numerous information sources related to the mobile device user's context, more accurate and optimized determinations and/or inferences are formed relating to which remote utilities to make available to the mobile device user. This facilitates less confusion for the user in selecting desired mobile device content, services, and/or applications. The devices, systems, and methodologies also provide for an improved user experience in an open remote utility provider model.

Abstract: A transmission protocol is provided for wireless communications in an OFDMA system that uses a rateless code and techniques are provided for dynamically adjusting the subcarrier resources allocated to an OFDMA relay node so that the relay is used at the right time according to the instantaneous channel state information (CSI). As a result, a higher throughput is achieved between source and destination nodes based on a low complexity algorithm for determining when relay assistance is helpful for completing a transmission between the source and destination nodes.

Abstract: An apparatus and a system for transmitting channel state information acquires channel state information of a channel between a mobile terminal and two or more cooperative base stations. The apparatus quantizes the channel state information separately by using a preset single-cell codebook used for quantizing the channel between the mobile terminal and each one of the two or more cooperative base stations. The apparatus acquires united codeword indexes of the quantized channel state information in the single-cell codebook; and transmits the united codeword indexes of the quantized channel state information in the single-cell codebook.

Abstract: Systems, methods, and apparatus are described that that increase throughput of a WiFi network. A first method is provided wherein access points monitor and keep track of their states on each resource block (frequency channel and antenna pattern) associated therewith and dynamically select the resource blocks that increase network throughput based on the instantaneous states of the access points. A second method is provided comprising employing Q-learning to determine one or more modifications of operating parameters of a network node based on observed throughput of the network and implementing the one or more modifications at the node. A third method is also provided which combines the first and second methods so as to increase network throughput at both the physical layer and the MAC layer.

Abstract: Mobile devices, mobile device systems and methods applying to mobile devices are provided that employ intelligent agents in combination with a wide array of remote utilities and information sources to facilitate improving a mobile device user's experience. By collecting contextual information from numerous information sources related to the mobile device user's context, more accurate and optimized determinations and/or inferences are formed relating to which remote utilities to make available to the mobile device user. This facilitates less confusion for the user in selecting desired mobile device content, services, and/or applications. The devices, systems, and methodologies also provide for an improved user experience in an open remote utility provider model.

Abstract: A method for sensing channel availability in a wireless network includes receiving a measurement request message which includes a channel interval list. A first channel interval in the list includes information associated with a first starting channel number, a first number of channels, and first linkage information of the channel interval list. The method includes processing information associated with the message, generating a first list of contiguous channels, and performing at least first channel measurement to determine a first channel availability for each of the first list of contiguous channels. The method also includes determining whether the channel interval list further includes a second channel interval that needs to be processed based on at least first linkage information, and if needed, generating a second list of contiguous channels and performing at least second channel measurement to determine a second channel availability for each of the second list of contiguous channels.

Abstract: Systems, methods, and computer-readable media for exploiting buffers in cognitive multi-relay systems for communicating delay sensitive application are presented herein. A secondary receiver device can select a first proximate relay station based on an assessment of communication links that extend from the first proximate relay station to the secondary receiver, and a secondary transmitter device that selects a second proximate relay station based on an evaluation of communication links that extend from the secondary transmitter and the second proximate relay station, wherein the first proximate relay station is employed by the secondary receiver device to communicate with the secondary transmitter device and the second proximate relay station is utilized by the secondary transmitter to communicate with the secondary receiver.

Abstract: Systems and methods which control communications in a carrier sense multiple access environment to provide a balance between communication sensitivity and transmission availability are shown. Adaptive interference control techniques of embodiments operate to determine a media error time metric representing the time associated with receiving interfering signals. The media error time metric of embodiments is used to adjust operation of various network systems in order to adjust communication sensitivity and/or transmission availability. Desensitizing thresholds and sensitizing thresholds may be used to define operating boundaries, such that desensitizing thresholds are used to control network desensitize actions which result in decreased error times and sensitizing thresholds are used to control network sensitizing actions which result in increased error times. Error time metrics and corresponding desensitizing and sensitizing thresholds may be utilized with respect to a plurality of radios.

Abstract: Mobile devices, mobile device systems and methods applying to mobile devices are provided that employ intelligent agents in combination with a wide array of remote utilities and information sources to facilitate improving a mobile device user's experience. By collecting contextual information from numerous information sources related to the mobile device user's context, more accurate and optimized determinations and/or inferences are formed relating to which remote utilities to make available to the mobile device user. This facilitates less confusion for the user in selecting desired mobile device content, services, and/or applications. The devices, systems, and methodologies also provide for an improved user experience in an open remote utility provider model.

Abstract: Method and apparatus for channel simulation is disclosed. The claimed invention provides method and apparatus 1200 to simulate a propagation channel, particularly a multiple-input-multiple-input (MIMO) channel. The claimed invention further provides a method and apparatus for efficient optimization of antenna by the enhanced channel simulation. The claimed invention takes both antenna characteristics and channel characteristics as inputs, and output time-varying channel realizations to generate the system metrics as the optimization target for antenna under optimization. The claimed invention advantageous provides enhanced channel simulation to meet the accuracy requirement of antenna evaluation.

Abstract: A method of transmitting or receiving with constrained feedback information. A transmitter transmits a plurality of transmit signals from at least one transmit antenna. The plurality of transmit signals are based on one or more input signals, one or more power gains, and one or more beamformer matrices. The plurality of transmit signals are received as at least one receive signal, at at least one receive antenna of a receiver. The receiver generates the constrained feedback information and transmits the constrained feedback information back to the at least one transmit antenna. The transmitter selects at least one of the power gains and at least one of the beamformer matrices for a subsequent transmission based on the constrained feedback information.

Abstract: Method and apparatus for channel simulation is disclosed. The claimed invention provides method and apparatus 1200 to simulate a propagation channel, particularly a multiple-input-multiple-input (MIMO) channel. The claimed invention further provides a method and apparatus for efficient optimization of antenna by the enhanced channel simulation. The claimed invention takes both antenna characteristics and channel characteristics as inputs, and output time-varying channel realizations to generate the system metrics as the optimization target for antenna under optimization. The claimed invention advantageous provides enhanced channel simulation to meet the accuracy requirement of antenna evaluation.

Abstract: System and methodologies for amplifier gain control in a communication system are provided herein. By leveraging similarities between the distribution of received signal samples in an MB-OFDM system and a Gaussian distribution, various algorithms described herein can be utilized to perform fast and low-complexity amplifier gain tuning. Received signal strength indication information corresponding to analog signal samples and/or digital signal samples obtained from an analog to digital converter are analyzed to obtain a signal energy distribution. The obtained signal energy distribution is then compared to a reference Gaussian distribution to adaptively tune an associated amplifier gain.

Abstract: In an aspect of the method, a received data packet is decoded in order to determine a packet error rate value, and an average package error value for N received data packets is updated based on the determined packet error rate value. The updated average packet error rate value is then compared against a threshold value and a data rate request is issued based on this comparison. In another aspect, a response to a transmitted data packet is received, the response being related to an average packet error rate value. The average packet error rate value is compared against a threshold and a data rate is modified based on the comparison. In each of the above aspects, a data rate control margin that is used to overcome channel estimate errors resulting from transmission delays may be dynamically adjusted, e.g., in real time, in order to optimize system resources.

Abstract: A robust closed-loop cross-layer design provides for the downlink multi-user multi-antenna systems with imperfect Channel State Information at the transmitter (CSIT) for slow fading channels. Using ACK/NAK feedbacks from mobiles, a closed-loop cross-layer scheduler does not require any knowledge of the CSIT error statistics. To take into account of the potential packet outage (due to imperfect CSIT), we define system goodput, which measures the average bits per second per Hertz (b/s/Hz) successfully delivered to the mobiles, as the optimization objectives. We formulate the cross-layer design as a mixed combinatorial search and Markov decision problem. Based on dynamic programming approach, the optimal power and rate allocation is determined using backward recursion and forward recursion algorithms. Simulations illustrate that the proposed closed-loop cross-layer scheduler has very robust goodput performance at moderate to high CSIT errors and pedestrian mobility.

Abstract: The disclosed subject matter provides scheduling algorithms, methods, and systems that facilitate cross layer scheduling for systems with imperfect channel state information and unknown interference. By exploiting ACK/NAK feedback from users of downlink traffic and recursively optimizing scheduling policy components over a state space, the disclosed subject matter provide robust and optimal cross layer scheduling in the presence of unknown interference and imperfect channel state information. The disclosed details enable various refinements and modifications according to cross layer schedule and system design considerations.

Abstract: A transmission protocol is provided for wireless communications in an OFDMA system that uses a rateless code and techniques are provided for dynamically adjusting the subcarrier resources allocated to an OFDMA relay node so that the relay is used at the right time according to the instantaneous channel state information (CSI). As a result, a higher throughput is achieved between source and destination nodes based on a low complexity algorithm for determining when relay assistance is helpful for completing a transmission between the source and destination nodes.

Abstract: A joint set of linear precoder designs is provided for single cell uplink multiuser space-time block coded multiple-input multiple-output (MIMO) systems with multi-packet reception by exploiting outdated channel state information. By deriving the pairwise error probability with respect to both minimum and average codeword distance design metrics, the technique solves an optimization problem subject to transmit power constraint for each user and dependent on the outdated channel state information. Due to the non-convex nature of the optimization problem, an iterative technique based on alternating minimization and projected gradient can be used to solve for a joint linear preceding structure for general space-time block coding. The linear precoding structure is then sent from the base station to various consumer premise equipment for use in later transmissions. For orthogonal space-time block code, a simplified distributed technique is provided to solve for a closed-form solution of the optimization problem.

Abstract: System and methodologies for timing synchronization in a wireless communication system are provided herein. The provided systems and methodologies can utilize various timing synchronization algorithms and an associated state machine to reduce the down time of a wireless communication system due to the presence of simultaneously operating piconets (SOP) and/or other factors. Frequency band finger pattern detection techniques are additionally described that can reduce boundary mismatch rates for wireless receivers. In one example, by making use of the fact that time frequency codes (TFCs) possess unique frequency hopping patterns, system down time can be reduced and OFDM boundary matching can be enhanced to allow a receiver to obtain correct timing information even for communication channels having a very low SINR.