Abstract: A technique for PAR reduction involves producing an optimized clipping pulse. The optimized clipping pulse may be designed to meet certain requirements, such as a spectral mask target or an EVM target, when applied to a signal.

Abstract: This specification describes, in part, a technique for dynamic assignment of multiple antennas to different radio subsystems in a wireless device. The technique may include using an adaptive algorithm to allocate antennas to different radio subsystems as a function of, for example, application requirements, power requirements, and/or channel/network conditions. The specification also describes, in part, a technique for adaptively optimizing the use of the assigned antennas and other transmission parameters for each radio subsystem.

Abstract: In one aspect there is provided a method. The method may include receiving a signal transmitted through a channel; receiving an estimate of the channel; determining from the estimate of the channel at least one statistic representative of a variability of the estimate of the channel; decoding the received signal by at least searching for an output using a plurality of cost metrics determined based on at least the estimate of the channel and the at least one statistic; and providing, based on at least one of the plurality of cost metrics, the output. Related apparatus, systems, methods, and articles are also described.

Abstract: A technique to mitigate in-band spurs introduced into a signal due to various board/SiP layout issues at a receiver is disclosed. The spurs can be approximated as sinusoids at different known frequencies with unknown amplitudes and phases. The technique is applicable to both single and multiple spur cancellation.

Abstract: Disclosed are methods and apparatuses related to the routing of communications in a wireless mesh network so as to provide improved range, reliability and/or throughput. At least some aspects of the techniques and apparatuses can be implemented in an intermediary node (relay node) on a wireless mesh network. The relay node and other devices on the wireless network may implement a form of multiple-input multiple-output (MIMO) communication, such as multi-user MIMO (MU-MIMO). The devices on the network can communicate in accordance with IEEE standard 802.11.

Abstract: Interference cognitive devices are described. An interference cognitive device can be collocated with a transmitter of an interference cognitive transmitter (ICT), as receive chains or portions thereof at the ICT. An interference cognitive device can also be remote with respect to the transmitter, which operates in an interference cognitive network and receives data directly or indirectly from the interference cognitive device. The ICT uses the data to mitigate interference while continuing to operate in accordance with a performance metric.

Abstract: Several adaptive techniques are described to combat interference in multiple-input multiple-output (MIMO) systems. In addition to adaptive frequency selection, interference suppression techniques for a selected carrier frequency are presented. The interference suppression technique can be adaptively selected based on the availability and quality of channel state information (CSI) and interference statistics. Techniques to estimate interference statistics are also presented. Interference mitigation techniques are also presented for automatic gain control (AGC), intermittent interference, and interference caused to other networks.

Abstract: A technique to mitigate in-band spurs introduced into a signal due to various board/SiP layout issues at a receiver is disclosed. The spurs can be approximated as sinusoids at different known frequencies with unknown amplitudes and phases. The technique is applicable to both single and multiple spur cancellation.

Abstract: A technique for low-density parity-check (LDPC) coding involves utilizing a fixed point implementation in order to reduce or eliminate reliance on floating point operations. The fixed point implementation can be used to calculate check node extrinsic L-value as part of an LDPC decoder in an LDPC system. The technique can include one or more of linear approximations, offset approximations, and node-limiting approximation. A system constructed according to the technique implements one or more of linear approximations, offset approximations, and node-limiting approximation.

Abstract: Symbol mixing across multiple input multiple output (MIMO) parallel channels is disclosed. Each data symbol is transmitted over an effective channel with a weighted sum of the singular values associated with all spatial channels. By averaging the singular values, there is less of a penalty associated with the choice of modulation and coding on the data symbols, since all transmitted symbols experience roughly the same signal to noise ratio (SNR) in transmission.

Abstract: A technique for processing received signals in multiple-antenna systems. Received signals from the different antennas may be amplified by a Low Noise Amplifier (LNA) and time-multiplexed by a switch to form a single analog signal. The time-multiplexed analog signal is down-converted and processed using a single RF chain for each signal component. This may result in an N-fold decrease in hardware in multiple antenna receiver systems.

Abstract: An architecture and protocol stack for matrix mesh wireless networks, where one or more nodes (102) and/or clients in the network have more than one antenna (208). One or more frequency bands and support devices with different communication protocols can be utilized. Matrix channel characteristics are used to establish parameters for each matrix channel in the matrix mesh network.

Abstract: A technique weights noise power used in a demodulation/demapping process using on an estimate of interference and its associated power. Using this technique the effect of partial interference can be ameliorated. For example, a value, ?2, can be used to represent the estimated noise and interference power, and ?2 can be used to modify a received signal to ameliorate the effects of noise and interference. ?2 can be adjusted in response to partial interference, and can be represented by the formula: ?2=?N2+q ?I2, where ?N2 is “noise power,” ?I2 is “interference power,” and q is an interference correction factor.

Abstract: A technique for PAR reduction involves producing an optimized clipping pulse. The optimized clipping pulse may be designed to meet certain requirements, such as a spectral mask target or an EVM target, when applied to a signal.

Abstract: A technique for implementing a radio receiver to reduce complexity involves utilizing a reduced-complexity decoding technique for a shortened Hamming (15, 10) block code.

Abstract: A technique for low-complexity high-performance coherent demodulation of GFSK signals involves utilizing a novel phase and frequency tracking mechanism coupled with a trellis search technique to track signal memory in the demodulation process. A method according to the technique may include modeling modulation based upon a trellis. The method may further include estimating unknown parameters, selecting a maximum likelihood path through the trellis, and mapping the maximum likelihood path to an output bit sequence. The technique is also applicable to DSPK and other applicable known or convenient protocols.

Abstract: This specification describes, in part, a technique for dynamic assignment of multiple antennas to different radio subsystems in a wireless device. The technique may include using an adaptive algorithm to allocate antennas to different radio subsystems as a function of, for example, application requirements, power requirements, and/or channel/network conditions. The specification also describes, in part, a technique for adaptively optimizing the use of the assigned antennas and other transmission parameters for each radio subsystem.

Abstract: A wireless multimedia handset can include one or more of wireless system support, a platform to handset features, and multiple features. The multiple features may include, by way of example but not limitation, multiple-antennae, multimedia storage with advanced search capability, a high fidelity sound system, peer-to-peer networking capability, seamless handoff capability, instant hotspot capability, and ultra low power operation such that the handset is capable of operation without recharging by operating solely on solar cells.

Abstract: The invention provides a multiple-antenna wireless multimedia headset with high fidelity sound, peer-to-peer networking capability, seamless handoff between multiple wireless interfaces, multimedia storage with advanced search capability, and ultra low power such that the device is capable of operation without recharging. The headset supports multiple wireless systems such as Wifi (802.11a/b/g/n), Wimax, 3G cellular, 2G cellular, GSM-EDGE, radio (e.g. AM/FM/XM), 802.15 (Bluetooth, UWB, and Zigbee) and GPS. The headset also provides a platform such that applications can access the high fidelity sound system, the speech recognition engine, the microprocessor, and the wireless systems on the device.

Abstract: Portable media devices allow a user to access music or other media stored on the device, and two portable media devices equipped with wireless technology can exchange stored files over the air.