Qualcomm Incorporated

Symmetricom, Inc.

Pico Mobile Networks, Inc.

Madihally J Narasimha

Je Woo Kim

Kishan Shenoi

Jong Hyeon Park

Lu Chang

Junqiang Li

Parvathanathan Subrahmanya

Nitin Kasturi

Youngjae Kim

Yuanning Yu

Dineshkumar Karuppanna Gounder Ramasamy

Sungjun Hwang

A system is provided and includes a buffer, an interface, a processor, and an output device. The interface is configured to receive a packet from a network. The processor is configured to: determine a delay of the network in transmitting the packet; prior to storing the packet in the buffer, determine statistics of the buffer, and an amount the buffer is filled; determine a predetermined delay of the buffer based on the delay of the network, and the statistics; estimate an actual delay of the buffer for the packet based on the amount the buffer is filled; generate an error signal based on the predetermined delay and the actual delay; and based on the error signal, one of compress and expand the packet to change a first length of the packet to a second length. The output device is configured to output the packet based on the second length.

Integrated adaptive jitter buffer

The described aspects include a user equipment (UE) apparatus and corresponding method of equalizing samples of received signals in wireless communication. A plurality of samples of a signal received in wireless communication can be obtained, and on-time samples and late samples of the plurality of samples are independently equalized to respectively generate equalized on-time samples and equalized late samples. In addition, a preference factor can be applied to at least the equalized on-time samples to generate preferred equalized on-time samples, which are combined with the equalized late samples to generate a set of equalized samples for decoding.

Method and apparatus for a robust fractionally spaced equalizer

Certain embodiments of the present disclosure support techniques for interference cancellation in a multi-mode wireless modem that supports coexistence of different radio technologies.

Methods and systems for interference cancellation in multi-mode coexistence modems

Certain embodiments of the present disclosure propose methods and systems for classifying the Doppler spread based on the output of the frequency-tracking loop (FTL) discriminator in WiMAX systems to improve the performance of the channel estimation. The Doppler spread may be classified as low, medium or high based on the statistics of the output of the discriminator in the fine-tracking mode.

Methods and systems with simplified doppler spread classification

The present invention is a method of correcting packet discontinuities using the steps of:

Certain embodiments of the present disclosure relate to a method for tracking of a carrier frequency offset. A soft combined frequency tracking discriminator is proposed as a part of the closed loop structure that can provide fast tracking of the frequency offset in an initial pull-in mode, and can also track small residual frequency variance in a fine-tracking mode.

Methods and systems using fine frequency tracking loop design for WiMAX

Certain embodiments of the present disclosure relate to methods for peak-to-average power ratio (PAPR) reduction of a transmission signal in a single carrier frequency division multiple access (SC-FDMA) system. The proposed methods and systems are based on manipulations of an SC-FDMA transmission signal in a time- and/or a frequency-domain.

Methods and systems for PAPR reduction in SC-FDMA systems

Certain embodiments of the present disclosure relate to a Fourier-Quadratic (FQ) method for channel estimation that may help improve error rate performance of existing techniques, with only moderate increase in computational complexity. The proposed FQ scheme according to certain embodiments may provide a viable solution to the difficult channel estimation problem encountered in the Vehicular B channel with a long delay spread. Furthermore, a robustness of the proposed FQ channel estimation scheme to accommodate errors in a channel delay profile and to errors in a channel power profile is demonstrated through simulations.

Methods and systems for fourier-quadratic basis channel estimation in OFDMA systems

Certain embodiments of the present disclosure relate to methods for mitigating interference of signals transmitted to a mobile station (MS) from a plurality of neighboring base stations. By applying a proposed spatio-frequency modulation (SFM) technique at a serving base station (BS) and at each interfering BS, a co-channel interference (CCI) from interfering base stations can be efficiently mitigated at the MS and signal transmitted from the serving BS can be more accurately decoded.

Methods and systems for co-channel interference cancellation in wireless networks

New methods for synchronizing previously unsynchronized BTS's of time division multiple access cellular networks are disclosed. Timing information that is readily available throughout the network is used to determine for each BTS when information representing a particular event is transmitted relative to the timing information. The time differences that are detected are used for steering the clock of each BTS to have the next or some other subsequent event transmitted at the same time.

Synchronization of TDMA cell sites

Apparatus and methods for distributing synchronization throughout a network is disclosed. The distribution of the synchronization is through the use of generating a reference timing signal, and by counting the line clock pulses between the start of a frame and the timing reference signal pulse at a first office and that count is then encoded and transmitted to the next office. At the next office, the transmitted count is decoded and used for regenerating synchronization by counting a number of received line clock pulses from the start of the frame to regenerate the reference timing signal. Particular criteria for selecting the frequencies for the timing reference signal are disclosed.

Growing community of inventors

Saratoga, CA, United States of America

Madihally J Narasimha