Interdigital Technology Corporation

Polytechnic University

Interdigital Patent Holdings, Inc.

Idac Holdings, Inc.

I-Tai Lu

Robert L Olesen

Chang-Soo Koo

Peter J Voltz

Yongwen E Yang

Qingyuan Dai

Eldad M Zeira

KunJu Tsai

Rui Yang

Jialing Li

Mario Joa-Ng

Erdem Bala

Leonid L Kazakevich

Juan Fang

Kenneth Kearney

Hui-Yuan Teng

Zihao You

Quingyuan Dai

Kun-Ju Tsai

Kunjun Tsai

A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.

Method and apparatus for implementing space time processing with unequal modulation and coding schemes

Method and apparatus for implementing space time processing

A resource block (RB)-based multicarrier modulation (MCM) transmitter and receiver structure for spectral agile systems are disclosed. The transmitter and the receiver are capable of sharing opportunistically available and non-contiguous channels with other users. The RB-MCM partitions the available spectrum, contiguous or non-contiguous, into multiple RBs (same or different sizes), applies a baseband MCM or single carrier modulation, or coded single carrier or multicarrier schemes in each RB with a type of spectral leakage reduction technique, and applies RB modulation for each RB to modulate the signal from baseband to the frequency band of that RB. At the receiver, the received signal may be filtered and RB demodulation may be applied to put each RB signal in baseband and a baseband multicarrier or single carrier or coded single carrier or coded multicarrier demodulation may be applied to each RB signal. Different RBs may use different modulation schemes.

Resource block based multicarrier modulations for agile spectrum

Systems and methods for providing orthogonal frequency division multiplexing-offset quadrature amplitude modulation (OFDM-OQAM) structure may be disclosed. For example, a synthesis filter bank (SFB) and/or an analysis filter bank (AFB) for a filter length may be derived. The filter length may be odd. Additionally, the AFB may be an inverse discrete Fourier transform (IDFT)-based AFB and/or a discrete Fourier transform (DFT)-based AFB.

Systems and methods for providing and/or using an OFDN-OQAM structure

In an orthogonal frequency division multiplexed (OFDM) multiple-in multiple-out (MIMO) wireless communication system, a method for correcting sampler clock frequency offset in a receiver comprises acquiring the frequency offset and symbol timing in a received signal by the receiver. The estimated value of a fractional offset is computed, and a correction in the frequency domain based upon the estimated value of the fractional offset is performed.

Method and apparatus for correcting sampler clock frequency offset in OFDM MIMO systems

In a wireless communication system, a method and apparatus for noise estimation of a received OFDM communication signal, wherein the signal comprises a data frame with a preamble having at least one long training field (LTF) containing two substantially similar OFDM symbols, comprise examining the LTF for substantially similar OFDM symbols. The noise power in the signal is estimated and the received signal power is measured. The signal to noise ratio is calculated and the signal power is determined by subtracting the noise power from the signal noise.

Method and apparatus for estimating signal-to-noise ratio, noise power, and signal power

Synchronizing the clocks of nodes or stations in a communications network in a way that is independent of computation and switching time. This may be done by synchronizing pseudo-random noise clocks (found in the nodes of a spread spectrum communication system) or by synchronizing chip sequence clocks (found in the nodes of a CDMA communication system). In this way, the accuracy of synchronization should only be affected by the resolution of a matched filter (i.e., a facility to match or correlate bit sequences) in the node. Once synchronized, these nodes may be used to locate another node or station based on transmission propagation delays determined by the synchronization method.

Methods and apparatus for synchronizing and/or determining the location of nodes

A 'peer-to-peer' hierarchical routing protocol&#x2014;also referred to as Zone-based Hierarchical Link State Routing protocol (or 'ZHLS')&#x2014;which incorporates location information into a novel &#x201c;peer-to-peer&#x201d; hierarchical routing approach. The network may be divided into non-overlapping zones. Aggregating nodes into zones conceals the detail of the network topology. Initially, each node knows its own position and therefore zone ID through a position determination unit, such as a Global Positioning System (GPS). After the network is established, each node knows the low level (node level) topology about node connectivity within its zone and the high level (zone level) topology about zone connectivity of the whole network. A packet may be forwarded by specifying the hierarchical address&#x2014;zone ID and node ID&#x2014;of a destination node in the packet header.

Methods and apparatus for routing in a mobile ad hoc network

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Dix Hills, NY, United States of America

I-Tai Lu