Agency for Science, Technology and Research

Stmicroelectronics Asia Pacific Pte Limited

St-Ericsson Sa

Whizpace Pte Ltd

Power Automation Pte Ltd

Ser Wah Oh

Yugang Ma

Muralidhar Karthik

Pankaj Sharma

Karthik Muralidhar

Yonghong Zeng

Christopher Aldridge

Zhongding Lei

Haiguang Wang

Sumei Sun

Rongshan Yu

Shoukang Zheng

Anh Tuan Hoang

Wai Leong Yeow

Chee Ming Joseph Teo

Ronghong Mo

Yuan Zhou

Jaya Shankar Pathmasuntharam

Qingjun Zhang

Yuen Sam Kwok

Chong Yee Lee

Ming-Hung Tao

Chu Yeow Edward Peh

Yiyang Pei

Tran Phuoc Cuong Le

Weiqiang Zhang

Sen Gopa

Christopher Anthony Aldrige

Feng Hong

Gim Kerk See

Embodiments of the invention relate to low-cost and low-complexity mesh routing method to provide connectivity within a channel-diverse mesh network in which there is no common channel available for the whole network and in which a single transceiver is provided in each node. The mesh routing method includes a procedure for flooding radio resource maps (RRMs), a procedure for determining the operating channel for each mesh node device, a routing procedure for establishing a route for a pair of source device and destination device, and a maintenance procedure for repairing routes and optimize selection of operating channel.

Method and device for mesh routing in a channel-diverse mesh network

A spectrum information query system, a method of querying a database storing spectrum information and a secured query proxy device are provided, the spectrum information query system comprising a database storing spectrum information; one or more spectrum utilising devices forming a first communications network; and a secured query proxy device, the secured query proxy device configured to communicate at its front-end with the database storing spectrum information, wherein the secured query proxy device is configured at its back-end for a one-way downlink to the first communications network; a decoupled source that is decoupled from the first communications network, the source being coupled to the secured query proxy device, wherein the secured query proxy device is configured to obtain information associated with the first communications network via the decoupled source, the secured query proxy device being further configured to perform encryption of obtained information associated with the first communications network obtained from the decoupled source; and wherein the secured query proxy device is further configured to apply one or more security data preservation measures to the received spectrum information prior to transmission of the received spectrum information to the first communications network via the one-way downlink.

Spectrum information query system and a secured query proxy device

A low-profile wideband monopole antenna is provided. The antenna may include a radiating element configured in a bent monopole arrangement to provide a vertical polarization such that an omni-directional radiating characteristic is achieved. The radiating element may include a plurality of slots formed at or edged from each side of the radiating element to increase the effective current path length of the radiating element. The antenna may include a feed and a feeding structure extending from the radiating element to the feed. The antenna may further include a ground plane. The radiating element may be arranged substantially parallel to the ground plane. The surface area of the radiating element may be smaller than the ground plane.

Low profile wideband antenna

Embodiments of the invention relate to method of operating television white space (TVWS) geo-location database (GLDB). The method comprises: embedding a plurality of data signals in a plurality of radio frequency (RF) broadcast signals of at least one existing television or radio channel, wherein the data signals comprise at least one of TVWS GLDB data, time reference data and broadcast transmitter data which comprises at least one of transmitter location data and transmitter identification; and transmitting, over a RF network which is other than an internet protocol (IP) network, the RF broadcast signals together with the embedded data signals to a plurality of white space devices.

Method and apparatus for broadcast geo-location database (GLDB) for television white space (TVWS) spectrum access

There is provided an Advanced Metering Infrastructure (AMI) system including a plurality of gate-ways interconnected by a network comprising a plurality of subnets based on one or more types of networking protocols, each of the plurality of gateways communicatively coupled to or integrated in a metering device; and a concentrator connected to the network for receiving metering data from the metering devices. The concentrator and the plurality of gateways each defines a communication node in the network. In particular, each of the gateways is configured to store a route information comprising at least a primary route information and is operable to route uplink data received based on the route information, the primary route information indicating a predetermined one of the communication nodes for the gateway to route the uplink data to next as a first priority.

Routing protocol for advanced metering infrastructure system

The present invention is directed to a communication device of a wireless communication network, the communication device including a message generator configured to generate a beacon message having a traffic indication map (TIM) information element (IE), wherein the TIM IE includes a partial virtual bitmap field including at least one cluster; a determiner configured to determine for at least one cluster information indicating whether data is available in the communication device to be transmitted to a plurality of communication terminals of the wireless communication network; an encoder configured to determine an encoding mode for the information depending on the information and to encode the information based on the encoding mode; and a transmitter configured to broadcast the beacon message to the plurality of communication terminals corresponding to the at least one cluster. Methods of simultaneously addressing a plurality of communication terminals in the wireless communication network are also disclosed.

Addressing multiple communication terminals in a wireless communication network

A compression device which may include: a subset determination circuit configured to determine a subset of a traffic indication map, the traffic indication map including a plurality of bits, each bit indicating whether data to be transmitted to a respective pre-determined radio communication terminal is present in an access point; a pre-determined bit value determination circuit configured to determine whether the subset includes a bit of a pre-determined bit value; and a compressed string generation circuit configured to insert, if the subset includes a bit of the pre-determined bit value, into a compressed string the subset and an indicator indicating that the subset includes a bit of the pre-determined bit value, and further configured to include, if the subset does not includes a bit of the pre-determined bit value, into the compressed string an indicator indicating that the subset does not include a bit of the pre-determined bit value.

Signaling data compression/decompression devices and methods for wireless communication networks

In various embodiments, a method for determining whether a signal includes a wanted signal may be provided. The method may include determining a frequency at which the signal has a signal energy above a first pre-defined signal energy threshold and determining whether the signal includes a wanted signal, based on whether the signal has a signal energy above a second pre-defined signal energy threshold in a pre-defined frequency range in a frequency neighborhood of the determined frequency.

Methods for determining whether a signal includes a wanted signal and apparatuses configured to determine whether a signal includes a wanted signal

A method is provided for determining whether transmission signals are present in received signals, the method comprising: receiving a first signal via a first radio resource; receiving a second signal via a second radio resource; determining whether a first transmission signal is present in the received first signal based on the received second signal; and determining whether a second transmission signal is present in the received second signal based on the received first signal.

Method, device and computer readable medium for determining whether transmission signals are present in received signals

A method for estimating the speed of a mobile device in a network is provided that includes selecting a correlation length from a plurality of possible correlation lengths. A correlation result is generated based on the selected correlation length. A speed estimate is generated for the mobile device based on the correlation result.

Method and system for estimating the speed of a mobile device in a network

A method includes generating a plurality of noise-averaged channel estimates using noisy channel estimates. At least some of the noise-averaged channel estimates are generated using different averaging lengths. The method also includes selecting one of the averaging lengths based on the plurality of noise-averaged channel estimates. The step of selecting one of the averaging lengths may include subtracting the noise-averaged channel estimates from the noisy channel estimates to produce a plurality of noise-averaged differences and determining powers of the noise-averaged differences. The step of selecting one of the averaging lengths may also include determining total error powers associated with the different averaging lengths using the powers of the noise-averaged differences and selecting the averaging length corresponding to a lowest total error power.

Method and system for adaptive channel estimation in pilot symbol assisted modulation systems

An efficient architecture for a rake combiner is disclosed, for constructively combining the desired multi-path signals from a Code-Division Multiple-Access (CDMA) based system, such as a Third-Generation Partnership Project (3GPP) Frequency Division Duplex (FDD) mode Wideband CDMA (W-CDMA) system, or an IS-95 CDMA system. The described rake combiner employs a single M-stage tap-delay line, an N+1 input adder, an arrangement of index offsets, pass gates, comparators and an M-stage counter to perform the combination, where M represents the delay spread in terms of symbol duration and N represents the number of rake fingers to be combined. The rake combiner architecture facilitates lowered resource requirements through use of a single tap-delay line in contrast to a conventional rake combiner which uses a series of M-stage tap-delay lines and an N input adder to perform the combination.

Rake-finger combiner with reduced resource requirement

Two preferred embodiments provide slot synchronization of an initial cell search. Two Finite Impulse Response (FIR) filters are used to correlate the synchronization codes transmitted in the downlink (forward link). A sign bit is taken after the first FIR to significantly reduce the hardware requirements for the second FIR, and thus the whole system. The correlated results from the second FIR can be further processed using two different algorithms. The first adds a square operation to the correlated results whilst the second takes the magnitude before passing to the next stage. Regardless of which algorithm is adopted, the results are accumulated (I and Q), instead of averaged, and stored in a memory location for each successive correlation over the same location in different slots. The physical-layer processor (PLP) then reads the accumulated results from the memory location and searches for the peak position corresponding to the slot boundary.

High performance W-CDMA slot synchronisation for initial cell search with reduced hardware

The range R of effective bits (those containing information) within the N bit output(s) from an inner modem is determined and employed to select the M soft bits passed to a channel decoder, thereby avoiding underflow or overflow degrading the channel decoder performance. The average and standard deviation of 1P values for a base-two logarithm of the N bit output are used to determine the range R of effective bits, with the N bits shifted and clipped based on the computed value of R so that the M most significant bits from that range R are passed to the channel decoder.

Growing community of inventors

Singapore, Singapore

Ser Wah Oh