A method and apparatus for conducting a pilot signal search in a wireless communications network. The location of a mobile is determined within the network. This location is then used in determining search window sizes and other search parameter information that is used to search all pilot signals identified in a designated pilot signal set. Search window size is also determined based upon the location of the mobile and another component related to multipath effects for a transmitted pilot signal.

Method and apparatus for reducing pilot search times utilizing mobile station location information

The invention computes frequency-domain channel gains by compiling a set of estimated channel gains as a function of pilot sequences, a set of analytical channel gains variables, and a set of weighting coefficients variables. A plurality of weighting coefficients are computed as a function of time and frequency correlation functions, a noise correlation matrix, and pilot sequences. A weighting matrix is computed from the weighting coefficients. After receiving a training sequence from at least one transmitter, a received data matrix is computed from the training sequence. The weighting matrix and the received data matrix are used to compute the frequency-domain channel gains. The invention also provides a method for reducing the computational complexity of estimating the time and frequency response of at least one desired signal received by at least one antenna. Also, the time and frequency response of at least one desired signal received by at least one antenna can be both interpolated and predicted with the present invention.

Method and device for multi-user channel estimation

A system and method for determining the location of a mobile appliance where the tasking of the system to determine the location of the mobile appliance utilizes a first communications protocol standard and the reporting of the location of the mobile appliance utilizes a second communications protocol standard, where the first and second communication protocol standards are not the same and can include any of the commonly used communication protocol standards including TIA defined standards, ETSI standards, and SMR/ESMR defined standards.

Tasking and reporting method and implementation for wireless appliance location systems

In a data communication system capable of variable rate transmission, the data rate is determined by the largest C/I measurement of the forward link signals as measured at the Access Terminal. In one embodiment, the data transmission is scheduled based on an Access Terminal initiated forward power control, which reduces forward link rate quantization loss due to excess transmit power. The Access Terminal reports to the Access Point the excess C/I estimate for the selected rate. The Access Point then reduces its transmit power by an appropriate amount when serving that Access Terminal. In another embodiment, the data transmission is scheduled based on an Access Point initiated forward power control. The Access Point varies its transmit power over time either randomly or in synchronism with neighboring Access Points in the communication system, which enables an increase in the throughput achieved by users that receive a significant amount of interference.

Method and apparatus for forward power control in a communication system

A system, method and article of manufacture are provided for determining a location of a wireless device (402) in a wireless communication system (400). In general, an initial request is transmitted to wireless devices having known locations for position information so that a location can be determined for a first wireless device having an undetermined location (102). Those wireless devices with known locations that receive the initial request in turn transmit positioning information to the first wireless device (102). If position information from less than a sufficient number of wireless devices with known location is received by the first mobile wireless device, an additional request is then transmitted for response from these responding other wireless devices (104). After responses to the request from one or more of these responding other wireless devices are received (106), communication then occurs with at least a portion of the responding wireless devices to obtain information relating to the distance between the first wireless device and the responding wireless devices it is communicating with (108). Next, a location of the first wireless device is estimated using the information obtained from these responding wireless devices and the position information received from the wireless devices with known locations (110).

Use of third party ultra wideband devices to establish geo-positional data

Determining a timing offset for remote-unit ( 113 ) location is accomplished by comparing a known sequence ( 203 ) to the information ( 201 ) transmitted by the remote unit ( 113 ) and received by the remote site ( 101, 102 ). In the preferred embodiment of the present invention a correlation window length (or size of the known sequence ( 203 )) is allowed to vary based on a fundamental geometry of the serving and non-serving base stations, and a distance that the remote unit ( 113 ) is from the serving and non-serving base stations ( 101, 102 ).

Method and apparatus for locating a remote unit within a communication system

An apparatus (100) and method dynamically allocates radio frequency receive path resources as required by a programmable location engine (112). The programmable location engine (112) employs cascaded time of arrival and direction of arrival algorithms to determine per remote unit location data. The apparatus (100) employs a phased array antenna (104) and a programmable receiver switching apparatus (108). A plurality of radio frequency receivers (102a-102n) receive a plurality of different carriers, such as CDMA carriers, on each of a different phased array antenna element (106a-106d). An RF switching matrix (126) and mobile location shared resource controller (110) dynamically switch the plurality of radio frequency receivers (102a-102b) to not only receive the different carriers on each of the different phased antenna radio elements to determine time of arrival information, but alternately receive a same carrier signal over all or a portion of the phased array antenna elements to determine direction of arrival information.

Method and apparatus for determining remote unit location using phased array antenna elements

A method and apparatus for estimating mobile radio channel parameters (209) by dynamically determining the delay offset (435), carrier frequency offset, and coherent averaging length that yields the optimum despreading gain for current channel conditions. Obtaining the optimal despreading gain increases the fidelity of desired channel parameter estimates and also expands the range of conditions under which they can be feasibly measured. A plurality of delay offsets (407) carrier frequency offsets, and coherent averaging lengths are considered for each measurement of channel parameters. An energy metric (439) is assigned to each combination of delay offset and coherent averaging length, and this value measures the despreading gain for these conditions.

Method and apparatus for estimating a channel parameter

A multi-variate system having a microprocessor-based telecommunications interface which has a digital adaptive all-pass filter and automatically variable delay distortion equalization circuitry which in combination provide both pre and post delay distortion equalization on the transmit and receive sides of bidirectional data lines (or dedicated telephone lines), which interfaces a conventional 4-wire analog facility and a data station termination at the customer premises equipment. A method of practicing the preferred embodiment of the invention is also disclosed.

Multi-variate system having an intelligent telecommunications interface with automatic adaptive delay distortion equalization (and related method)

Audio and speech codecs such as MP3, AAC, and AMR are used extensively on mobile devices throughout the world. In the ideal case, such codecs rely on hardware acceleration. However, it is also very common to see software audio codecs running on the main application processor, which is often an ARM core processor. Such codecs must be memory efficient, processing cycle efficient, portable to multiple operating systems, robust to data loss, and must also have a modular interface. In this paper, we introduce the OpenCORE multimedia framework and associated optimized audio codecs which are a part of the Android platform. We show how these components meet the challenging requirements for use in mobile devices. The OpenCORE audio components are currently available from the Open Handset Alliance as part of the Android SDK, and the source code for these components is scheduled for release in late 2008. The components are thus freely available for use in mobile device projects, and for non-mobile projects as well.

Javier J. Tapia

Papers

Method and apparatus for locating a remote unit within a communication system

Method and apparatus for determining remote unit location using phased array antenna elements

Method and apparatus for estimating a channel parameter

Multi-variate system having an intelligent telecommunications interface with automatic adaptive delay distortion equalization (and related method)

Introduction to the OpenCORE Audio Components Used in the Android Platform