Motorola Corporation

Stephen W Henderson

Jeff L Pfeil

Javier J Tapia

Louay A Jalloul

Alan P Rottinghaus

Edward S Golovin

An apparatus (,) and method dynamically allocates radio frequency receive path resources as required by a programmable location engine (,). The programmable location engine (,) employs cascaded time of arrival and direction of arrival algorithms to determine per remote unit location data. The apparatus (,) employs a phased array antenna (,) and a programmable receiver switching apparatus (,). A plurality of radio frequency receivers (,) receive a plurality of different carriers, such as CDMA carriers, on each of a different phased array antenna element (,). An RF switching matrix (,) and mobile location shared resource controller (,) dynamically switch the plurality of radio frequency receivers (,) 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 element 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 by dynamically determining the delay offset, 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, (such as delay, phase, and the complex impulse response), and also expands the range of conditions under which they can be feasibly measured. A plurality of delay offsets, carrier frequency offsets, and coherent averaging lengths are considered for each measurement of channel parameters. An energy metric 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 method and apparatus for determining an angle-of-arrival (AOA) of the prompt ray at an adjacent sector of a base station is provided. High precision parameter estimates from a main sector location searcher (,) are provided to an adjacent sector location searcher (,) in order to enhance the accuracy of the parameter estimates generated by the adjacent sector location searcher (,). Main sector time-delay and phase estimates may be used as estimates for the adjacent sector time-delay, and phase estimates to increase the coherent averaging window within the adjacent sector location searcher, and hence to increase the accuracy of the amplitude estimation from the adjacent sector location searcher.

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Chicago, IL, United States of America

Stephen W Henderson