Motorola Corporation

Nicholas C Oros

Mark A Birchler

Steven C Jasper

Debra A Jones

James P Michels

A method for controlling an adaptive antenna array ( ) is provided and includes receiving a plurality of signals, each signal including a series of signal data symbols ( ) and signal non-data symbols ( ) divided into symbol transmission units with the signal non-data symbols ( ) disposed among the signal data symbols ( ) in each unit and each signal related to the other signals of the plurality of signals as reflections of an original signal. The method also includes separating the signal non-data symbols ( ) from the signal data symbols ( ), and comparing the signal non-data symbols ( ) to a set of known non-data symbols. The method further includes determining a set of weights according to the comparison of the signal non-data symbols ( ) to the set of known non-data symbols, the weights to be combined with the signal data values ( ) to limit the effect of interference on the signal data symbols ( ). An adaptive antenna array ( ) is also provided including a weight calculator ( ) including a program which controls the weight calculator ( ) to perform the comparing ( ) and determining steps ( ) of the method discussed above.

Adaptive antenna array and method for control thereof

A base site ( ) generates a pseudo-random signal based on at least one system parameter known to both the base site and a communication unit ( ). The base site ( ) then transmits the pseudo-random signal to the communication unit via an idle communication resource ( ). Upon receiving the pseudo-random signal, the communication unit ( ) determines at least one characteristic of the idle communication resource ( ) using the pseudo-random signal.

Method and apparatus for using a pseudo-random signal in a communication system

A wireless communication system (100) that includes a plurality of base sites (101-103) employs a method and apparatus for determining a location of a communication unit (107) in the system. Upon transmission of an information signal (109) by the communication unit, each of the base sites receives the transmitted information signal. A serving base site (e.g., 103) determines a stream of information symbols from the information signal, derives timing information based on the information signal and the stream of information symbols, and conveys the stream of information symbols preferably to at least two non-serving base sites (101-102). The non-serving base sites determine respective timing information based on the information signal received from the communication unit and the stream of information symbols received from the serving base site. The location of the communication unit is then determined by either a base site or a stand-alone processing device (105) based on the serving base site's and non-serving base site's timing information.

Method and apparatus for determining a location of a communication unit

Signals comprising time of transmission indications relative to a common time base (302) are transmitted by at least two fixed transceivers (110-116). When the signals are received by a mobile unit (160), a time of reception indication relative to the common time base is calculated for each signal. Pseudo-ranges are calculated based on the time of transmission and time of reception indications, and a WLS solution location estimate is calculated based on the pseudo-ranges. Essentially the same procedure may be performed on signals transmitted by the mobile unit. Given the common time base between the fixed transceivers and the mobile unit, only two or more signals are required to determine the location estimate. Where GPS receivers are used to supply the common time base, location determinations can still be made when a GPS solution is unavailable.

Method for estimating a location of a mobile unit based on at least two

Signals exchanged between a fixed infrastructure (110-116) and a mobile unit (160) give rise to M channel quality metrics. The channel quality metrics are mapped, via predetermined relationships (501-503), in to M corresponding time of arrival variances, which in turn are used to derive M-1 time of arrival differential variances. A time of arrival differential weighting matrix including, in part, the time of arrival differential variances, is used to calculate a WLS solution, which solution is an estimate of a location of the mobile unit. This procedure may be implemented using an infrastructure-based location processor (130) operating in conjunction with the mobile unit, or may be performed by either the location processor or mobile unit alone.

Method and apparatus for covariance matrix estimation in a weighted

In a diversity reception communication system (200), a method is provided for recovering data symbols (213) from a transmitted signal. Multiple signals representing the transmitted signal are received via corresponding multiple reception paths (201, 202). For each reception path, values are determined for noise (206), channel quality (207), and for a weighting factor (209) as a function of the channel quality. The signals are processed using diversity combining (212) which includes the weighting factor (209) for each reception path, to provide a resultant signal that more likely represents the transmitted signal than any of the received signals alone. The data symbols (213) are recovered from the resultant signal.

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Schaumburg, IL, United States of America

Nicholas C Oros