Lucent Technologies Inc.

Stephen Douglas Kitko

Meng-Kun Ke

William A Nitz

Hans A Kvinlaug

Richard Joseph Lisco

Sheldon B Darack

L C Upadhyayula

The diagnostic test uses the effects of closed loop power control in order to measure the return loss of a receive antenna in a CDMA radio system. A standard CDMA call is established under closed loop power control by a mobile in a test unit. Using a switch matrix, the call is directed on the incident path of a receiving antenna. After a stabilization interval, the mobile phone in the test unit is queried for its transmit power level. The established call is then directed on the reflected path of the receiving antenna. After a stabilization interval, the mobile phone is again queried for its transmit power level. The difference between the previous incident transmit power level and the new increased transmit power level is the return loss of the antenna.

Method for measurement of receive antenna return loss in a CDMA radio system

A system and method effectively combines communications of the base stations of multiple wireless systems on the same antenna structure. In one implementation, a wireless system combiner serves as an interface between base stations of first and second wireless systems (&ldquo;first base station&rdquo; and &ldquo;second base station&rdquo;) and a shared antenna to substantially eliminate spurious noise from the first base station at frequencies allocated to the second base station and prevent transmit power from the first base station from feeding into the reception circuitry of the second base station in a shared antenna configuration. The combiner includes a first combiner filter between a duplexer of the first base station and a common connection point and a second combiner filter between a duplexer of the second base station and the common connection point. The first combiner filter filters out spurious noise generated by first base station transmitter at frequencies outside the frequency band allocated to the first base station, for example using a high Q value band-pass or band-reject filter. The second combiner filters out signal power at frequencies outside the second base station receive band to prevent transmit signal power of the first base station from feeding into the second base station's receiver circuitry, thereby preventing intermodulation.

Wireless system combining arrangement and method thereof

A methodology is provided for processing carriers in a wireless application whereby the outputs of a multiplicity of modulated RF signal sources are combined into a single RF signal stream, that single RF signal stream being thereafter divided among the inputs of another multiplicity of RF power amplifiers. The outputs of that multiplicity of RF power amplifiers are then recombined, filtered and provided as an input to a transmission antenna.

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Newton, NJ, United States of America

Stephen Douglas Kitko