Ericsson Gmbh

Cong Nguyen

Randy Bright

Phase modulation control techniques and supporting apparatus avoid phase discontinuity at the outset of RF signal generation. Such discontinuities might arise from phase control instabilities associated with transmit start up or from abrupt changes in phase at the beginning of transmit signal generation. A transmitter uses starting phase values in advance of transmit data phase values to initialize phase modulation control circuits or functions. Once phase control is stabilized, and possibly after other criteria are met, the transmitter transitions from using the starting phase values to using the transmit data phase values, so that a transmit signal begins carrying phase modulations associated with the desired transmit data. The phase modulation control techniques described herein apply where transmitters employ direct phase modulation in RF signal generation, and may have particular applicability to burst-type RF transmitters, such as a transmitter employing direct modulation of amplitude and phase in an EDGE communication system.

System and method of phase modulation control in RF signal generation

An improved base station is provided for use in a wireless communication system, the wireless communication system including a control center supplying operating power to a plurality of base stations located at spaced distances therefrom, with each base station capable of transmitting signals on a select number of carriers at a select transmit power per carrier. The improved base station includes a controller automatically controlling the number of carriers utilized by the improved base station during transmission. Operating information associated with the improved base station is downloaded by the controller from the control center. The operating information includes a desired number of carriers to be utilized by the improved base station for transmission, a desired transmit power per carrier, and an actual spaced distance of the improved base station from the control center. The controller calculates an allowed spaced distance of the improved base station from the control center from the downloaded operating information. The calculated allowed spaced distance is defined as the distance where sufficient operating power reaches the improved base station to permit the improved base station to transmit on the desired number of carriers at the desired transmit power per carrier. The controller compares the actual spaced distance with the calculated allowed spaced distance, and reduces the number of desired base station carriers utilized by the improved base station for transmission at the desired transmit power per carrier if the actual spaced distance is greater than the calculated allowed spaced distance.

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Durham, NC, United States of America

Cong Nguyen