Telefonaktiebolaget Lm Ericsson (publ)

Patrik Eriksson

Mats Erland Eriksson

Peter M Petersson

The present invention reduces automatic gain control (AGC) transients using first and second AGC processing branches to receive a signal. A gain is selectively adjusted (if desired) in the one of the AGC processing branches during a first time period. However, a gain is not adjusted in the other AGC processing branch during that first time period. The signals generated by the first and second AGC processing branches are then diversity processed to generate a received signal. The diversity processing effectively reduces the effect of any AGC transient.

Method and apparatus for reducing the effect of AGC switching transients

A method and apparatus for maximizing the signal-to-noise ratio of an output signal from a digital-to-analog converter. In a multicarrier transmitter the power of a plurality of modulated digital data streams are individually adjusted so that the peak power of the sum of the signals of the modulated data streams is equal to a full scale level of a digital-to-analog converter. The power adjusted signals are upconverted to their respective carrier frequencies and combined into a single digital data stream by an adder. The single digital data stream is converted into an analog data stream by the digital-to-analog converter. The power of the analog data stream is adjusted so that the power of each carrier frequency is at a level which provides a corresponding mobile station with a signal of acceptable quality.

Power control scheme for maximizing carrier signal-to-noise ratio in multicarrier transmitters

A digital-to-analog circuit arrangement that can be used, for example, in radio transmitters, includes a Digital-to-Analog Converter (DAC) whose output is connected directly to a mixer. A periodic signal is also provided to the mixer. The frequency of the periodic signal provided to the mixer, is an integer multiple of half the update rate frequency of the DAC. In an embodiment of the invention, the frequency of the periodic signal provided to the mixer, is half the update rate frequency of the DAC. An intermediate frequency (IF) filter can be provided. downstream of the mixer.

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Kolmården, Sweden

Patrik Eriksson