Lucent Technologies Inc.

Agere Systems Inc.

Helen Haeran Kim

Meng-Lin Yu

William J Garner

A receiver for a received signal having two or more different data levels comprises two or more channel estimators, (at least) one channel estimator for each different data level, where each channel estimator preferably implements an adaptive 2order or higher model of the transmission channel over which the received signals was transmitted to generate an estimated signal for one of the different data levels. The receiver also has a comparator that compares the current received signal to the estimated signals generated by the different channel estimators to select an output data value for the current received signal. The adaptive model of the transmission channel has coefficients that are dynamically controlled based on an error signal generated by the comparator. Each channel estimator relies on an output signal generated by an adaptive equalizer. In preferred shared-component implementations, each adaptive equalizer is shared by two or more different channel estimators, and, in one possible preferred shared-component implementation, all of the different channel estimators share a single adaptive equalizer.

Signal detection based on channel estimation

In a wireless transmitter, a class B or class C amplifier is used as a power amplifier for boosting the power level of a signal to be transmitted. To linearize the power amplifier, a feedback mechanism is included in the transmitter. The feedback mechanism provides for adjustment of a feedback gain which affects the overall gain of the signal, thereby effectively controlling the signal power level. In addition, a phase difference between components of the signal and the feedback versions thereof is corrected to increase the linearity of the power amplifier and stabilize the feedback mechanism.

Technique for effectively rendering power amplification and control in wireless communications

An amplifier with negative feedback, disposed in an integrated circuit arrangement, comprises an input amplification stage, configured to receive an input signal. A feedback stage configured to receive the output signal provided by the amplification stage, and provide a corresponding feedback signal to the amplification stage. A driver stage, coupled to the input stage, configured to receive the output signal provided by the amplification stage, and provide the output signal of the amplifier.

Low voltage variable gain amplifier with feedback

An integrated circuit device with a light-emitting diode thereon is disclosed. The device has discrete regions which function in concert to emit light when a suitable amount of voltage is provided. The device has four discrete regions: a first doped silicon region; a second silicon dioxide region; a third organic material region; and a fourth conducting material region. The first and fourth regions are electrodes which inject holes and electrons into the conducting organic material. The second region lowers the energy barrier between the first and third regions which improves the efficiency with which the polymer emits light. The diode of the present invention is fabricated on an integrated circuit using conventional integrated circuit fabrication techniques.

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Holmdel, NJ, United States of America

Helen Haeran Kim