Qualcomm Incorporated

Steven M Mollenkopf

James H Thompson

William Robert Gardner

Brett Christopher Walker

Thomas Wilborn

James Ian Jaffee

Puay Hoe Andrew See

Puay-Hoe Andrew See

Sandor Szabo

A method, apparatus and computer program product for predicting received signal strength in a wireless mobile receiver. The invention bounds the range of allowed values for a next predicted signal. The bounded prediction compensates for erroneous values from multipath fading. The predicted signal strength is used to set the mobile receiver amplifier gain to the desired level.

Method and apparatus for predicting received signal strength in a communication system

A wireless transceiver includes a transmitter having a harmonic rejection mixer and an RF output phase-locked loop in a two step up-conversion architecture, and a direct conversion receiver. The transmitter includes a local oscillator for producing a signal at a multiple of an intermediate frequency, a quadrature modulator harmonic rejection mixer responsive to the signal at the multiple of the intermediate frequency for modulating in-phase and quadrature-phase base-band signals to produce an intermediate frequency signal, a filter responsive to the intermediate frequency signal for producing a filtered intermediate frequency signal, and an RF output offset phase-locked loop responsive to the filtered intermediate frequency signal and the signal at the multiple of the intermediate frequency for producing an RF transmission signal. The harmonic rejection mixer reduces filtering requirements to facilitate a high level of circuit integration. The local oscillator may use a integer or fractional-N phase-locked loop.

Wireless communications transceiver: transmitter using a harmonic rejection mixer and an RF output offset phase-locked loop in a two-step up-conversion architecture and receiver using direct conversion architecture

A transmitterconverts a complex baseband signalhaving I and Q quadrature signal componentsandfor transmission by an antennaAn intermediate frequency based complex-to-real up-converteruses subsampling to convert the complex baseband signalinto a real digital signalhaving digital signal representationsAn intermediate frequency based bandpass filtering digital-to-analog converteruses Delta-Sigma, bandpass techniques to convert the real digital signalinto a first analog signalhaving analog signal representationsA post-conversion bandpass filterisolates and boosts the signal-to-noise ratio of a selected analog signal representationto output a second analog signalhaving a post-filtered selected analog signal representationA tracking bandpass filterfurther bandpasses and up-converts the second analog signalto output a transmittable signalhaving a tracking-filtered selected analog signal representation

Transmitter system and method for a wireless communication system

A transmitterconverts a digital baseband signal inputfor transmission by an antennato support multiple communication standards. An over-deviation phase multiplierincreases signal phase deviation by a factor of M. A digital phase modulatorapplies trigonometric lookup tables. A digital intermediate frequency up-converterup-shifts frequencies of desired signal content. First and second digital-to-analog converters (DACs)anduse relatively low-bit operations, which add DAC noise. First and second low pass filtersandapply rejection above frequencies of desired signal content. An analog I/Q modulatorconverts from complex to real signals, adding an unwanted signal spaced from the desired signal content by an intermediate frequency multiple. A limiterreduces amplitude modulated noise. An over-deviation phase dividerdivides signal phase deviation by 1/M to reduce phase modulated noise.

Multi-standard transmitter system and method for a wireless communication system

A system and method for estimating the power of a signal. The signal is compared to and separated into a plurality of ranges. Each range is assigned a particular output value. The output values approximate the square of the input signal based on known characteristics of the input signal. A low pass filter is used to average a plurality of the output values.

System and method for estimating power

The present invention comprises a system and method for gain control of individual narrowband channels using a wideband power measurement. The present invention comprises a transmit power tracking loop which controls the power of the transmitted signal by controlling the gain applied to the signal. The function of the transmit power tracking loop is to measure power, accept commands for power adjustment, and adjust the power. Gain control is performed by producing an error signal using the comparison of measurements of a total of estimated powers of each narrowband signal and a measurement of the modulated wideband signal. In addition, open loop control is performed by accepting open loop commands generated by an algorithm.

System and method for gain control of individual narrowband channels using a wideband power measurement

The present invention comprises a system and method for gain control of individual narrowband channels using a wideband power measurement. The present invention comprises a transmit power tracking loop which controls the power of the transmitted signal by controlling the gain applied to the signal. The function of the transmit power tracking loop is to measure power, accept commands for power adjustment, and adjust the power. Gain control is performed by producing an error signal using the comparison of measurements of a total of estimated powers of each narrowband signal and a measurement of the modulated wideband signal In addition, open loop control is performed by accepting open loop commands generated by an algorithm.

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San Diego, CA, United States of America

Steven M Mollenkopf