Abstract: A high-speed switch that includes a switch fabric, and both high-speed serial ports and data converter physical ports. A first set of data converter physical ports may perform analog-to-digital conversions, such that an external analog signal may be converted to a digital input signal on the switch. The converted digital input signal may then be routed through the switch fabric in accordance with a serial data protocol. A second set of data converter physical ports may perform digital-to-analog conversions, such that an internal digital signal received from the switch fabric may be converted to an analog output signal on the switch. The converted analog output signal may then be transmitted to an external destination in accordance with a serial data protocol.

Abstract: An integrated circuit chip implements a high-speed switch that includes: a switch fabric; control logic that controls the transmission of digital signals through the switch fabric; a transceiver block comprising one or more transceivers, each transmitting digital signals between the control logic and a corresponding external device; a data converter physical interface comprising one or more data converters, each performing a conversion between analog and digital signals, wherein digital signals associated with the one or more data converters are routed through the switch fabric; and a signal processing engine coupled to the control logic, wherein the signal processing engine performs on-chip processing of digital signals received from the transceiver block and the data converter physical interface.

Abstract: A technique for enhanced reconditioning equalizer filter chain for multi-carrier signals is described. The input to a transmitter chain is modified by an enhanced reconditioning equalizer filter chain, prior to being applied to the transmitter. The enhanced reconditioning equalizer filter chain modifies and smoothen the amplitude of the signal. The modified and smoothen signal has its picks reduced which results to lower Crest Factor. The input to the enhanced reconditioning equalizer filter chain could be a baseband, an intermediate frequency (IF) or radio frequency (RF) signal. When the signal is an IF or RF signal it needs to be down converted to baseband before applied to enhanced reconditioning equalizer filter chain. The enhanced reconditioning equalizer filter chain could be implemented in digital or analog domain.

Abstract: A technique for enhanced reconditioning equalizer filter for non-constant envelope signals is described. The input to a transmitter chain is modified by an enhanced reconditioning equalizer filter, prior to being applied to the transmitter. The enhanced reconditioning equalizer filter modifies and smoothens the amplitude of the signal. The modified and smoothened signal has its peaks reduced which results in lower Crest Factor. The input to the enhanced reconditioning equalizer filter could be a baseband, an intermediate frequency (IF) or radio frequency (RF) signal. When the signal is an IF or RF signal it needs to be down converted to baseband before applied to enhanced reconditioning equalizer filter. The enhanced reconditioning equalizer filter could be implemented in digital or analog domain.

Abstract: A technique for enhanced reconditioning equalizer filter chain for multi-carrier signals with different technologies is described. The input to a transmitter chain is modified by an enhanced reconditioning equalizer filter chain for multi-carrier signals with different technologies, prior to being applied to the transmitter. The enhanced reconditioning equalizer filter chain modifies and smoothen the amplitude of the signal. The new signal is reconditioned and smoothened and has lower Crest Factor. The input to the enhanced reconditioning equalizer filter chain for multi-carrier signals with different technologies could be a baseband, an intermediate frequency (IF) or radio frequency (RF) signal. When the signal is an IF or RF signal it needs to be down converted to baseband before applied to enhanced reconditioning equalizer filter chain. The enhanced reconditioning equalizer filter chain for multi-carrier signals with different technologies could be implemented in digital or analog domain.

Abstract: A technique for a combined peak reduction equalizer filter and phase/amplitude pre-distortion is described. The input to a transmitter chain is modified by a combined equalizer filter and pre-distorter, prior to being applied to the transmitter chain. The equalizer filter modifies and smoothen the amplitude of the signal followed by pre-distorter to compensate for phase and amplitude distortion from transmitter chain or power amplifier. The modified and smoothen signal has its peaks reduced before being pre-distorted. The baseband signal pre-distortion results in cancellation of the distortion being introduced by the power amplifier or the transmitter chain.

Abstract: A technique for a reconditioning equalizer filter for OFDM and non-OFDM signals is described. The input to a transmitter chain is modified by a reconditioning equalizer filter, prior to being applied to the transmitter. The reconditioning equalizer filter modifies and smoothen the amplitude of the signal. The modified and smoothen signal has its peaks reduced which results to lower Crest Factor. The input to the reconditioning equalizer filter could be a baseband, an intermediate frequency (IF) or radio frequency (RF) signal. When the signal is an IF or RF signal it needs to be down converted to baseband before applied to reconditioning equalizer filter.

Abstract: A technique for a reconditioning equalizer filter using convolution is described. The input to a transmitter chain is modified by a reconditioning equalizer filter using convolution prior to being applied to the transmitter. The reconditioning equalizer filter modifies and smoothen the amplitude of the main baseband signal. The modified and smoothen main baseband signal has its peaks reduced which results to lower Crest Factor. The input to the reconditioning equalizer filter using convolution could be a baseband, an intermediate frequency (IF) or radio frequency (RF) signal. When the signal is an IF or RF signal it needs to be down converted to baseband before applied to reconditioning equalizer filter using convolution.

Abstract: A technique for an equalizer filter with dynamically configurable code domain filter is described. The input to a transmitter chain is modified by an equalizer filter with dynamically configurable code domain filter, prior to being applied to the transmitter. The equalizer filter with dynamically configurable code domain filter modifies and smoothen the amplitude of the signal. The modified and smoothen signal has its peaks reduced which results in lower Crest Factor with negligible degradation of Error Vector Magnitude of individual codes. The input to the equalizer filter with dynamically configurable code domain filter could be a baseband, an intermediate frequency (IF) or radio frequency (RF) signal. When the signal is an IF or RF signals it needs to be down converted to baseband before applied to the equalizer filter.

Abstract: A technique for an equalizer filter with dynamically configurable convolution filter is described. The input to a transmitter chain is modified by an equalizer filter, prior to being applied to the transmitter. The equalizer filter modifies and smoothen the amplitude of the signal. The modified and smoothen signal has its peaks reduced which results in lower Crest Factor. The input to the reconditioning equalizer filter could be a baseband, an intermediate frequency (IF) or radio frequency (RF) signal. In the case of an IF or RF signal, it needs to be down converted to baseband before applied to the equalizer filter.

Abstract: A technique for Crest Factor reduction of multi-carrier signals using phase rotation is described. The multi-carrier signal could be in digital baseband, analog baseband, or analog RF (radio frequency). The multi-carrier signal is converted to individual baseband representatives before each individual baseband signal being phase rotated according to an algorithm which maintains the crest factor to a pre-defined value. The algorithm uses a deterministic phase rotation technique and each phase rotated baseband signals will be individually filtered to remove the unwanted signals. The phase rotated and filtered baseband signals are then up converted and combined to reconstruct the multi-carrier signal. The crest factor reduction is limited by the in band distortion introduced to each individual signal.

Abstract: A technique to boost the output power of portable radio terminals without increasing the power dissipation is described. The input to the terminal transmit amplifier is modified by a peak-to-average reduction and an amplitude pre-distortion circuit, prior to being applied to the amplifier. The peak-to-average reduction and pre-distortion circuit modifies the baseband samples before applying any amplitude pre-distortion. The amplitude pre-distortion uses a lookup table updated at power up or power down of the terminal radio, during idle time, just before origination of a call, before termination of a call, or while the call is active. During the updating of the lookup table the radio could be in its normal transmit mode, or transmit into a dummy load.

Abstract: A technique for peak suppression, phase and amplitude equalizer of multi-carrier signals with different modulation is described. The input to the multi-carrier power amplifier is modified by a peak suppression, phase and amplitude equalizer circuit prior to being applied to the amplifier. The peak suppression is applied to a multi-carrier signal with different modulations and bandwidth. After peak suppression each individual carrier is phase and amplitude equalized to maintain the properties of the multi-carrier signal. The phase equalizer maintain the timing property of the carriers and the amplitude equalizer maintain the modulation accuracy of the individual carriers. The input to the peak-to-average reduction circuit could be a baseband, an intermediate frequency (IF) or radio frequency (RF) signal. The peak-to-average reduction is performed in digital domain.

Abstract: A technique for peak suppressing and pre-distorting the input signal to multi-carrier wireless radio frequency amplifiers to improve the power handling or boost the operating point of the amplifier and subsequently significantly improving the power efficiency of the amplifier is described. The input to the multi-carrier amplifier is modified by a peak suppression and pre-distortion circuit, prior to being applied to the amplifier. The peak suppression and pre-distortion circuit uses a phase generator to create appropriate phase for each carrier to suppress the peak of the multi-carrier signal. The peak suppression and pre-distortion circuit uses samples of the output of the amplifier to adaptively adjust a lookup table that is being used for pre-distortion. The input to the peak suppression and pre-distortion circuit could be a baseband, an intermediate frequency (IF) or radio frequency (RF) signal. The peak suppression and pre-distortion is performed in digital domain at baseband.

Abstract: A technique for Crest Factor reduction and amplitude pre-distortion of multi-carrier signals is described. The input to the multi-carrier amplifier is modified by a Crest Factor reduction and amplitude pre-distortion circuit, prior to being applied to the amplifier. The Crest Factor reduction and amplitude pre-distortion circuit first clips the amplitude of the signal, converts the clipped signal to baseband to produce the baseband representative of each carrier, filters each baseband representative to remove the unwanted signals, up converts each baseband representative to its multi-carrier baseband frequency and finally the up converted signals are combined to produce the multi-carrier baseband signal. The Crest Factor reduction and amplitude pre-distortion circuit next pre-distort the amplitude of the signal using a look up table before applying the signal to the amplifier.

Abstract: A filtering technique to remove imperfection from a signal that has been subject to channel imperfection is described. The output from any channel with imperfection is modified by a simple filter that minimizes any inter-symbol interference as well as removing un-wanted spectrum. The simple filtering can either be performed at baseband or RF/IF frequencies. To achieve its objectives the filter uses both real frequency and imaginary frequency zeros as well as poles in its transfer function. By adjusting location of these zeros the amplitude response of the filter alters without any change in its phase response. The filter could be realized in digital or analog domain.

Abstract: A technique for Crest Factor reduction of non-constant envelope signals is described. The input to any nonlinear circuit is modified by a Crest Factor reduction circuit, prior to being applied to the nonlinear circuit. The Crest Factor reduction circuit can either be performed at baseband or RF/IF frequencies. When performed at baseband the real and imaginary components of the baseband signal individually are applied to the Crest Factor reduction circuit. When performed at RF/IF the real signal is directly applied to the Crest Factor reduction circuit. The Crest Factor reduction divides the signal in two equal components one in-phase and one quadrature phase. Each component is then individually clipped based on magnitude of the real or complex signal and then filtered before being combined again by a combiner that 90 degree phase shifts the in-phase component before combining . In the case of RF/IF the clipped signal is bandpass filtered.

Abstract: A clipping technique for burst complex signal is described. The clipping is performed on the in phase “I” and quadrature phase “Q” of the complex signal. The technique uses the ratio of the rolling average as well as instantaneous value of the complex signal amplitude to calculate the amount of clipping. A third parameter in calculating the amount of the clipping is the absolute value of the rolling average of the complex signal amplitude. The rolling average is only calculated during the presence of the burst of the complex signal which is simply identified by the instantaneous value of the complex signal amplitude. The clipping value is stored in look up table which has two dimensions. One dimension is the ratio of the instantaneous and rolling average of the complex signal amplitude and the other dimension is absolute value of the rolling average of the complex signal amplitude.

Abstract: A technique for peak suppression, phase and amplitude equalizer of multi-carrier signals with different modulation is described. The input to the multi-carrier power amplifier is modified by a peak suppression, phase and amplitude equalizer circuit prior to being applied to the amplifier. The peak suppression is applied to a multi-carrier signal with different modulations and bandwidth. After peak suppression each individual carrier is phase and amplitude equalized to maintain the properties of the multi-carrier signal. The phase equalizer maintain the timing property of the carriers and the amplitude equalizer maintain the modulation accuracy of the individual carriers. The input to the peak-to-average reduction circuit could be a baseband, an intermediate frequency (IF) or radio frequency (RF) signal. The peak-to-average reduction is performed in digital domain.

Abstract: A hybrid technique for peak-to-average reduction of multi-carrier signals is described. The input to the multi-carrier power amplifier is modified by a hybrid peak-to-average reduction circuit prior to being applied to the amplifier. The hybrid peak-to-average reduction circuit uses two techniques simultaneously. The first technique is amplitude clipping to reduce the peak-to-average ratio. Following the clipping function, a phase generator that creates appropriate phase for each carrier is used to further suppress the peak of the multi-carrier signal. The input to the peak-to-average reduction circuit could be a baseband, an intermediate frequency (IF) or radio frequency (RF) signal. The peak-to-average reduction is performed in digital domain.