Abstract: One embodiment of the present invention provides a system for dynamic, on-demand, cross-channel bandwidth provisioning in a wireless communication system. During operation, the system determines, by a scheduler, bandwidth resources that are available in the wireless communication system. The available bandwidth resources comprise a plurality of scattered spectrum pieces. The system defines one or more logical channels that encompass the scattered spectrum pieces, aggregates multiple logical channels in response to determining that spectrum pieces encompassed by a single logical channel do not meet traffic need, and provisions a user or a service using spectrum pieces located within the aggregated multiple logical channels, thereby facilitating on-demand, cross-channel bandwidth provisioning.

Abstract: One embodiment of the present invention provides a wireless transceiver. The transceiver includes a plurality of receiving paths, a plurality of transmitting paths, a number of RF components, and a configurable multiplexer for coupling one or more RF components to the transmitting paths and the receiving paths. The multiplexer is configured in such a way as to allow a particular RF component to couple to a subset of the receiving paths and/or a subset of the transmitting paths, thereby enabling flexible provisioning of the RF components.

Abstract: One embodiment of the present invention provides an apparatus for allowing a Wi-Fi module to operate over TV white space (TVWS) bands. The apparatus includes a first receiver coupled to a Wi-Fi module and configured to receive a Wi-Fi signal from the Wi-Fi module, an analog-to-digital conversion (ADC) module coupled to the first receiver and configured to convert the received Wi-Fi signal to the digital domain, a spectral-shaping module configured to reshape a spectrum of the converted digital Wi-Fi signal, a digital-to-analog conversion (DAC) module coupled to the spectral-shaping module, and a first transmitter coupled to the DAC module and configured to transmit signals in TV white space (TVWS) bands.

Abstract: An object-tracking system can compute a distance to a target object. During operation, the system can use a radio antenna to receive a first radio signal pattern from a direction of a target object. The system determines a time interval from the received radio signal pattern, and determines a velocity of the local system. The system then computes a distance to the target object based on the time interval and the velocity of the object-tracking device.

Abstract: One embodiment of the present invention provides a system for controlling operations of an amplifier in a wireless transmitter. During operation, the system receives a baseband signal to be transmitted, and dynamically switches an operation mode of the amplifier between a high power back-off mode having a first power back-off factor and a normal mode having a second power back-off factor based on a level of the baseband signal.

Abstract: One embodiment of the present invention provides a signal-recording system. During operation, the system receives a wideband multi-channel radio frequency (RF) signal, which includes a plurality of single-channel RF signals modulated at different carrier frequencies. The system down-converts the received wideband multi-channel RF signal to baseband, and records the down-converted signal.

Abstract: One embodiment of the present invention provides a system for controlling operations of a power amplifier in a wireless transmitter. During operation, the system receives a baseband signal to be transmitted, and dynamically switches an operation mode of the power amplifier between a high power back-off mode having a first power back-off factor and a normal mode having a second power back-off factor based on a level of the baseband signal.

Abstract: One embodiment of the present invention provides an automatic gain control (AGC) module for a wireless communication system that includes a plurality of amplifiers. The AGC module includes a receiving mechanism configured to receive an input that indicates a total amount of gain adjustment; a collecting mechanism configured to collect a number of parameters associated with the amplifiers; a determining mechanism configured to determine a desired performance requirement; a gain-control engine configured to generate a gain profile for the amplifiers based on the collected parameters, the total amount of gain, and the desired performance requirement; and an output mechanism configured to output a plurality of control signals based on the generated gain profile, wherein a respective control signal independently controls gain of a corresponding amplifier, thereby enabling the wireless communication system to achieve the total amount of gain adjustment while meeting the desired performance requirement.

Abstract: One embodiment of the present invention provides an RF front-end system. The RF front-end system includes one or more RF front-end components and a programmable logic device, which has a baseband interface for coupling to a baseband digital signal processor (DSP), and a set of component interfaces for coupling to the one ore more RF front-end components. The programmable logic device is configured to: receive, from the baseband DSP via the baseband interface, a command which includes an address and a control signal; identify a component interface from the set of component interfaces based on the address; and send the control signal to the identified component interface, thereby enabling the baseband DSP to control a front-end component coupled to the programmable logic device via the identified component interface.

Abstract: One embodiment of the present invention provides a multi-band RF transmitter. The RF transmitter includes an RF integrated circuit (IC) chip that includes a plurality of identical wideband ports for outputting modulated RF signals, a plurality of narrowband power amplifiers (PAs), and a plurality of matching networks. A respective narrowband power amplifier (PA) is coupled to a wideband port of the RF IC chip via a respective matching network.

Abstract: One embodiment of the present invention provides a synthesizer. The synthesizer includes one or more tunable oscillators, a frequency-dividing circuit coupled to the tunable oscillators, and a multiplexer coupled to the frequency-dividing circuit. The frequency-dividing circuit includes a number of frequency dividers, and is configured to generate a number of frequency-dividing outputs. At least one frequency-dividing output has a different frequency division factor. The multiplexer is configured to select a frequency-dividing output.

Abstract: An ad-hoc network can create a private activity-based network for nodes associated with a common activity. A network node of the ad-hoc network can include a first radio for communicating with other network nodes of the ad-hoc network, a second radio for relaying data packets across the ad-hoc network, and a third radio for synchronizing network topology information with a respective network node of the one or more neighboring nodes. Specifically, the first, second, and third radios are different radios that operate concurrently. These three separate radios allow the network node to communicate with other network nodes using the second radio while using the third radio to discover changes to the ad-hoc network topology, and/or to synchronize an updated network topology with other neighboring nodes.

Abstract: One embodiment of the present invention provides a system for dynamic, on-demand, cross-channel bandwidth provisioning in a wireless communication system. During operation, the system determines, by a scheduler, bandwidth resources that are available in the wireless communication system. The available bandwidth resources comprise a plurality of scattered spectrum pieces. The system defines one or more logical channels that encompass the scattered spectrum pieces, aggregates multiple logical channels in response to determining that spectrum pieces encompassed by a single logical channel do not meet traffic need, and provisions a user or a service using spectrum pieces located within the aggregated multiple logical channels, thereby facilitating on-demand, cross-channel bandwidth provisioning.

Abstract: One embodiment of the present invention provides an RF front-end system. The RF front-end system includes one or more RF front-end components and a programmable logic device, which has a baseband interface for coupling to a baseband digital signal processor (DSP), and a set of component interfaces for coupling to the one ore more RF front-end components. The programmable logic device is configured to: receive, from the baseband DSP via the baseband interface, a command which includes an address and a control signal; identify a component interface from the set of component interfaces based on the address; and send the control signal to the identified component interface, thereby enabling the baseband DSP to control a front-end component coupled to the programmable logic device via the identified component interface.

Abstract: One embodiment of the present invention provides a system for implementing Long-Term Evolution (LTE) scheduling in a wireless communication system with scattered spectrum. During operation, the system determines bandwidth resources that are available in the wireless communication system. The available bandwidth resources comprise a plurality of scattered spectrum pieces. The system identifies a spectrum piece that has a bandwidth that is equal to or larger than a predetermined threshold, defines a logical channel that is centered at the identified spectrum piece, and performs LTE scheduling based on the defined logical channel, wherein the LTE scheduling involves provisioning a user or a service using spectrum pieces encompassed in the defined logical channel.

Abstract: One embodiment of the present invention provides an RF front-end module for machine-to-machine applications. The RF front-end module includes an integrated circuit (IC) chip that comprises multiple functional blocks. The multiple functional blocks include at least a transmission chain, a receiving chain, a synthesizer, and one or more interfaces for interfacing with other off-chip front-end components.

Abstract: One embodiment of the present invention provides a remote radio head (RRH) for a wireless communication system. The RRH includes a first integrated circuit (IC) chip that comprises multiple functional blocks and a second IC chip that comprises at least an up-converter and a down-converter. The multiple functional blocks include at least a processing unit, a digital-to-analog converter (DAC), and an analog-to-digital converter (ADC). The up-converter is configured to convert an intermediate frequency (IF) signal received from the first IC chip to the radio frequency (RF) domain, and the down-converter is configured to convert an RF signal received from an antenna to an IF signal to be sent to the first IC chip.

Abstract: One embodiment of the present invention provides a signal-recording system. During operation, the system receives a plurality of radio frequency (RF) signals, separates the RF signals to obtain a first group of RF signals in a first RF band and a second group of RF signals in a second RF band, and simultaneously down-converts the first group of RF signals to a first group of low intermediate-frequency (low-IF) signals in a first IF band and the second group of RF signals to a second group of low-IF signals in a second IF band. The system further converts the first group of low-IF signals and the second group of low-IF signals to the digital domain, and simultaneously processes all of the converted low-IF signals.

Abstract: One embodiment of the present invention provides a system for controlling operations of a power amplifier in a wireless transmitter. During operation, the system receives a baseband signal to be transmitted, and dynamically switches an operation mode of the power amplifier between a high power back-off mode having a first power back-off factor and a normal mode having a second power back-off factor based on a level of the baseband signal.

Abstract: One embodiment of the present invention provides a system for performing DC offset cancellation for a wireless receiver that includes one or more amplification stages between a demodulator and a baseband digital signal processor (DSP). During operation, the system calibrates values of static DC offset associated with a plurality of gain settings for at least one amplification stage, stores the calibrated DC offset values in a lookup table, receives a current gain setting for the amplification stage, maps a DC offset value from the lookup table based on the current gain setting, and cancels static DC offset for the amplification stage using the mapped DC offset value.