Class / Patent application number | Description | Number of patent applications / Date published |
455266000 | Selectivity or bandwidth control | 15 |
20090054026 | SIGNAL FILTERING SYSTEM AND RELATED METHODS - A signal filtering system for a frequency reuse system. A first implementation may include a downlink baseband signal, coupled to a downlink bandwidth filter, including a composite received signal including at least an interfering signal and a signal of interest, each having a composite bandwidth, a first bandwidth, and a second bandwidth, respectively. An uplink baseband signal may be included, coupled to an uplink bandwidth filter, having a replica of the interfering signal corresponding with the interfering signal and having an interference bandwidth. A baseband processing module may be coupled with the downlink bandwidth filter and the uplink bandwidth filter and may be configured to cancel the interfering signal from the composite received signal using the replica of the interfering signal. The downlink bandwidth filter may be configured to reduce the composite bandwidth and the uplink bandwidth filter may be configured to reduce the interference bandwidth. | 02-26-2009 |
20090239493 | Filter Switching System and Method - A communication system with variable filter bandwidth includes a first mixer circuit configured to receive a communication signal and shift the frequency range of the communication signal to a first frequency range. A second mixer circuit is configured to receive the same communication signal and shift the frequency range of the communication signal to a second frequency range. An activation circuit is coupled to the first and second mixer circuit so as to provide an activation signal that activates at least one of the mixer circuits. A plurality of filter circuits are provided such that each filter circuit is configured to receive a signal from a corresponding mixer circuit, when said corresponding mixer circuit is activated. | 09-24-2009 |
20100330945 | RADIO RECEIVER - A radio receiver includes a down-converter | 12-30-2010 |
20110287730 | SIGNAL FILTERING SYSTEM AND RELATED METHODS - A signal filtering system for a frequency reuse system. A first implementation may include a downlink baseband signal, coupled to a downlink bandwidth filter, including a composite received signal including at least an interfering signal and a signal of interest, each having a composite bandwidth, a first bandwidth, and a second bandwidth, respectively. An uplink baseband signal may be included, coupled to an uplink bandwidth filter, having a replica of the interfering signal corresponding with the interfering signal and having an interference bandwidth. A baseband processing module may be coupled with the downlink bandwidth filter and the uplink bandwidth filter and may be configured to cancel the interfering signal from the composite received signal using the replica of the interfering signal. The downlink bandwidth filter may be configured to reduce the composite bandwidth and the uplink bandwidth filter may be configured to reduce the interference bandwidth. | 11-24-2011 |
20110294451 | RECEIVER - A receiver includes an input to receive data of a pilot channel having a carrier frequency associated therewith, and a first unit to obtain a quantity, wherein the quantity depends on a frequency broadening of the received data and a frequency shift of the received data with respect to the carrier frequency. The receiver also includes a second unit to adjust the bandwidth of a channel estimation unit, wherein the adjustment depends on the quantity. | 12-01-2011 |
20120202444 | ADJACENT CHANNEL OPTIMIZED RECEIVER - The present invention offers significant improvements in the performance of a radio receiver operating in an environment with high desired band interference. The present invention comprises a high selectivity RF circuit that is located between the antenna and the radio receiver, and utilizes superheterodyne technology to filter adjacent channel interference in the desired band frequency spectrum. This type of interference is problematic for IEEE 802.11 radio receivers that are implemented with the popular direct conversion radio receiver architectures. The present invention may be utilized in many types of radio receivers. | 08-09-2012 |
20130252567 | ADJACENT CHANNEL OPTIMIZED RECEIVER - The present invention offers significant improvements in the performance of a radio receiver operating in an environment with high desired band interference. The present invention comprises a high selectivity RF circuit that is located between the antenna and the radio receiver, and utilizes superheterodyne technology to filter adjacent channel interference in the desired band frequency spectrum. This type of interference is problematic for IEEE 802.11 radio receivers that are implemented with the popular direct conversion radio receiver architectures. The present invention may be utilized in many types of radio receivers. | 09-26-2013 |
20130260707 | Controlling Filter Bandwidth Based On Blocking Signals - In one embodiment, a method includes determining in a controller of a radio receiver whether at least one blocker signal is present in a blocking spectrum surrounding a desired radio channel. If no blocker signal is present, a channel filter of a signal processing path of the radio receiver may be controlled to operate at a first bandwidth. If a first blocker signal is present, the channel filter may be controlled to operate at a second bandwidth less than the first bandwidth. If the first blocker signal and a second blocker signal are present on opposing sides of the desired radio channel, the channel filter may be controlled to operate at a third bandwidth less than the second bandwidth, when a beating signal based on the first and second blocker signals is greater than a threshold level. | 10-03-2013 |
20140073279 | Minimizing Bandwidth in Down-Conversion of Multiple RF Channels - A method and system is disclosed for simultaneously down-converting multiple selected signals, such as RF signals, into adjacent ranges in an intermediate frequency band so that the total resulting bandwidth, and thus the sampling rate required to digitize the signal, is minimized. A first signal is down-converted into a range starting at a lowest selected frequency in the IF band. The next signal is down-converted, into a range higher than, but near or adjacent to, the down-converted range of the first signal, and so on. A guard band may be left between the signals if desired. In this way, the selected signals occupy the minimum bandwidth required. When the selection of signals to be down-converted is changed, the frequency ranges are dynamically adjusted so that the signals being down-converted always occupy the lowest ranges of the IF band. | 03-13-2014 |
20140106696 | DYNAMIC BANDWIDTH CONTROL SCHEME OF A FRAC-N PLL IN A RECEIVER - A receiver includes a mixer, a filter, a received signal strength indicator, and a control loop. The mixer is adapted to convert the frequency of a received signal. The filter is adapted to filter out undesired signals that may be present in the output signal of the mixer. The received signal strength indicator is adapted to detect blocker (also known as jammer) signals that may be present in the output signal of the low-pass filter and generate a feedback signal in response. The control loop is adapted to vary its bandwidth in response to the feedback signal of the received signal strength indicator. The control loop supplies an oscillating signal to the mixer. | 04-17-2014 |
20140220921 | RECONFIGURABLE WIDEBAND RECEIVER - One embodiment of the present invention provides a receiver for wireless communication. The receiver includes a demodulator and at least one filtering mechanism coupled to the demodulator, and an analog-to-digital converter (ADC) coupled to the filtering mechanism. The filtering mechanism can be configured to function as a low-pass filter (LPF) or a band-pass filter (BPF), thereby enabling the receiver to function as a direct-conversion receiver or a low-intermediate frequency (low-IF) receiver. | 08-07-2014 |
20140273905 | REDUCTION OF SECOND ORDER DISTORTION IN REAL TIME - In a radio receiver, a method of reducing second order distortion components, involves at a first mixer, mixing an input signal with an oscillator signal to generate an I component of a received radio signal; at a second mixer, mixing the input signal with a phase shifted oscillator signal to generate a Q component of the received radio signal; where the I and Q components of the received signal have a receive bandwidth; computing an estimate of second order distortion components as a power output of the I and Q components between approximately the receive bandwidth and twice the receive bandwidth of the received radio signals; and adjusting an operational parameter of the radio receiver to reduce the estimated value of second order distortion components. This abstract is not to be considered limiting. | 09-18-2014 |
20140378079 | DUAL MODE RADIO FREQUENCY RECEIVERS FOR WIDEBAND SIGNAL PROCESSING - Wireless communication is ubiquitous today with increasing deployments leading to increased interference, increasing conflicts, etc. Monitoring the wireless environment is therefore important for regulators, service providers, Government agencies, enterprises etc. Such monitoring should be flexible both in networks monitored within the wireless environment as well as detecting unauthorized transmitters, allowing dynamic network management, etc. However, such real time spectral/signal analysis in the prior art requires both a wideband direct conversion receiver (DCR), for high performance, wideband, fast, programmable spectral analysis, and a super heterodyne receiver for fast, narrowband, programmable demodulation for signal analysis. According to embodiments of the invention a single receiver design methodology exploiting a single RF circuit to provide superheterodyne and direct conversion receiver functionalities. | 12-25-2014 |
20160072534 | Signal Distribution System Cascadable AGC Device and Method - A cascadable AGC amplifier in a signal distribution system includes a low noise cascadable amplifier having a through path and a cascadable output. The cascadable amplifier is also configured to provide AGC over a predetermined input power range. The cascadable AGC amplifier can be configured to provide gain or attenuation. When the cascadable AGC amplifier is implemented in a signal distribution system, typically as part of a signal distribution device, an input signal can be gain controlled and supplied to multiple signal paths without distortion due to degradation of signal to noise ratio or distortion due to higher order amplifier products. The distributed signal is not significantly degraded by distortion regardless of the number of cascadable AGC amplifiers connected in series or the position of the cascadable AGC amplifier in the signal distribution system. | 03-10-2016 |
20160164547 | COMMUNICATION CIRCUIT FOR SUPPORTING COMMUNICATION FUNCTION AND ELECTRONIC DEVICE INCLUDING THE SAME - An electronic device includes a communication circuit. The communication circuit includes at least one receive amplifier configured to connect to an antenna and to low-noise amplify at least a part of a multi-band signal, and a transceiver including a mixer configured to mix the signal low-noise amplified by the at least one receive amplifier, wherein the transceiver is configured to process the multi-band signal. | 06-09-2016 |