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Class Information
Number: 455/296
Name: Telecommunications > Receiver or analog modulated signal frequency converter > Noise or interference elimination
Description: Subject matter having structure to (a) suppress the influence of extraneous electric or magnetic fields upon receiver circuitry, (b) prevent radiation of undesired electric or magnetic fields from the receiver circuitry, or (c) prevent translation through, or suppress at some point in, the receiver system any undesired modulation components accompanying a desired modulation carrier wave input signal which components are due to electrical disturbances within the useful frequency band or any undesired carrier wave, which may originate at a source external to the receiver wave input or collection means and arrive at the input or collector simultaneously with the desired modulated carrier wave.

Sub-classes under this class:

Class Number Class Name Patents
455/300 By shielding 139
455/302 Image frequency suppression 294
455/312 In demodulator or low frequency (e.g., audio frequency) 148
455/311 In radio frequency amplifier, intermediate frequency amplifier or converter circuit 226
455/297 In vehicle 103
455/310 Internally generated noise or oscillations 164
455/298 Originating in power supply 37
455/303 Using plural separate signal paths 374
455/308 With amplitude limiter 64
455/307 With specific filter structure 740

Patents under this class:

Patent Number Title Of Patent Date Issued
8712456 Method and system of channel detecting and reporting, terminal, and management center Apr. 29, 2014
8712361 Method and system for reciprocal mixing cancellation of wideband modulated blockers Apr. 29, 2014
8706070 RF system for reducing intermodulation (IM) products Apr. 22, 2014
8706061 Method for simultaneous transmitter operation Apr. 22, 2014
8693971 Receiver, receiver circuits, and methods for providing an interference-reduced signal Apr. 8, 2014
8693954 Interferer reduction Apr. 8, 2014
8693597 Sensor-based wireless communication systems using compressive sampling Apr. 8, 2014
8693566 Methods and systems for combined cyclic delay diversity and precoding of radio signals Apr. 8, 2014
8688065 Method to measure total noise temperature of a wireless receiver during operation Apr. 1, 2014
8687749 Mobile OFDM receiver Apr. 1, 2014
8687684 Apparatus and method for calibrating the I/Q mismatch in a quadrature bandpass sampling receiver Apr. 1, 2014
8682254 Wireless communication system modeling Mar. 25, 2014
8682246 Method and system for collaborative coexistence of bluetooth and WiMax Mar. 25, 2014
8681887 Turbo channel estimation for OFDM systems Mar. 25, 2014
8681850 Signal processing apparatus, signal processing method and program Mar. 25, 2014
8681842 Transforming I/Q impairments through a linear system Mar. 25, 2014
8676145 Mixer circuits for second order intercept point calibration Mar. 18, 2014
8676143 Multimode receiver with active blocker suppression Mar. 18, 2014
8670738 Imbalance compensator for correcting mismatch between in-phase branch and quadrature branch, and related imbalance compensation method and direct conversion receiving apparatus thereof Mar. 11, 2014
8670735 Receiver and method of estimating signal to noise power ratio Mar. 11, 2014
8670719 Multi-point opportunistic beamforming with selective beam attenuation Mar. 11, 2014
8670718 Method and system for antenna selection diversity with biasing Mar. 11, 2014
8670507 Concatentation-assisted symbol-level combining for MIMO systems with HARQ and/or repetition coding Mar. 11, 2014
8670478 Load estimation in frequency domain pre-equalization systems Mar. 11, 2014
8670355 System and method for network based hearing aid compatible mode selection Mar. 11, 2014
8666349 Radio frequency (RF) receiver with dynamic frequency planning and method therefor Mar. 4, 2014
8666348 Noise canceling control apparatus, recording medium, and noise canceling control method Mar. 4, 2014
8666347 Methods and devices for reducing radio frequency interference Mar. 4, 2014
8666343 DC-offset-correction system and method for communication receivers Mar. 4, 2014
8666323 RFID reader and method for suppressing transmission leakage signal thereof Mar. 4, 2014
8665128 Sigma-delta difference-of-squares log-RMS to DC converter with forward path multiplier and chopper stabilization Mar. 4, 2014
8665127 .SIGMA.-.DELTA. difference-of-squares RMS to DC converter with multiple feedback paths Mar. 4, 2014
8665126 .SIGMA..DELTA. difference-of-squares LOG-RMS to DC converter with forward and feedback paths signal squaring Mar. 4, 2014
8655298 Method and system for locating interferences by frequency sub-band Feb. 18, 2014
8654909 Semiconductor integrated circuit Feb. 18, 2014
8654831 Signal detection apparatus Feb. 18, 2014
8649729 System and method for providing broadband interference and allowing communication therethrough Feb. 11, 2014
8648738 Apparatus and methods of rate control for a sample rate converter Feb. 11, 2014
8644865 Method of measuring interference Feb. 4, 2014
8644787 Apparatus and method for forming multiple independent and dynamically adaptable intermediate frequency signals Feb. 4, 2014
8643446 Electro-magnetic interference reduction using opposing field transmitter Feb. 4, 2014
8639996 Systems and methods for uplink inter-cell interference cancellation using hybrid automatic repeat request (HARQ) retransmissions Jan. 28, 2014
8639294 System and method for performing automatic gain control in mobile phone environments Jan. 28, 2014
8639189 Mitigation of internetwork interference Jan. 28, 2014
8638895 Extension of Ethernet PHY to channels with bridged tap wires Jan. 28, 2014
8638883 DC offset cancellation in direct conversion receivers Jan. 28, 2014
8634794 Multi-user interference cancellation in a single-carrier radio receiver Jan. 21, 2014
8634792 Adjustable antenna assembly for receive blocking Jan. 21, 2014
8634790 Direct conversion receiver architecture with digital fine resolution variable gain amplification Jan. 21, 2014
8634490 Techniques for detection of signals in multiple-input multiple-output communication systems Jan. 21, 2014

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