Matches 51 - 100 out of 121 < 1 2 3 >
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5748683 Multi-channel transceiver having an adaptive antenna array and method  
A receiver (100), transmitter (200) and transceiver (400) in accordance with the present invention overcome the disadvantages of applying adaptive antenna array technology to multi-channel...
5680102 RF data communication link for wireless audible indication system  
A wireless audible indication system comprising a transmitter and a receiver. An embodiment of the transmitter includes a modulator formed by a microprocessor and a radio frequency oscillator. The...
5581583 Optimizing the analog BER function in a spatial angular diversity digital radio receiver  
A radio link for a digital radio transmission system having spatial and/or angular diversity is optimized in real time by searching for a minimum of the analog BER function BERn(φ), by analyzing...
5554892 Signal processing circuit for switch capable of reducing insertion loss  
A high frequency power amplifier is implemented by a GaAs FET and is supplied with a positive and a negative power supply. The amplifier amplifies the power of an input signal and delivers the...
5481569 Optimizing the analog bit function in a diversity radio receiver by varying the relative attenuation level between two channels after optimizing the relative phase between the two channels  
A radio link for a digital radio transmission system having spatial and/or angular diversity is optimized in real time by first varying the relative phase φ between the two channels to locate an...
5345603 Receiver arrangement formed by a plurality of receive branches  
This arrangement is formed by two receive branches (1) and (4) for receiving a wave whose frequency spectrum is practically constant in a predetermined frequency band, a combining circuit (15) for...
5345604 FM vehicle radio with modular phase shifters  
A modularly-designed FM vehicle radio for operation in connection with a plurality of antennas is disclosed, where the summing circuit consists of a series connection of the secondary coils of the...
5339334 Method and apparatus for diversity reception  
The disclosure relates to methods and apparatus for combining a multiplicity of diversely received replicas of a signal originating in the same remote transmitter. The disclosed methods and...
5321850 Diversity radio receiver automatic frequency control  
A radio-frequency receiver employing antenna diversity is provided with a plurality of antennas and a local oscillator. Individual error signals are derived from each of respective ones of signals...
5263189 Apparatus and method for correcting electrical path length phase errors  
Compensation is provided for phase errors resulting from differing path lengths in a receiver system having a multi-element antenna. Variable phase shifters are adjusted to provide phase shifts to...
5263180 Space diversity reception system  
In a space diversity reception system, a plurality of receiving circuits, each of which is connected to respective antenna, outputs a first type signal having a level which varies in accordance...
5204979 Diversity receiving method and apparatus for combining a plurality of rapidly changing signals  
According to the receiving method for mobile reception has a plurality of individual receiving antennas, also known as diversity receiving method, on the individual antenna output signals an...
5203029 Combiner circuit in space-diversity reception  
A combiner circuit employs the maximum power method, in which the phase of one of the signals is varied such that the power of the aggregate signal (main and diversity) is varied such that the...
5203025 Selection circuit in a space diversity reception system for a mobile receiver  
A selection system in a space diversity system of a mobile receiver combines the ultra high frequency signals after they have been frequency shifted to an intermediate frequency. The system...
5067173 Microcellular communications system using space diversity reception  
Microcellular stations are transceiving units covering a relatively small geographic area and adapted to establish bidirectional links between mobile telephone subscriber stations and a main base...
5046133 Interference cancellation circuit  
An interference cancellation circuit which can remove the interference signal caused by other systems and contained in received signals. The interference signal can be cancelled even if the...
4989262 Demodulator with multiple interference cancellers responsive to correlations between undesired signals and error signals  
Undesired signals detected by a main antenna are cancelled by corresponding interference cancelling signals. The output of the main antenna is frequency converted to IF region and decomposed into...
4972434 Receiver for a space diversity radio transmission system, the receiver including a diversity combiner  
A receiver for a space diversity radio transmission system, the receiver including a diversity combiner (CD) and a diversity control circuit (7) which is responsive, inter alia, to a distortion...
4956853 Method of servo-controlling the instant of regeneration in a digital transmission in which a carrier is modulated along two axes in quadrature, and apparatus for implementing the method  
A method of servo-controlling the instant of regeneration in a digital transmission in which a carrier is modulated along two axes in quadrature, in which the optimum instant of regeneration is...
4939791 Diversity radio receiver for use with multiple antenna, particularly car radio  
To increase the fidelity of radio reception in a moving receiver, for example a car radio, the signals received from various antennas on the radio are mixed with a carrier in the receiver, and the...
4868890 Diversity combiner  
A diversity combiner is provided for combining two received radio signals having the same frequency and modulation. For each of the radio signals (s, s') there is included a mixer (1, 1') with an...
4856080 Circuitry for the diversity unit in an FM receiver for a telephone system  
A circuitry in a diversity unit of an FM receiver for a telephone system having at least two channels for receiving signals, and at least one phase-lock loop. The signals received by the channels...
4797950 Multipath reduction system  
The effects of multipath and other interference signals in communication receivers are reduced by implementing an adaptive array. The invention addresses a signal environment in which the...
4752941 Diversity receiving system of in-phase combination type  
A receiver adapted for in-phase combining of plural received signals includes a phase shift circuit for adjusting the phase of at least one of the received signals. The phase shift circuit is...
4736455 Interference cancellation system  
An interference cancellation system at a receiver side for digital radio system has a first quadrature phase detector for demodulating the main signal. A second quadrature phase detector (or a...
4733402 Adaptive filter equalizer systems  
An adaptive filter (11) for use in a diversity receiver system (10) which includes circuitry (23, 24, 25, 26, 34) for determining the strongest received diversity signal or group of signals at each...
4710975 Space diversity reception system having compensation means of multipath effect  
A space diversity reception system which minimizes the inband amplitude and/or phase dispersion by controlling the phase shifter is described. According to the present invention, the interference...
4593413 Space-diversity receiving system  
A space-diversity receiving system for microwave band radio communication including two antennas and receivers, an endless phase shifter, a hybrid combiner, a hybrid distributor, a voltage...
4555807 Apparatus and method for channel identification  
An improvement to a baseband system having a plurality of down converters feeding a single baseband receiver for assuring the same mean time to intercept while maximizing the probability of...
4528697 Broadband quadrature phase modulator for control loop error generation in an IF combiner  
Circuitry for use in an IF combiner, where main and diversity receiver path signals are combined. The circuitry generates an error signal for the purpose of controlling the phase of one of these...
4512034 Technique for digital radio space diversity combining  
The present invention relates to a space diversity combiner which includes two branches wherein separate multipath signals received from a remote source are propagated. The branch signals are...
4498885 Space diversity system  
A space diversity system for transmitting digital microwaves is disclosed. Each of two antennas receives a direct wave and an interference wave. The output phase of one of the two antennas is...
4497067 Interference cancellation type space diversity system  
An interference cancellation type space diversity system transmits digital microwaves in a sure and stable manner. Signals coming in through two spaced antennas are combined together into a single...
4484218 Video distribution control system  
A subscriber distribution terminal is connected to the transmission medium for serving a group of subscribers. Within the distribution control terminal is located a plurality of television...
4406017 Method for diversity reception and apparatus therefor  
The stability of reception of information signals in a low-quality radio communication circuit is notably improved by a method and apparatus of diversity reception which, by means of the local...
4386435 Space diversity receiver with means for combining signals from the two channels  
A space diversity receiver with a combiner in which the useful signals of two space diversity receiver branches are connected together with a summing amplifier in the IF frequency band, and wherein...
4384366 Interference compensation system  
An interference compensation system having a main antenna (1) which receives both the desired signal and the undesired interference signal I M , an auxiliary antenna (2) which receives only the...
4373210 Space diversity combiner  
The benefits of space diversity combining in the presence of interference has been found to depend upon the signal-to-interference ratios at the two antennas. For optimum results, the...
4373207 Space diversity signal combiner  
In a diversity signal combiner, the weaker of the two signals is attenuated an amount that varies as a function of the phase angle between the two signals. When the phase angle is small, the...
4367542 Phase shifting of waveforms  
A signal having the form cos (Ωt+φ) where Ω is the frequency of the signal and φ is a phase angle which may be zero is phase shifted to improve the results of the summation of such a signal...
4354276 Equalizing signal combiner  
In a space diversity receiver, the relative phase of the two received signals is varied in manner to minimize amplitude dispersion in the combined signal. A phase control signal is derived from the...
4347627 Adaptive array processor and processing method for communication system  
A processing circuit (50) in a communication system performs multi-channel adaptive array processing using a summed reference technique. A plurality of adaptive modules (56 and 58) modify the...
4334316 Pre-detection maximal ratio combining system for diversity reception of radio frequency signals  
A pre-detection maximal ratio combining system for a plurality of received signals is provided in which a plurality of control devices are arranged for controlling the phase and amplitude of each...
4328585 Fast adapting fading channel equalizer  
A receiver system for processing diversity channel signals to substantially eliminate future and past intersymbol interference (ISI) in received signals which have been transmitted through a...
4313211 Single sideband receiver with pilot-based feed forward correction for motion-induced distortion  
Effects of multipath fading and Doppler frequency spread in a single sideband radio communication system are largely overcome by separating (17) from a received signal spectrum, a pilot frequency...
4295140 Faraday rotation measurement method and apparatus  
A method and apparatus for measuring Faraday rotation of a received rf signal. The disclosure describes a specific implementation of a simultaneous orthogonal polarization receiver which...
4261056 Equalizing signal combiner  
A signal combiner in a digital radio system space diversity receiver measures (19) the power in selected portions of the spectrum of the output signal (18) and varies the circuit parameters (17) in...
4079318 Space diversity receiving system with phase-controlled signal combining at intermediate frequency stage  
A space diversity receiving system is described which eliminates the low frequency phase modulation component at the intermediate frequency stage output. Received signals from two antennae are...
4005426 Signal processing method and apparatus  
An adaptive signal processor including a network that adjusts itself on the basis of power maximization to resolve a raw composite input signal structure at least approximately into its separate...
3911364 Cophasing combiner with cochannel signal selector  
A diversity cophasing combiner is adapted to select a single signal from among a plurality of cochannel signals transmitted from different sources. The various sources transmit signals having PSK...
Matches 51 - 100 out of 121 < 1 2 3 >