Abstract:
Das Verfahren zum Betreiben einer mindestens eine Sendeantenne und/oder mindestens eine Empfangsantenne aufweisenden UWB-Einrichtung umfasst die folgenden Schritte: - Ansteuern der Sendeantenne (12) oder der Empfangsantenne (12') mit einem Ansteuerpulssignal (13, 13'), das eine Folge von im Wesentlichen sinusförmigen Pulsen alternierender Polarität und unterschiedlicher Amplitude aufweist und insbesondere die Wellenform eines Gaußschen Pulssignals 5ter Ordnung aufweist, - wobei der Sendeantenne (12) alternierend Strompulse unterschiedlicher Polarität und verschiedener Größe zuführbar ist, indem mit der Sendeantenne (12) gekoppelte elektronische erste Schaltereinheiten (16), die den Amplituden der zu erzeugenden Pulse zugeordnete Widerstände aufweisen, ein- und ausgeschaltet werden, - wobei jede erste Schaltereinheit (16) eine vorgebbare, insbesondere gleiche, Anzahl an ersten Schalttransistoren (18,19) mit jeweils im Wesentlichen gleichen Einschaltwiderstandswerten (R) aufweist, - wobei der Widerstand einer ersten Schaltereinheit entweder durch Verwendung lediglich eines der ersten Schalttransistoren (18,19) oder durch Verwendung mehrere erster Schalttransistoren (18,19), die parallel geschaltet werden, eingestellt wird und - wobei die ersten Schaltereinheiten (16) gemäß einem vorgebbaren Zeitschema sequenziell und jeweils für ein Ansteuerzeitintervall vorbestimmter Länge angesteuert werden.
Abstract:
Certain aspects of the present disclosure relate to a method for equalizing a pulse signal corrupted by a noise and by various channel effects for obtaining a signal based on the periodic-sinc pulse, which is suitable for Finite Rate of Innovation (FRI) processing applied at a receiver of a pulse-based communication system (e.g., an Ultra-Wideband receiver).
Abstract:
A communication device for transmitting data to an other communication device via a transmission channel, includes a communication characteristic acquisition section which acquires a communication characteristic of the transmission channel, and a frame length control section which controls a frame length of a communication frame storing the data based on the communication characteristic of the transmission channel.
Abstract:
A multicarrier transceiver system for transmission of an information data signal over a communication line is provided. The transceiver system comprises a transmitter and a receiver. The transmitter includes a forward error-correcting system, a synthesis filter bank, and an overlapping unit. The overlapping unit includes a parallel adder, a modulo-calculator, a comparator, a switch, and a shift register. The overlapping unit is configured for (i) starting the overlapping from storing in the shift register zero values; (ii) cyclically calculating by the modulo-calculator for each modulated subchannel non-overlapped wavelet a maximal magnitude of a wavelet amplitude; (iii) comparing by the comparator the maximal magnitude of the wavelet amplitude with a predetermined value, and if the maximal magnitude does not exceed the predetermined value, adding data representing the modulated subchannel non-overlapped wavelet to the shift register, otherwise discarding the wavelet by the switch; (iv) shifting in the shift register for every cycle the data stored in the shift register on a predetermined number P of points; (v) providing every cycle the data from first P points of the shift register to the communication line for transmitting therethrough; (vi) filling the last P points of the shift register with zeros; and (vii) repeating steps (ii) to (vi) L times for providing and transmitting the entire overlapped wavelet sequence over the communication line.
Abstract:
Apparatus and methods of ultra-wideband (UWB) communication are provided. In one embodiment, an ultra-wideband receiver (3600) receives a serial data stream comprising a plurality of ultra-wideband pulses. A serial to parallel converter (S/P) that converts the serial data stream into a plurality of parallel data streams, which are then matched. A combiner (SUM) then combines the data streams, which are then fed to an equalizer that includes a hard decision element, a past decision element and a future decision element. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.
Abstract:
A diversity circuit uses a plurality of sub-carriers showing CINRs below a lowest threshold, so as to form a sub-carrier group so that combined CINR of the sub-carriers is above the lowest threshold. A diversity tone map generator generates a tope map associated with the lowest primary modulation scheme, based on output from the diversity circuit. A tone map generator generates a tone map associated with primary modulation schemes applied to respective sub-carriers, based on output from the diversity tone map generator.
Abstract:
Apparatus and methods of ultra-wideband (UWB) communication are provided. In one embodiment, an ultra wideband receiver receives a serial data stream comprising a plurality of ultra-wideband pulses, or signals. A serial to parallel converter then converts the serial data stream into a plurality of parallel data streams, which are then matched. A combiner then combines the data streams, which are then fed to an equalizer that includes a hard decision element, a past decision element and a future decision element. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.
Abstract:
An improved compression method with coordinated padding for various methods of modulation by which the spectral channel width occupied by the radio signal and the power spectrum density of said signal can be controlled by numerically adjusting the coding format in a coordinated manner allowing for coordinated modulation events which permits multiple transmissions in a coverage area greatly increasing the amount of information transmitted and available users.
Abstract:
A method and modem receiver for receiving serial data from a transmission link, for recovering data from the received data, and for synchronizing the receiver timing to that of the transmitter are disclosed. A receiver equalizer includes a filter (402) and quantizer (404) in the forward path and a feedback circuit (406) connecting the quantizer output to the filter input. A measuring circuit (408) is used to initialize the feedback circuit. The receiver filter, provided as a QMF wavelet filter bank, is implemented in one embodiment with a form of polyphase filtering followed by four M/2-point FFTs. The quantizer recovers data symbols and provides a quantization error feedback signal. The measuring circuit provides an approximation of phase and amplitude of isolated wavelets.
Abstract:
A transceiver system and method for transmission of information data over a communication line are described. The transceiver system comprises a transmitter and a receiver. The transmitter includes a synthesis filter bank and an overlapping unit downstream of said synthesis filter bank. The synthesis filter bank is configured for generating a set of wavelets and modulating thereof. The overlapping unit is configured for generating a multicarrier signal carrying the information data and providing thereof to the communication line. The receiver includes a separating unit and an analyzing filter bank downstream of the separating unit. The separating unit includes a separating shift register and a parallel register arranged downstream of said separating shift register. The analyzing filter bank includes an N-points FFT unit and a demodulator coupled to the N-points FFT unit. The method includes at the transmitter end the steps of providing a sequence of prototype wavelets by using N-points IFFT, modulating the sequence of the prototype wavelets by said information data, overlapping the modulated prototype wavelets to generate a multicarrier signal carrying the information data. The method includes at the transmitter end the steps of separating the overlapped wavelets from the received multicarrier signal distorted by a noise, analyzing the separated wavelets by using an N-points FFT, and demodulating spectral frequency amplitudes of the wavelets to provide the information data.