摘要:
A method and a device for processing a signal determine a timing phase over an observation interval of an input signal. A frequency estimation is determined based on the timing phase. A phase correction is determined for the observation interval based on the timing phase and the frequency offset. Then the phase correction is used to adjust the timing of the input signal. Also, a communication system with at least one such device is described.
摘要:
It is described a technique to compensate the in-band ripple of filters at the IFFT prior to filtering in the transmitter or, for the receiver, in the FFT after filtering. A transmitter, includes a multiplier for multiplying at least one transmitter coefficient to an input signal of an inverse Fourier transformer which is followed subsequent signal processing chain thereby reducing a ripple on the output of said signal processing chain. A receiver for receiving a transmission signal includes a signal processing chain for processing the transmission signal a multiplier for multiplying at least one receiver coefficient to an output signal of a Fourier transformer to which the output of the signal processing chain is fed to thereby reduce a ripple on said output signal of said Fourier transformer.
摘要:
Binary signals are converted at the transmission end into two optical signals which are combined into a polarization multiplex signal and are then transmitted. The transmitted polarization multiplex signal is divided at the receiving end into two polarized signal parts which are converted in a linear manner into orthogonal electrical components and are supplied to a multidimensional filter. Said multidimensional filter replaces a polarization controller, restores the signal values that correspond to the signals at the transmission end, and compensates signal distortions.
摘要:
An electrical transformer including a tank containing transformer fluid, a transformer core and winding subassembly disposed in the transformer fluid within and spaced apart from the tank. An active device, disposed in the transformer fluid within the tank, various the volume of the transformer fluid in order to reduce pressure waves generated by the vibration of the core and winding subassembly during electromagnetic operation. The active device includes at least a cell having a main body and a corrugated membrane connected to the main body in order to realize a sealed container able to maintain a low pressure atmosphere inside, and an actuator placed inside the sealed container and solidly connected to the corrugated membrane.
摘要:
An apparatus for optical communication and optical communication method are provided, the method comprising the steps of generating an optical signal for transmitting the sequence of information data, transmitting the sequence of information data as a sequence of transmit matrices, S(k) being the k-th transmit matrix and k being a positive integer, and wherein the sequence of transmit matrices is transmitted through an optical channel characterized by a unitary channel matrix H, receiving a sequence of receive matrices, the k-th receive matrix R(k) being expressed as: R(k)=H·S(k)+N(k) wherein k is a positive integer and N(k) is a complex matrix of noise samples and providing a sequence of decision matrices, the k-th decision matrix D(k) being expressed as: D(k)=RH(k−1)R(k).
摘要:
A first optical data signal is transmitted on a first data carrier from a first network element. First service information is transmitted from a first service by means of a first optical service signal on a first service carrier. A second optical data signal is transmitted on a second data carrier from a second network element, and second service information is transmitted by a second optical service signal on a second service carrier. An offset between a frequency of the first data carrier and a frequency of the first service carrier is substantially equal to an offset between a frequency of the second data carrier and a frequency of the second service carrier.
摘要:
Two data signals are subjected to a binary differential phase modulation and transmitted as POLMUX multiplex signals. The types of modulation are selected in such a way that they are orthogonal in relation to each other and do not influence each other during the demodulation of the signals. There is thus no need to regulate the polarization on the receiving side.
摘要:
A method for phase recovery in a system that includes a clock recovery unit and an estimation unit. The clock recovery unit of the system has a first phase detector unit. The estimation unit has a second phase detector unit and it is configured to estimate a gain of the second phase detector unit. The estimation unit and the clock recovery unit are configured to operate in parallel.
摘要:
A signal processing method and a signal processing arrangement for coherent receivers are provided. The method includes the steps of receiving a coherent complex signal, extracting orthogonal in-phase and quadrature signal components from the coherent complex signal, quantizing the orthogonal signal components independently, combining the quantized orthogonal signal components as real and imaginary part of a complex number resulting in a first signal, and soft differential decoding the first signal resulting in a second signal.
摘要:
Demodulating an optical Differential Phase-Shift Keying (DPSK) signal is accomplished using a self-homodyne receiver for receiving the optical signal. A converter converts the optical signal received by the self-homodyne receiver into a representative electrical signal. A processor that processes the representative electrical signal using decision feedback multi-symbol detection in order to obtain a decision variable that indicates a differential phase-shift in the optical signal.