摘要:
It is disclosed a method for digitally modulating a signal in a communication network. The method comprises selecting a modulation scheme represented by a given constellation of points within the complex plane, each point having a given initial position comprising an I-coordinate and a Q-coordinate in the complex plane, the given constellation having a mean symbol energy, and deforming at least one of the constellation points around its initial position so as to optimize a performance function while keeping constant the mean symbol energy
摘要:
A method is disclosed for mapping data information (Ethernet) from an input port (PT(#X)) to multiple members of a concatenated group (VCG(#1)). The method includes the steps of receiving configuration information indicating a rule for assigning the input port to the multiple members of the concatenated group, calculating (PU) a write address sequence taking into account the number of the multiple members of the concatenated group and calculating a read address sequence taking into account the configuration information and the write address sequence, storing the read address sequence into an address memory (AM), receiving the data information from the input port, storing at least part of the received data information into a data memory (DM) according to the write address sequence, reading, from the data memory, information of the multiple members of the concatenated group according to the read address sequence stored into the address memory.
摘要:
Embodiments relate to an apparatus (100; 300; 400; 500; 600) for recovering a phase of a received signal (S in ) carrying pilot and information symbols, wherein the received signal has been transmitted over a communication channel (200), the apparatus comprising a phase estimator (110) operable to determine a phase estimate (115) of a phase of the communication channel using the received signal, wherein the phase estimator (110) commits a phase slip with a phase slip probability (P S , P T ) depending on the communication channel (200); a demodulator (120) operable to determine demodulated pilot and information symbols (125) based on a coherent reception of the received pilot and information symbols using the determined phase estimate (115); a phase slip detector (130; 330; 430; 530; 630) operable to detect the phase slip based on a phase difference between at least one demodulated pilot symbol and at least one corresponding transmitted pilot symbol; and a phase corrector (140; 340; 440; 540) operable to correct a phase of demodulated information symbols based on the detected phase slip.
摘要:
It is disclosed a method of demapping a tributary from a first frame into a second frame, the first frame comprising a plurality of tributary words and a synchronization word, the method comprising: providing a first and a second counters; increasing the first counter by a first value at each clock cycle of the second frame; and performing reading operations according to the second counter. It further comprises: generating synchronization information according to the synchronization word; according to the synchronization information, performing a change of state between a first state and a second state, wherein, in the first state, the second counter is synchronized to the first counter at each clock cycle of the second frame, and in the second state, the second counter is synchronized to the first counter at a predetermined instant of the second frame and the second counter is increased by a second value at each clock cycle of the second frame wherein the reading operation is performed.
摘要:
Proposed is an optical transmitter arrangement of a self-seeding concept with colourless transmitters in an optical access network. An optical transmission unit generates an optical signal comprising a first signal component having a polarization state that lies within a first polarization plane and furthermore comprising a second signal component having a polarization state that lies within a second polarization plane orthogonal to the first polarization plane.
摘要:
It is disclosed a forward error correction decoder for a network element of a communication network. The decoder comprises a first decoding stage configured to receive an input data block, the first decoding stage comprising a plurality of decoding units connected in cascade, each of said decoding units being configured to perform one iteration of a forward error correction decoding procedure on said input data block. The first decoding stage is further configured to output an output data block. The decodes also comprises a second decoding stage comprising a further decoding unit configured to: receive the output data block in case the output data block is not correct; and perform a number of further iterations of the forward error correction decoding procedure on the output data block until a termination condition is fulfilled, the number of further iterations being equal to or higher than 1.