Ceragon Networks Ltd. Patent applications |
Patent application number | Title | Published |
20140126664 | USING SEQUENCES FOR SYMBOL TIMING SYNCHRONIZATION IN SINGLE-CARRIER MODULATION MIMO COMMUNICATION SYSTEMS - A method for symbol timing synchronization in multiple-input multiple-output (MIMO) communication, the method including transmitting a first symbol sequence including a preamble symbol sequence S1 from a first transmitting location, transmitting a second symbol sequence from a second transmitting location, the first and second symbol sequences being modulated onto a same carrier frequency, receiving a first mixture of the first and the second symbol sequences at a first receiving location, cross correlating the first mixture with a symbol sequence P1 thereby producing a first correlation output, and determining a first timing offset for receiving the first symbol sequence based, at least in part, on the first correlation output. Related apparatus and methods are also described. | 05-08-2014 |
20130034063 | COMBINATIONS OF SPACE-DIVERSITY, FREQUENCY-DIVERSITY AND ADAPTIVE-CODE-MODULATION - A method of communicating bi-directionally over a wireless communication system including sending data from a first location, from a first antenna, over a first plurality of signals at different frequencies, to a second plurality of spatially separated antennas at a second location, each of the second plurality of spatially separated antennas feeding a corresponding transmitter/receiver of a plurality of transmitter/receivers at the second location. A method of communicating over a wireless communication system including transmitting same data from a first location, using each one of a plurality of Adaptive Coding and Modulation (ACM) signals at different frequencies, to receivers corresponding to each one of the frequencies at a second location, receiving the transmitted signals, and combining the received signals. Related apparatus and methods are also described. | 02-07-2013 |
20120140849 | FREQUENCY REUSE IN WIRELESS POINT-TO-POINT COMMUNICATION SYSTEMS - A method for interference reduction in transmission of at least two single carrier frequency continuous communication beams including producing a first communication signal for a first digital communication link, producing a second communication signal for a second digital communication link, transmitting the first communication signal over a first continuous communication beam at a first frequency, transmitting the second communication signal over a second continuous communication beam at the first frequency, characterized by modifying the first communication signal using transmitter interference cancellation. | 06-07-2012 |
20120099432 | DECREASING JITTER IN PACKETIZED COMMUNICATION SYSTEMS - A method for decreasing jitter for at least some packets in a first packet-switched communication system including defining parameters for a communication channel wherein the parameters determine a maximum jitter level, setting up a communication channel using the parameters to provide a channel with a predefined maximum jitter level, selecting packets from the first packet-switched communication system which are to be transmitted via the defined-jitter communication channel, and transmitting the determined packets via the defined-jitter communication channel. A packet switched network operating a designated defined-jitter channel for packets requiring defined jitter. Related apparatus and methods are also described. | 04-26-2012 |
20120076086 | ASYMMETRICAL LINKS IN WIRELESS COMMUNICATIONS - A method of allocating wireless communication capacity in a wireless point-to-point link including obtaining a channel having a bandwidth for use in the wireless point-to-point link, allocating a first portion of the bandwidth for use for transmitting from a first point to a second point of the wireless point-to-point link, and allocating a second portion of the bandwidth for use for transmitting from the second point to the first point of the wireless point-to-point link, in which the bandwidth is asymmetrically assigned between the first portion and the second portion. Related apparatus and methods are also described. | 03-29-2012 |
20110293042 | COMBINING PILOT-SYMBOL-BASED PHASE ESTIMATION WITH DATA-SYMBOL-BASED PHASE ESTIMATION - A method for a receiver to estimate phase of a carrier wave, including receiving a carrier wave carrying pilot symbols and data symbols extending between the pilot symbols, determining phase of the carrier wave at received pilot symbols, and interpolating the phase of the carrier wave at points between pilot symbols based, at least in part, on an estimated phase of demodulated data symbols. Apparatus for estimate phase of a carrier wave, including a unit for determining phase of the carrier wave at received pilot symbols, and a unit for interpolating the phase of the carrier wave at points between pilot symbols based, at least in part, on an estimated phase of demodulated data symbols. Related apparatus and methods are also described. | 12-01-2011 |
20110280126 | EXTRA CAPACITY IN PATH-PROTECTED COMMUNICATION NETWORKS - A method for managing traffic in a communication network which includes a protected path including a first path and a second path, including refraining from sending redundant data along the second path, and using freed up communication capacity obtained by refraining from sending redundant data along the second path for sending other data along the second path. The above-described method and further comprising measuring path integrity, in which the refraining from sending and the using freed up communication capacity depend, at least partly, on meeting a stability criterion applied to the measured path integrity. A network management unit configured to functionally connect to a communication node configured to provide path protection by sending redundant data along a first path and a second path, configured to cause the communication node to refrain from sending redundant data along the second path, and use freed up communication capacity, obtained by causing the communication node to refrain from sending redundant data along the second path, for sending other data along the second path. Related apparatus and methods are also described. | 11-17-2011 |
20110188561 | SNR ESTIMATION - A method for estimating a Signal to Noise Ratio (SNR) in a received signal including, for a fixed first set of a plurality of samples from the received signal, providing an initial noise estimate, starting with the initial noise estimate, iteratively improving the noise estimate, and estimating SNR based, at least partly, on the fixed first set of samples from the received signal and the noise estimate. Additional related apparatus and methods are also described. | 08-04-2011 |
20110182344 | ESTIMATING INTERFERENCE IN MULTI CHANNEL SYSTEMS - A method for estimating interference between a plurality of carrier signals in a multi-channel system including injecting pilot symbols into a first carrier signal and transmitting the first carrier signal, transmitting a second carrier signal, receiving at least the first carrier signal and the second carrier signal, and estimating interference between the received first carrier signal and the received second carrier signal based, at least in part, on measuring the received first carrier signal when a pilot symbol of the first carrier signal is received. A multi-channel communication system including a plurality of transmitters for a plurality of carrier signals, a pilot symbol injector for injecting silent pilot symbols into at least one of the carrier signals, a plurality of receivers for the plurality of carrier signals, and an interference estimator configured to estimate interference between at least two of the plurality of carrier signals based, at least in part, on receiving silent pilot symbols in at least one of the at least two of the plurality of carrier signals. Related apparatus and methods are also described. | 07-28-2011 |
20110075574 | PATH PROTECTION BY SHARING CONTINUITY CHECK MESSAGES - A method for managing protection of a plurality of defined paths in a communication system including listing the defined paths, each item in the list including a defined path identifier, a defined path ingress node, a defined path egress node, and a defined path protection period, wherein some of the defined paths share an ingress node and an egress node, managing a sending of Continuity Check Messages (CCMs) along at least some of the defined paths, such that a CCM is sent every protection period, and for at least a plurality of the defined paths which share an ingress node and an egress node, managing a sharing of the protection of the plurality of the defined paths, the sharing including sending one set of CCMs, shared by the plurality of the defined paths, at a frequency based, at least in part, on a shortest one of the protection periods of the plurality of the defined paths. A method for protecting a plurality of paths which share at least one leg in a communication network, including sharing, between the paths, Continuity Check Messages (CCMs) for at least the shared leg. Related apparatus and methods are also described. | 03-31-2011 |
20100215058 | TRANSMISSION OF DATA OVER PARALLEL LINKS - A method of transmitting data over a plurality of parallel transmission links, including dividing the data into a plurality of portions, and for each one of the portions in consecutive order providing the portion to a transmitter, and sending the portion over a transmission link connected to the transmitter, wherein the providing is made according to a plan which is independent of addressing information associated with the data. A method for reassembling data from a plurality of portions of the data received over a plurality of parallel transmission links including copying a first portion, according to an order among the portions, thereby producing partially reassembled data, from each one of the plurality of parallel transmission links, copying and appending a next portion to the partially reassembled data, according to the order among the portions, and continuing the copying and appending until the data has been completely reassembled. Related apparatus and methods are also described. | 08-26-2010 |
20100215054 | MAINTAINING A CONSTANT DELAY IN POINT-TO-POINT TRANSMISSION - A system configured to transmit data at a variable transmission rate over a point-to-point link, while maintaining a substantially constant transmission delay over the point-to-point link, including a transmitter configured to add an indication of a transmission rate to the data being transmitted and to transmit the indication of the transmission rate along with the data, and a receiver configured to receive an indication of a transmission rate along with data and to read the indication of the transmission rate and including a delay compensation buffer. Related apparatus and methods are also described. | 08-26-2010 |
20100214980 | ERRORLESS AND HITLESS VARIABLE DATA RATE COMMUNICATIONS - A variable data rate wireless transmitter configured to receive input of data from a plurality of input channels and transmit at least some of the data over a variable data rate wireless point-to-point communication link, wherein portions of the data are associated with priorities, and the wireless transmitter is configured to change transmission of at least some of the portions of the data, based, at least partly, on the priorities associated with the portions of the data, and on a data rate configured for transmitting the portions of the data over the variable data rate wireless communication link. A variable data rate wireless receiver configured to receive data over a variable data rate wireless point-to-point communication link, including a delay compensation buffer configured to maintain a substantially fixed delay between input of the data into a wireless transmitter transmitting the data and output of the data from the delay compensation buffer, by maintaining a suitable output rate of the data from the delay compensation buffer. Related apparatus and methods are also described. | 08-26-2010 |
20100214910 | PROTECTED VARIABLE DATA RATE COMMUNICATION SYSTEMS - A protected point-to-point ACM communication system including at least a first component and a second component configured to provide live functionality and backup functionality for each other, at least a first receiver and a second receiver configured to receive an ACM transmission, one or more quality detectors configured to estimate quality of the received transmission of at least the first receiver and the second receiver, wherein at least one of the quality detectors is configured to estimate the quality of the received transmission using blind detection, and a controller configured to switch the live functionality of the protected point-to-point ACM communication system from one of the first component and the second component to another of the first component and the second component, based, at least partly, on the estimated qualities of the received transmissions of at least the first receiver and the second receiver. Related apparatus and methods are also described. | 08-26-2010 |
20100142560 | DATA PACKET HEADER COMPRESSION - A transmitter for transmitting data packets including a Media Access Control (MAC) address extractor configured to extract one or more MAC addresses from packet headers included in data packets, a MAC compression unit configured to provide compressed MAC data including one or more pointers associated with each of the one or more extracted MAC addresses respectively, a packet modifier configured to modify the data packets by adding the compressed MAC data to the data packets, and a transmission unit configured to transmit the modified data packets. A receiver for receiving data packets including compressed MAC data, the compressed MAC data including pointers associated with MAC addresses, including a receiving unit configured to receive data packets, a compressed MAC data extractor configured to find and extract compressed MAC data from received data packets, and a packet modifier configured to modify the received data packets by removing the compressed MAC data from the received data packet. Related apparatus and methods are also described. | 06-10-2010 |
20080279089 | Multiplexing separately modulated channels - A method of data transmission which includes providing a plurality of data streams, having different content, modulating the different data streams by respective modulators, multiplexing the modulated data streams into a single data stream alternately in time, such that the resultant stream includes at any specific time signals from fewer than all the data streams and transmitting the multiplexed single data stream onto a transmission channel. | 11-13-2008 |