Abstract: A capability is provided for securely transferring a file within network-based storage. A capability is provided for securely transferring a user file of a user from a first server to a second server. The first server may be associated with a first service provider and the second server may be associated with a second service provider. The secure transfer of a user file from the first server to the second server may be performed based on a One-Click File Transfer capability in which only a single click by the user is needed in order for the user file to be transferred. The secure transfer of a user file from the first server to the second server may be performed based on a Zero-Click File Transfer capability in which the user file may be transferred without any interaction by the user.

Abstract: At least one example embodiment discloses a method of determining crosstalk for at least one first line in a communication system having a plurality of second lines. The method includes obtaining at least one pilot matrix representing a sequence of pilot signals and transmitting pilot signals across the plurality of second lines in accordance with the at least one pilot matrix. The method further includes obtaining measurement vectors for the at least one first line on a plurality of subcarriers, in response to the transmitted pilot signals, determining a weighted vector, the weighted vector being a weighted combination of the measurement vectors and determining a crosstalk coupling vector based on the determined weighted vector.

Abstract: A system, for example an optical communication system, includes an optical transmitter. The transmitter is configured to direct towards an optical fiber a spatially multiplexed optical signal. The optical fiber is configured to convey data via the multiplexed optical signal from the transmitter to a receiver. The transmitter is configured to set a signal-to-noise ratio (SNR) or a transmission capacity of the multiplexed optical signal to achieve a predetermined secrecy capacity of the transmission.

Abstract: In one aspect, a compressive sampling encoder comprises matrix determination circuitry configured to determine a particular sampling matrix selected from a codebook comprising a plurality of sampling matrices. The compressive sampling encoder further comprises sampling circuitry coupled to the matrix determination circuitry and configured to apply the particular sampling matrix to a first signal to generate a second signal, and encryption circuitry configured to receive an identifier of the particular sampling matrix and to encrypt the identifier of the particular sampling matrix. The compressive sampling encoder provides at one or more outputs thereof the second signal and the encrypted identifier of the particular sampling matrix. Other aspects include a compressive sampling decoder, compressive sampling encoding and decoding methods, and associated computer program products.

Abstract: At least one example embodiment discloses a method of determining crosstalk for at least one first line in a communication system having a plurality of second lines. The method includes obtaining at least one pilot matrix representing a sequence of pilot signals and transmitting pilot signals across the plurality of second lines in accordance with the at least one pilot matrix. The method further includes obtaining measurement vectors for the at least one first line on a plurality of subcarriers, in response to the transmitted pilot signals, determining a weighted vector, the weighted vector being a weighted combination of the measurement vectors and determining a crosstalk coupling vector based on the determined weighted vector.

Abstract: At least one example embodiment discloses a method of determining crosstalk for a joining line in a communication system having a plurality of current active lines. The method includes obtaining a number of disturber lines among the plurality of current active lines, the number of disturber lines being less than a number of the plurality of current active lines, obtaining a pilot matrix, a first dimension of the pilot matrix being based on the number of disturber lines, the pilot matrix representing a sequence of pilots to be transmitted across the plurality of current active lines and the joining line, the first dimension being a number of time instances, the number of time instances being less than the number of the plurality of active lines and determining a crosstalk coupling vector for the joining line based on the pilot matrix.

Abstract: At least one example embodiment discloses a method of determining crosstalk for a joining line in a communication system having a plurality of current active lines. The method includes obtaining a number of disturber lines among the plurality of current active lines, the number of disturber lines being less than a number of the plurality of current active lines, obtaining a pilot matrix, a first dimension of the pilot matrix being based on the number of disturber lines, the pilot matrix representing a sequence of pilots to be transmitted across the plurality of current active lines and the joining line, the first dimension being a number of time instances, the number of time instances being less than the number of the plurality of active lines and determining a crosstalk coupling vector for the joining line based on the pilot matrix.

Abstract: A transmitter, receiver and method for mitigating the cliff effect for content delivery over a heterogeneous network. In one embodiment, the transmitter includes: (1) a joint encoder configured to receive a content unit and generate multiple quantized representations thereof and (2) an erasing quantizer associated with the joint encoder and configured to select, from uncoded symbols representing the content unit, multiple subsets of the uncoded symbols. The multiple quantized representations and the multiple subsets of the uncoded symbols are associated to form multiple, independently quantized, correlated descriptions of the content unit. Two design parameters may be employed to control the level of correlation.

Abstract: Various embodiments provide for detection of tapping of an optical signal. In one embodiment an optical fiber includes a cladding region and first and second core regions. The first core region has a first core medium having a first mode-dependent loss (MDL) figure of merit. The second core region has a second core medium having a second different MDL figure of merit. Tapping of the optical signal may be determined to occur when the MDL of the first and second optical signals differs by a predetermined threshold value.

Abstract: A capability is provided for securely transferring a file within network-based storage. A capability is provided for securely transferring a user file of a user from a first server to a second server. The first server may be associated with a first service provider and the second server may be associated with a second service provider. The secure transfer of a user file from the first server to the second server may be performed based on a One-Click File Transfer capability in which only a single click by the user is needed in order for the user file to be transferred. The secure transfer of a user file from the first server to the second server may be performed based on a Zero-Click File Transfer capability in which the user file may be transferred without any interaction by the user.

Abstract: Various embodiments provide secure optical transmission of data. Noise may be added to optical signals transmitted by spatial paths of a multimode optical fiber. The noise may be added electrically prior to modulation, or optically after modulation. In some embodiments a transmitter and a receiver cooperate to maintain a noise level sufficient to place a tapped signal in a noise regime that provides a predetermined level of data security.

Abstract: Various embodiments provide for detection of tapping of an optical signal. In one embodiment an optical fiber includes a cladding region and first and second core regions. The first core region has a first core medium having a first mode-dependent loss (MDL) figure of merit. The second core region has a second core medium having a second different MDL figure of merit. Tapping of the optical signal may be determined to occur when the MDL of the first and second optical signals differs by a predetermined threshold value.

Abstract: A transmitter, receiver and method for mitigating the cliff effect for content delivery over a heterogeneous network. In one embodiment, the transmitter includes: (1) a joint encoder configured to receive a content unit and generate multiple quantized representations thereof and (2) an erasing quantizer associated with the joint encoder and configured to select, from uncoded symbols representing the content unit, multiple subsets of the uncoded symbols. The multiple quantized representations and the multiple subsets of the uncoded symbols are associated to form multiple, independently quantized, correlated descriptions of the content unit. Two design parameters may be employed to control the level of correlation.

Abstract: In one aspect, a compressive sampling encoder comprises matrix determination circuitry configured to determine a particular sampling matrix selected from a codebook comprising a plurality of sampling matrices. The compressive sampling encoder further comprises sampling circuitry coupled to the matrix determination circuitry and configured to apply the particular sampling matrix to a first signal to generate a second signal, and encryption circuitry configured to receive an identifier of the particular sampling matrix and to encrypt the identifier of the particular sampling matrix. The compressive sampling encoder provides at one or more outputs thereof the second signal and the encrypted identifier of the particular sampling matrix. Other aspects include a compressive sampling decoder, compressive sampling encoding and decoding methods, and associated computer program products.

Abstract: Significant improvement in Raptor codes and punctured LDPC codes are obtainable by use of the invention. In both a transmission scheme for Raptor-encoded or LDPC-encoded information, a dynamic adjustment approach is employed. A fraction of a codeword or information frame is transmitted. A feedback signal is sent from the receiver to the transmitter indicating either 1) successful decoding, or 2) failure to decode and/or a feedback signal indicative of a statistical measure of transmission channel quality. If decoding fails, a further portion of the codeword or frame is sent. The intensity and/or size of the fraction is adjusted based on the feedback signal. In one embodiment, a specific range for probabilities employed in the encoding process for Raptor codes provides the ability to increase transmission throughput. Further it has been found that the advantageous Raptor codes are useful in noise conditions where even the improved punctured LDPC codes of the invention begin to degrade.

Abstract: The present invention provides a method for implementation in a first sensor node that is a member of a sensor node network including a plurality of sensor nodes. One embodiment of the method includes accessing, at the first sensor node, information indicative of a sensing operation performed by at least one of the plurality of sensor nodes. This embodiment of the method also includes randomly selecting, at the first sensor node, a second sensor node that is adjacent the first sensor node in the sensor node network. The random selection is made independent of a location of the second sensor node. This embodiment of the method further includes transmitting the information indicative of the sensing operation from the first sensor node to the second sensor node.

Abstract: A method is provided to accurately predict the probability of successfully recovering frames of (coded) information received over a wireless link, without having to decode the frame. This method includes receiving a first encoded signal and predicting link errors based on characteristics of the first encoded signal and variations in these characteristics before decoding the first encoded signal.

Abstract: Significant improvement in Raptor codes and punctured LDPC codes are obtainable by use of the invention. In both a transmission scheme for Raptor-encoded or LDPC-encoded information, a dynamic adjustment approach is employed. A fraction of a codeword or information frame is transmitted. A feedback signal is sent from the receiver to the transmitter indicating either 1) successful decoding, or 2) failure to decode and/or a feedback signal indicative of a statistical measure of transmission channel quality. If decoding fails, a further portion of the codeword or frame is sent. The intensity and/or size of the fraction is adjusted based on the feedback signal. In one embodiment, a specific range for probabilities employed in the encoding process for Raptor codes provides the ability to increase transmission throughput. Further it has been found that the advantageous Raptor codes are useful in noise conditions where even the improved punctured LDPC codes of the invention begin to degrade.

Abstract: A method is provided to accurately predict the probability of successfully recovering frames of (coded) information received over a wireless link, without having to decode the frame. This method, which consists of three steps, requires only limited information about the received signals and the forward error correction code and retransmission scheme being used. First, the signal to noise ratio (SNR) of each of the received signals is measured, where the average SNR is determined for multiple segments that together constitute the frame. Next, an algorithm is employed that takes these SNR values as inputs and determines the so-called effective SNR. The algorithm translates the measured SNR values using an appropriate convex metric, and subsequently combines the resulting values, thereby factoring in the effects of fading, multi-path, and other signal degradations.

Abstract: A method for assigning a color symbol to an image pixel comprises selecting a luminance value from a discrete set of quantized luminance values; selecting a chrominance value from an ordered discrete set of quantized chrominance values; and composing a color symbol from an index of the selected luminance value and an index of an ordinal position of the selected chrominance value. In particular embodiments of the invention, each discrete chrominance value is selected from a Fibonacci lattice on a constant-luminance plane in a perceptually uniform color space such as Lab or Luv.