11 results about "Zero correlation" patented technology

The application discloses a method for self-interference multipath channel estimation based on zero correlation zone sequence. The method comprises the following steps: in the channel estimation stage of the simultaneous full duplex communication, a zero correlation zone sequence is sent; by using the good autocorrelation and cross-correlation characteristics of the zero correlation zone sequence, the receiver uses the same zero correlation zone sequence to slide correlate with the received signal, and the self-interference multipath channel can be accurately decomposed into several single-path channels; and the single-path channel parameters are estimated by using the correlation peak and the known zero correlation zone sequence. The application can more accurately estimate the self-interference multipath channel parameters, and ensures the self-interference cancellation ability in the multipath environment.

The present disclosure provides a method in a communication device. The method includes: determining whether a configured root sequence index falls within a predetermined range of root sequence indices, wherein the predetermined range is for a restricted set configuration and a zero correlation zone configuration; setting a current root sequence index to the configured root sequence index when the configured root sequence index falls within the predetermined range, or to a smallest root sequence index in the predetermined range when the configured root sequence index does not fall within the predetermined range; and generating, or attempting to generate, at least one random access preamble based on the current root sequence index.

The application provides a zero correlation parameter self-adaptive method and system of a distributed base station, and relates to the technical field of communication. The method comprises the following steps: a baseband unit measures a transmission time delay on a radio frequency unit side and acquires a total system time delay; a coverage range parameter on the radio frequency unit side is acquired; a total coverage range is calculated according to the coverage range parameter; and a corresponding zero correlation parameter is selected according to the total coverage range. The application can improve the deployment and maintenance efficiency of the base station, adapt the base station parameters in remote mountainous areas, save the maintenance cost, match the zero correlation parameter with the coverage range, and improve the wireless network communication quality and the user experience.

The present invention discloses a method for searching for zero-correlation linear discriminators in an SPN-structured block cipher algorithm designed for half-byte / byte blocks, combining linear mask set propagation and CP technology. This method integrates the advantages of existing methods, utilizing the concept of set propagation and combining CP modeling technology to achieve a complete characterization of the LAT table of an S-box using a linear mask propagated with probability 1. This method combines the advantages of existing methods while overcoming their shortcomings. Furthermore, it can fully consider the LAT table to search for conflicts between zero and non-zero sets, and between non-zero and non-zero sets. The method uses model solvability as a criterion, and can be considered together with the extension of the discriminator to form an integrated model.

The invention provides a communication method and a related device. The method comprises: a first device determines a time domain resource and a frequency domain resource, the time domain resource comprising Q time domain units, the frequency domain resource comprising K frequency domain units, Q being an integer greater than or equal to 1, and K being an integer greater than or equal to 1; the first device sends a first signal on the Q time domain units and the K frequency domain units, the value of the first signal borne on the time domain unit q and the frequency domain unit k is the product of an element q in a first sequence and an element k in a second sequence, the first sequence is a unit complex exponential sequence, and / or the second sequence is a constant modulus zero correlation sequence. By implementing the method, the low-speed target can be detected.

The invention discloses a communication method, device and system, relates to the field of communication, and aims to solve the problem that a static or low-speed target cannot be perceived. The method comprises the following steps: a first device obtains a first time domain resource comprising M time domain symbols, and sends a first signal on the M time domain symbols; wherein M is an integer greater than 1; the interval between any two time domain symbols in the M time domain symbols is greater than or equal to one time domain symbol; a first signal sent on a time domain symbol a in the M time domain symbols is a product of the second signal and an element a in the scrambling code sequence; the time domain symbol a is a time domain symbol with an index a in the M time domain symbols; the element a in the scrambling code sequence is an element with an index a in the scrambling code sequence; a is an integer greater than or equal to 0, and a is an integer less than M; the length of the scrambling code sequence is M, and the scrambling code sequence is obtained according to a constant modulus zero correlation sequence. The scheme of the invention can be widely applied to the fields of communication technology, artificial intelligence, Internet of Vehicles, smart home networking and the like.

A communication method, an apparatus and a system, which relate to the field of communications, and which are used for solving the problem of stationary or low-speed targets being unable to be sensed. The method comprises: a first device acquires a first time domain resource comprising M time domain symbols, and sends a first signal on the M time domain symbols, wherein M is an integer greater than 1; an interval between any two of the M time domain symbols is greater than or equal to one time domain symbol; the first signal sent on a time domain symbol a amongst the M time domain symbols is a product of a second signal and an element a in a scrambling code sequence; the time domain symbol a is a time domain symbol having an index being a amongst the M time domain symbols; the element a in the scrambling code sequence is an element having an index being a in the scrambling code sequence; a is an integer greater than or equal to 0, and a is an integer less than M; the length of the scrambling code sequence is M, and the scrambling code sequence is obtained on the basis of a constant amplitude zero correlation sequence. The solution of the present application can be widely applied to the technical fields of communications, artificial intelligence, Internet of Vehicles, smart home networking, etc.

The invention relates to the technical field of information and communication for supervision purposes, and particularly discloses an agricultural product traceability coding method and system based on a zero correlation region sequence. According to the scheme, the agricultural product traceability information is mapped into the sequence index and synthesized into the final code by generating the sequence set meeting the zero correlation region characteristic, and efficient decoding and verification are achieved through correlation operation. According to the method, on the premise that a high-complexity encryption mechanism is not introduced, the accuracy and the anti-jamming capability of batch reading are improved, and meanwhile the resource requirement for tail end recognition equipment is lowered.

The application discloses an And-RX structure zero correlation linear distinguisher search method based on miss-from-the-middle and MILP, and models the MILP by using the miss-from-the-middle technology, and a zero correlation linear distinguisher search method with the model solvable as a judgment condition is constructed. The method solves the limitation that the search model cannot traverse all search spaces with the model unsolvable as a judgment condition, simultaneously considers the zero correlation linear distinguishers generated by indirect contradictions, and enables the new model to search more effective zero correlation linear distinguishers with longer rounds. The method has high accuracy, can give the accurate indirect contradiction positions of the zero correlation linear distinguishers while searching the zero correlation linear distinguishers, eliminates the misjudgment conditions generated based on the model unsolvable, and avoids the cumbersome process of manually deriving the indirect contradiction positions of the zero correlation linear distinguishers.

A transmission code for transmission in a transmission channel, wherein the transmission code comprises a sequence of components, each component being able to assume a first component value, a second component value and an idle value, each component representing a transmission slot, the first component value in one of the components representing the transmission of a first transmission symbol in the respective transmission slot, the second component value representing the transmission of a second transmission symbol in the respective transmission slot, the idle value representing the transmission of no transmission symbol in the respective transmission slot, the transmission code comprising a number M of at least two first groups and a plurality of second groups, each first group comprising a number N of at least two components,wherein each component of each first group can assume the first component value and the second component value, wherein all first groups have the same length, wherein each second group comprises only idle values, wherein each two consecutive first groups are separated by one of the second groups, wherein the first groups are designed such that each first group can carry one bit and that the transmission code has a zero-correlation zone property for any M bits carried by the first groups.

The application discloses a construction method and device for generating three-phase complementary triad based on Kronecker product, and belongs to the technical field of communication systems. The construction method comprises the following steps: taking a three-phase complementary triad (a, b, c) with a random length of M as a seed sequence; carrying out bit interleaving on the three-phase complementary triad (a, b, c) to generate a sequence d; taking a three-phase 3*3 complete complementary code K with a random length of N; connecting the complete complementary code K in series into three parts k1, k2 and k3; and respectively obtaining the Kronecker products of the sequence d and k1, k2 and k3. The construction device comprises a control circuit, a switch circuit, six input shift registers, three multipliers and three output shift registers. The sequence length and the zero correlation zone width of the three-phase complementary triad obtained by the application are adjustable, the three-phase aperiodic Z complementary sequence triad and the Golay complementary sequence triad with the maximum zero correlation zone width can be generated, and the application can be applied to orthogonal frequency division multiplexing transmission and channel estimation in a wireless communication process.