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253 results about "Orthogonal sequence" patented technology

Method of transmitting preamble for synchronization in a MIMO-OFDM communication system

A method and apparatus for transmitting a preamble for frame synchronization and channel estimation in a MIMO-OFDM communication system are provided. An OFDM communication system using Q transmit antennas generates a base preamble sequence including a CP and an orthogonal sequence. If Q≦a predetermined number M, a preamble sequence for a kth antenna is S(t−(k−1)T / Q). If Q>M and k≦M, the preamble sequence transmitted for the kth antenna is S(t−(k−1)T / Q). If Q>M and k>M, the preamble sequence for the kth antenna is (−1)(ps−1)S(t−(k−1)T / Q). Here, S(t) is the orthogonal sequence, T is the period of the orthogonal sequence, and PS is an index indicating a transmission period of the preamble sequence. The preamble sequences are at least twice transmitted from the Q transmit antennas.
Owner:SAMSUNG ELECTRONICS CO LTD

Real time clock distribution and recovery

The present technology relates to protocols relative to utility meters associated with an open operational framework. More particularly, the present subject matter relates to protocol subject matter for advanced metering infrastructure, adaptable to various international standards, while economically supporting a 2-way mesh network solution in a wireless environment, such as for operating in a residential electricity meter field. The present subject matter supports meters within an ANSI standard C12.22 / C12.19 system while economically supporting a 2-way mesh network solution in a wireless environment, such as for operating in a residential electricity meter field, all to permit cell-based adaptive insertion of C12.22 meters within an open framework. Cell isolation is provided through quasi-orthogonal sequences in a frequency hopping network. Additional features relate to apparatus and methodology subject matters relating to real time clock distribution and recovery.
Owner:ITRON GLOBAL SARL

Multi-user information co-channel sending method and device, and multi-user information co-channel receiving method and device

The invention discloses a multi-user information co-channel sending method and device, and a multi-user information co-channel receiving method and device. The multi-user information co-channel sending method comprises following steps: dividing N users into K groups; generating L superposition symbols according to the modulation symbols of each piece of user information in each group, wherein the K, N and L are integers, the L is more than or equal to K, the K is more than or equal to 1, the N is more than or equal to 2, and the L is not equal to 1; separately carrying out spread spectrum extension on the L superposition symbols by using different sequences in L orthogonal sequences with lengths of L, thus obtaining L symbol sequences; combining the L symbol sequences, thus obtaining combined symbol sequences; and sending transmitting signals formed by the combined symbol sequences. Through the methods and the devices of the invention, the problem that during NOMA downlink sending, in an actual fading channel, the risk of error propagation is great if symbol-level SIC is performed in the demodulation process of the terminal, which causes performance degradation, is solved; and the access performance is improved.
Owner:ZTE CORP

Highly orthogonal universal sequences for use in nucleic acid assays

The invention provides a set of highly orthogonal six-code universal sequences for use in bDNA singleplex and multiplex nucleic acid hybridization assays. The six-code orthogonal sequences do not cross-hybridize and thus, minimize or eliminate the 3-mer cross-hybridization inherent in the second and third generation bDNA assays. The highly orthogonal universal sequences may be used in singleplex or multiplex bDNA assays quantitatively and qualitatively to determine mRNA levels in a sample; to screen for and genotype targets, such as viruses, that are present in low volumes in a sample; to screen for and genotype SNPs; and to measure changes in the amount of a gene in a sample such as when gene amplifications or deletions occur. The highly orthogonal universal sequences may also be used as universal capture probes to selectively bind assay components in a way that facilitates their further analysis.
Owner:SIEMENS HEALTHCARE DIAGNOSTICS INC

Beam position and phase measurement system and method based on full digitalization technology

ActiveCN104181577ASimple designAvoid complicated simulation processingX/gamma/cosmic radiation measurmentOrthogonal sequenceSystem structure
The invention discloses a beam position and phase measurement system and method based on the full digitalization technology. The system comprises a simulation front end part and a digital processing part. In the simulation front end part, the undersampling technology is utilized for carrying out undersampling on input signals from a beam position detector, the sampling rate is accurately adjusted through a phase-locked loop digitally controlled and is made to be four times larger than the digital intermediate frequency signal frequency obtained after the input signals of the beam position detector are undersampled, and a digital orthogonal sequence of the input signals of the beam position detector is directly obtained. In the digital processing part, digital processing is carried out on the digital orthogonal sequence obtained through undersampling of the simulation front end part, the beam position and the phase position of an accelerator are measured, and the phase position is modified on line in real time. Digital processing modules are integrated on a single chip FPGA, and the system structure is greatly simplified. By means of the appropriate sampling rate, the orthogonal sequence of the input signals is directly obtained after ADC sampling, and the signal phase position and amplitude digital processing algorithm is greatly simplified.
Owner:UNIV OF SCI & TECH OF CHINA

Method for transmitting, receiving and processing information, base station and user equipment

The embodiment of the invention provides a method for transmitting, receiving and processing information, a base station and user equipment. In the embodiment of the invention, UE (user equipment) can respectively extend four groups of modulating symbols to make at least one of two transmitted data sequence elements corresponding to the same subcarrier in two transmitted data sequences mapped on each subcarrier of a PRB (physical resource block) with a PUCCH (physical uplink control channel) corresponding to the same time slot of two antenna ports be 0, so that the UE can only use the same extending sequence to extend the two transmitted data sequences; in addition, first pilot frequency sequences placed on SC-FDMA (single carrier-frequency division multiple access) symbols for pilot frequency transmission in each time slot on the two antenna ports are orthogonal sequences after expansion of the same pilot frequency sequence, so that the two antenna ports can use the same pilot frequency sequence. Therefore, the uplink resource in the same PRB can support that the number of the UE which can send a control signaling in a PUCCH format 3 is doubled compared with the prior art, so that the resource utilization rate is improved.
Owner:HUAWEI TECH CO LTD

Method for transmitting ACK/NACK messages

The invention provides a method for transmitting ACK / NACK messages. As for each ACK / NACK message in multiple ACK / NACK messages corresponding to uplink transmission of multiple user equipment, a base station determines index position of the ACK / NACK message in downlink control information and puts the ACK / NACK message at the index position. Then, the ACK / NACK message is coded by the use of orthogonal sequence and repetition coding. Finally, the base station sends the downlink control information to the multiple user equipment. By the method provided by the invention, overhead of the ACK / NACK corresponding to the uplink transmission can flexibly be controlled and optimized, and the balance between flexibility of resource allocation and robustness of ACK / NACK transmission is realized. In addition, the method has little influence on existing standards and a current system and has good compatibility, and the method also can be applied in a scene of NCT lacking PHICH.
Owner:ALCATEL LUCENT SHANGHAI BELL CO LTD

Training and synchronization sequences for wireless systems with multiple transmit and receive antennas used in CDMA or TDMA systems

Orthogonal sequences can be developed and used for use training and synchronizing in CDMA and TDMA systems. In particular, once a sequence is developed that has the length of the product of the channel length and the number of transmit antennas, the sequence is offset by a different amount for each transmit antenna. For example, each sequence could be offset by a multiple of the channel length for each transmit antenna, where the multiple ranges from 0 to N−1, where N is the number of transmit antennas. Furthermore, by not using exactly the same amount of offset shifting for each transmit antenna, e.g., not having each signal offset by the channel length, but keeping the overall total shifting the same, e.g., the average of each shift is the channel length, it is possible to determine at a receiver from which transmit antenna a particular signal originated.
Owner:ALCATEL-LUCENT USA INC

Communication system and method with orthogonal block encoding

A communication system and method with orthogonal, block encoding is provided. Encoded signals are transmitted by repeating transmissions of symbol blocks with a phase or sign change selected for each block from a sequence of phase or sign changes. Different symbols are transmitted using orthogonal sequences. The decoding uses different orthogonal sequences for separating the received encoded signals into corresponding separate channels. The orthogonal encoding is removed from the encoded transmitted signals and corresponding ones of the repeated symbols are added in successively received repeated blocks after the orthogonal encoding is removed. A transmitter uses a digital source encoder to encode information into symbols, and each symbol is repeated a preselected number of times to successively produce groups of repeated bits. Each repeat bit is changed in phase or sing by application of a sign or phase change determined by a selected assigned orthogonal code associated with the transmitter. The sign changed bits are interleaved from a number of such groups to successively generate a number of blocks, each composed of the different sign or phase changed bits of the preselected number of repeated groups and having a collective sign or phase change corresponding to a common sign change or phase shared by all bits of the block. The interleaved blocks then modulate a radio signal for transmission.
Owner:ERICSSON INC

Communication system and method with orthogonal block encoding

A communication system and method with orthogonal, block encoding is provided. Encoded signals are transmitted by repeating transmissions of symbol blocks with a phase or sign change selected for each block from a sequence of phase or sign changes. Different symbols are transmitted using orthogonal sequences. The decoding uses different orthogonal sequences for separating the received encoded signals into corresponding separate channels. The orthogonal encoding is removed from the encoded transmitted signals and corresponding ones of the repeated symbols are added in successively received repeated blocks after the orthogonal encoding is removed. A transmitter uses a digital source encoder to encode information into symbols, and each symbol is repeated a preselected number of times to successively produce groups of repeated bits. Each repeat bit is changed in phase or sing by application of a sign or phase change determined by a selected assigned orthogonal code associated with the transmitter. The sign changed bits are interleaved from a number of such groups to successively generate a number of blocks, each composed of the different sign or phase changed bits of the preselected number of repeated groups and having a collective sign or phase change corresponding to a common sign change or phase shared by all bits of the block. The interleaved blocks then modulate a radio signal for transmission.
Owner:TELEFON AB LM ERICSSON (PUBL)
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