213 results about "Sequence structure" patented technology

A system and method for executing a plurality of graphical code portions as a timed sequence is described. The graphical code portions may be included in a graphical program and configured with information specifying a sequential order of execution and execution timing information. During execution of the graphical program, the graphical code portions are executed sequentially in the sequential order and in accordance with the execution timing information. In one embodiment a timed sequence structure node may be utilized to specify the timed sequence. For example, the user may include the timed sequence structure node in the graphical program and associate the plurality of graphical code portions with the timed sequence structure node such that the timed sequence structure node species a sequential order of execution for the graphical code portions. The user may also configure the timed sequence structure node with execution timing information for one or more of the graphical code portions.

A class of soft-input soft-output demodulation schemes for multiple-input multiple-output (MIMO) channels, based on the sequential Monte Carlo (SMC) framework under both stochastic and deterministic settings. The stochastic SMC sampler generates MIMO symbol samples based on importance sampling and resampling techniques, while the deterministic SMC approach recursively performs exploration and selection steps in a greedy manner. By exploiting the artificial sequential structure of the existing simple Bell Labs Layered Space Time (BLAST) detection method based on nulling and cancellation, the proposed algorithms achieve an error probability performance that is orders of magnitude better than the traditional BLAST detection schemes while maintaining a low computational complexity. Performance is comparable with that of the sphere decoding algorithm, with a much lower complexity. Both the stochastic and deterministic SMC detectors can be employed as the first-stage demodulator in an iterative or turbo receiver in coded MIMO systems.

The invention discloses a pilot sequence structure in an MIMO-OFDM / OQAM (Multi-input Multi-output-Orthogonal Frequency Division Multiplexing / Offset Quadrature Amplitude Modulation) system and a channel estimation method. Different pilot sequences are adopted by different antennae, the pilot sequence of each antenna is composed of three segments of symbol sequences, the length of each symbol sequence accords with the number of subcarriers, wherein the first segment of symbol sequence and the third segment of symbol sequence are all-zero symbol sequences, pilot signals are arranged at equal intervals in the second segment of symbol sequence, the pilot signal positions of all the antennas are different, the symbols of the pilot signals are randomly chosen from a candidate symbol set, and the interval between the pilot signals is two times the number of the antennas. The channel estimation method put forward by the invention can be utilized to eliminate inter-symbol interference and inter-subcarrier interference caused by multipath interference, so that the accuracy of the channel estimation of the MIMO-OFDM / OQAM system can be increased. Meanwhile, the pilot sequence structure decreases the peak-to-average power ratio of transmitted signals, and can meet the linear dynamic range of a radio frequency front-end high power amplifier and decrease the linearity requirement of the MIMO-OFDM / OQAM system on the high power amplifier.

The invention provides a new method for OFDM time synchronization, which is based on a training sequence structure and a corresponding synchronization algorithm. A method of superimposing the OFDM synchronization training sequence to cyclic prefixes of transmission data is used for saving extra transmission cost; relevant peak value is more prominent by combing the training sequence structure and utilizing positive and negative alternating characteristic of the training sequence. Both the synchronization accuracy and the operating speed of the algorithm are increased by combining the corresponding synchronization algorithm.

The invention discloses a sequence structure with low peak-to-average power ratio for the channel estimation of an OFDM / OQAM system, and a method for performing the channel estimation by using the structure. In the structure, except that a front segment and a rear segment have a same structure according to a conventional pilot sequence (all-zero data serves as a protective segment), at least half signs (only at odd bits or even bits) of one segment or three segments in the middle are zero, and the values of the signs at any bits of the remaining parts are 1 or -1 at random. Because the values of most parts are zero and the values of the signs at any bits of the remaining parts are 1 or -1 at random, the method for the channel estimation can reduce peak-to-average power ratio while eliminating inter-sign interferences and inter-subcarrier interferences caused by multi-path interferences, the structure and the method can satisfy the linear dynamic range of a radio frequency front-end high power amplifier so as to reduce the linear requirements on the high power amplifier by the OFDM / OQAM system.

The invention provides a pilot frequency sequence structure used in OFDM / OQAM system and the construction method thereof; under the condition that two sides of pilot frequency reference channel are added by full 0 protection symbol, the odd number sequence number and even number sequence number of the sequence body part have the same symbols, so when the interference between symbols is removed, while the interference between sub-carriers in pilot frequency reference signals is removed. More important, through the pilot frequency signal design method of the invention, the receiving end channel does not need forming blurry function characteristic in estimating process, so, the receiving end avoids the complex calculation in signal processing, and greatly reduces the hardware implementing difficulty and system cost in OFDM / OQAM system. The invention is particularly suitable for the self-adapting OFDM / OQAM system and high-speed OFDM / OQAM system.

Methods and equipment are provided for processing sheet-like substrates. The methods and equipment are useful for depositing coatings on both major surfaces of a sheet-like substrate. Also provided are substrates with coatings on both major surfaces. Preferably, the coatings on the opposed major surfaces of a substrate have different structures, yet share a common structural sequence of at least two film regions, and in some embodiments at least three film regions.

The invention belongs to plant breeding field, especially the biology engineering breeding to improve the quality of soybean and earthnut. It uses PCR method to clone the specific gene section from the gene of soybean and earthnut. According to gene silence principle, the gene section would be rebuilt into reverse repeating sequence structure, which would be built into the carrier that of promoter and terminator of the specific expression. The gene would be transferred, cultivated, and filtered by farm bacilli induce transformation. The invention could improve the quality of the soybean and the earthnut.