Abstract: A spatial position-dependent I/Q domain modulation method, dual domain modulation method and multiple access communication method are provided. The methods eliminate the dependence of physical layer secure communication on channel state information, and realize the function that a receiver at an expected position can communicate normally, while an eavesdropper at other positions cannot receive a signal or can only receive a wrong signal. The security capability of a wireless communication system is improved from the spatial dimension. The multiple access communication method can realize the distinguishing of multiple users according to precise spatial position points. Even if a plurality of users are located in the same sector in an angular domain, as long as the spatial positions of these users are different, the method can be used to perform multiple access communication, thereby further improving the spatial multiplexing rate of the system and increasing the system capacity.

Abstract: A high-dimensional non-orthogonal transmission method is provided. In the method, signals of various users are mapped to form high-dimensional signals, and the high-dimensional signals are pre-coded, such that non-orthogonal transmission is realized in a higher dimension. Moreover, different users perform matched receiving on respective signals, and non-orthogonal transmission signals can be recovered merely by means of a receiver with a linear complexity. By means of the method, multi-user data non-orthogonal transmission can be realized without depending on conditions such as user pairing and collaboration, and various users do not need to perform iterative feedback, such that the detection complexity of non-orthogonal multi-user signals is significantly reduced.

Abstract: A high-dimensional signal transmission method is provided. The method generates M M-dimensional first signals on the basis of M original signals and generates M M-dimensional second signals on the basis of a precoding signal and of the first signals, and finally, a transmitter sums all of the second signals and then transmits by utilizing M subchannels. As such, each subchannel carries information of the M original signals; hence, when any subchannel experiences deep fading, the deep fading is shared jointly by M signals, thus preventing the deep fading from causing a particularly severe impact on any signal. Moreover, all of the original signals can be recovered by utilizing the signals on the other subchannels, thus increasing the systematic resistance against subchannel deep fading. Meanwhile, the system implements the parallel transmission of the M original signals, thus ensuring the throughput of a communication system.

Abstract: A phase domain modulation method dependent on a spatial position is provided. The method mainly includes the following steps: a transmitter and a receiver perform time synchronization to obtain a synchronization time; the transmitter performs a phase domain precoding operation on an original signal to obtain a phase domain pre-coded signal; the receiver receives the phase domain pre-coded signal, obtains a phase domain initial reception signal, and performs a phase domain matching operation on the phase domain initial reception signal to obtain an estimation of the original signal.

Abstract: Disclosed herein are compositions for detecting the presence of one or more target(s) of interest, wherein the composition comprises a first hairpin initiator molecule and a second initiator molecule. Also disclosed herein are methods of using the same.

Abstract: An unmanned aerial vehicle (UAV)-based intelligent anomaly identification method for petroleum pipeline inspection is provided. The precise UAV cruise technology is combined with a target detection algorithm to design an intelligent petroleum pipeline inspection method, which realizes fast anomaly detection for petroleum pipeline inspection based on the existing computer processing capability. In addition, a lot of optimization algorithms and improvements are made for target detection under special working conditions of UAV inspection, and a dedicated target detection network model adapted to these conditions is trained. The UAV-based intelligent anomaly identification method realizes accurate, real-time anomaly reporting for petroleum pipeline inspection, reduces the blindness of manual inspection, greatly improves inspection efficiency, reduces labor costs, and has practicability.

Abstract: The present invention provides a chitooligosaccharide-N-geraniol derivative and a preparation method and application thereof. The degree of substitution of a chitooligosaccharide-N-geraniol derivative is from 0.26 to 0.283. The method includes dissolving oligosaccharide in dimethyl sulfoxide, dissolving geranyl bromide in dimethylformamide, and then mixing, performing a water bath reaction and adding acetone in after the water bath reaction, performing a centrifugation and collecting precipitates, performing Soxhlet extraction and vacuum drying to obtain the chitooligosaccharide-N-geraniol derivative. The present invention has the advantages of easy preparation method, low cost, simple purification method and stable properties. The chitooligosaccharide derivative has good water solubility, antibacterial activity against Staphylococcus aureus, Escherichia coli and other bacteria, and has good application prospect in the fields of medicine, food, cosmetics, agriculture, etc.

Abstract: Methods, systems and nanoprobes for identifying sequence-specific transcription factor DNA interactions for drug and/or disease screening are provided. The method includes homogeneously mixing plasmonic metal nanoparticle probes with protein samples as an assay in multi-well plates. The plasmonic metal nanoparticle probes comprise a plurality of plasmonic metal nanoparticles and a specific DNA response element and the protein samples bind with the specific response elements to form an assembly of the plasmonic metal nanoparticle probes. The method further includes measuring particle size distribution of the assembly of the plasmonic metal nanoparticle probes in the solution by dynamic light scattering and determining one or more sequence-specific transcription factor DNA interactions from a curve of the particle size distribution determined from light scattered by the dynamic light scattering. The nanoprobe includes a plurality of plasmonic metal nanoparticles and a DNA linker.

Abstract: A system and method suppresses the interference caused by non-orthogonal signals on multiple channels of the same receiver by applying an inverse of the correlation among the non-orthogonal signals to the decoded signals. In a multi-channel receiver, the receiver is aware of the codes that are allocated to each of the channels, and thus, can be configured to determine the correlation among the multiple codes that are allocated to a receiver. The inverse of this correlation is applied to the output of the correlators assigned to each code, thereby suppressing the effects of using non-orthogonal codes for transmissions to the same receiver. If different sized codes are allocated to the same receiver, the correlation of the shorter code and a corresponding segment of the longer code is computed. The inverse of the correlation for the segment is applied to the output of the correlators, corresponding in time to the processing of the shorter code and this segment of the longer code.

Abstract: A system and method suppresses the interference caused by non-orthogonal signals on multiple channels of the same receiver by applying an inverse of the correlation among the non-orthogonal signals to the decoded signals. In a multi-channel receiver, the receiver is aware of the codes that are allocated to each of the channels, and thus, can be configured to determine the correlation among the multiple codes that are allocated to a receiver. The inverse of this correlation is applied to the output of the correlators assigned to each code, thereby suppressing the effects of using non-orthogonal codes for transmissions to the same receiver. If different sized codes are allocated to the same receiver, the correlation of the shorter code and a corresponding segment of the longer code is computed. The inverse of the correlation for the segment is applied to the output of the correlators, corresponding in time to the processing of the shorter code and this segment of the longer code.

Abstract: A system and method suppresses the interference caused by non-orthogonal signals on multiple channels of the same receiver by applying an inverse of the correlation among the non-orthogonal signals to the decoded signals. In a multi-channel receiver, the receiver is aware of the codes that are allocated to each of the channels, and thus, can be configured to determine the correlation among the multiple codes that are allocated to a receiver. The inverse of this correlation is applied to the output of the correlators assigned to each code, thereby suppressing the effects of using non-orthogonal codes for transmissions to the same receiver. If different sized codes are allocated to the same receiver, the correlation of the shorter code and a corresponding segment of the longer code is computed. The inverse of the correlation for the segment is applied to the output of the correlators, corresponding in time to the processing of the shorter code and this segment of the longer code.

Abstract: Reliable decoding of quick paging channel is provided using first and second page indicators carried in a quick paging channel of a wireless communication system. First and second threshold values are established to determine whether the first and the second page indicators each, as received from a base station to a mobile station, is highly reliable, reasonably reliable, or unreliable. Preferably, the pilot strengths for the first and the second page indicators each is compared with the first and the second page indicators. Depending on the level of reliability of the first and the second page indicators, different actions are taken to determine whether the mobile station enters a sleep mode or decodes a next paging channel slot.

Abstract: A system and method is provided that searches for the frequency and phase of a CDMA transmission in an iterative manner. With its automatic frequency control (AFC) disabled, the receiving system performs a coarse search for the transmitter's CDMA phase at a nominal receiving frequency. When the coarse phase is obtained, the AFC is invoked with a large-range pull-in, to obtain an initial, coarse frequency that is likely to be closer to the transmitter's frequency than the initial nominal frequency. At this coarse frequency, the receiving system repeats its search for the transmitter's CDMA phase, starting at the previously determined coarse phase. Because this second phase determination is conducted in the presence of less frequency error, it provides for a more accurate phase determination. The AFC is again invoked, but with a small-range pull-in, to obtain a finer frequency determination.

Abstract: In a method of discriminating a received spread spectrum signal among a number of received spread spectrum signals that are transmitted over a transmission channel, the received spread spectrum signal is despread, thereby using a locally generated pseudo noise sequence with a given phase offset. The despread received spread spectrum signal is quantized so as to obtain a probability mass function estimate of the despread received spread spectrum signal. A difference is determined between the probability mass function estimate and a true probability mass function that corresponds to a transmitted spread spectrum signal before transmission over the transmission channel. The difference is accumulated over a given number of symbols so as to obtain a statistic of the received spread spectrum signal. If the statistic fails a test against a given threshold, the received spread spectrum signal is rejected. Otherwise, the statistic is accepted.

Abstract: A remote access device is configured to communicate with each Bluetooth device within a locale. When communication is desired between two Bluetooth devices within this locale, the remote access device allows the user to send commands and other information from the remote access device to each Bluetooth device to effect the initialization of the communication channel between the two devices. Using the remote access device, the user can make selections on each Bluetooth device, enter PINs as required, respond to confirmation requests, and the like. Because each Bluetooth device may be distant from the remote access device and distant from each other, the use of the remote access device allows a user to enable communications between the Bluetooth devices without traveling back and forth between physically separated Bluetooth devices.

Abstract: A frame error rate of received frames is estimated. Received frames are error correction decoded. It is determined whether an error correction decoded frame is a good frame. A decoded good frame is error correction encoded. The frame error rate is estimated on the basis of the error corrected good frame and a received frame.

Abstract: A system and method is provided that searches for the frequency and phase of a CDMA transmission in an iterative manner. With its automatic frequency control (AFC) disabled, the receiving system performs a coarse search for the transmitter's CDMA phase at a nominal receiving frequency. When the coarse phase is obtained, the AFC is invoked with a large-range pull-in, to obtain an initial, coarse frequency that is likely to be closer to the transmitter's frequency than the initial nominal frequency. At this coarse frequency, the receiving system repeats its search for the transmitter's CDMA phase, starting at the previously determined coarse phase. Because this second phase determination is conducted in the presence of less frequency error, it provides for a more accurate phase determination. The AFC is again invoked, but with a small-range pull-in, to obtain a finer frequency determination.

Abstract: Reliable decoding of quick paging channel is provided using first and second page indicators carried in a quick paging channel of a wireless communication system. First and second threshold values are established to determine whether the first and the second page indicators each, as received from a base station to a mobile station, is highly reliable, reasonably reliable, or unreliable. Preferably, the pilot strengths for the first and the second page indicators each is compared with the first and the second page indicators. Depending on the level of reliability of the first and the second page indicators, different actions are taken to determine whether the mobile station enters a sleep mode or decodes a next paging channel slot.