30 results about "Space shift keying" patented technology

The character input keyboard. One shift key and one space key are placed on the home position of the left and right thumb, and one control key is placed between them. These keys have the width from 1 to 1.5 times of the character key.

The invention relates to a central cycle weight generalized space shift keying modulation device, which is characterized in that it comprises: a serial-to-parallel conversion module; an active antenna group mapping module; a center cycle weight space shift keying symbol generation module; and a transmission vector synthesis module. Another technical solution of the present invention is to provide a central cycle weight generalized space shift keying modulation method. The invention has high reliability and good spectrum efficiency, and can flexibly activate any antenna, and is applicable to vehicle-road communication or vehicle-vehicle communication scenarios in the Internet of Vehicles to improve the communication quality of unbalanced links between receiving and transmitting antennas.

A space-shift keying method based on a time-space matrix constellation diagram includes that an emitter of a communication system establishes a time-space matrix constellation diagram off-line, the emitter of the communication system finds out the position of an emission antenna in the time-space matrix and establishes the time-space matrix constellation diagram by determining the sending value of the position, and the information bits input by the emitter are divided into groups according to the constructed time-space matrix constellation diagram. The information bits in each group are mapped to one time-space matrix in the time-space matrix constellation diagram for signal emission. The reception apparatus of the communication system employs maximum-likelihood demodulation, and receives signals sent by the emitter. The space-shift keying system obtains emission diversity gain, and the performance of the system is improved. The limitation that the number of the emission antennas of a conventional space-shift keying system has to be the power of 2 is overcome, and the design flexibility of the system is improved. The transmission characteristics of a single chain of the conventional space-shift keying system are retained, and the complexity of a multi-antenna system is reduced.

Provided is an overloaded keypad layout which is efficient, ergonomic, unambiguous, intuitive to operate, and also familiar to the average user in its letter arrangement. More particularly, the overloaded keypad layout comprises four rows, and a space-key is positioned in the third row from bottom, and is QWERTY-like its letter arrangement. Further, the multitap input method or selector (select-the-next-letter key) input method may be employed to disambiguate the overloaded keypad layout.

The invention discloses a generalized space-time-shift keying modulation method based on a unit matrix loop structure. Information transmission is carried out by spatial modulation (SM) and space shift keying (SSK) by means of spatial dimensions, and extra frequency spectrum efficiency can be obtained compared with a traditional MIMO scheme. According to the modulation method, a unit matrix moves in a loop mode inside a scattering matrix, and no auxiliary computer search needs to be carried out on the scattering matrix; the GSTSK-CI method is applicable to any MIMO system with the number of transmitting antennas larger than 2, and transmit diversity can be obtained except for two special conditions; meanwhile, the GSTSK-CI method has the lower decoding complexity compared with a traditional GSTSK scheme, and has higher spectral efficiency compared with an SM-OSTB scheme on the condition that the numbers of transmitting antennas are the same; the simulation result verifies theoretical analysis and indicates that the GSTSK-CI method is better than the GSTSK scheme and the SM-OSTBC scheme.

The invention discloses a multi-stream air-shift keying modulation and demodulation method in a multi-input multi-output system, belonging to the technical field of wireless communication. The modulation method of the present invention is as follows: the data to be sent is divided into multiple streams for SSK modulation, each stream is distinguished by a different fixed modulation signal, the modulated multi-stream data is sequentially superimposed, and the specific modulation symbol selection criteria and superimposition Algorithm, so that there will be no collision of transmission signals after the multi-stream information is superimposed, so that each stream of data can carry the transmission data of log2Nt bits, where Nt is the number of transmitting antennas. The invention also discloses a demodulation method suitable for the above modulation method. The modulation method of the present invention greatly improves the spectral efficiency of the SSK system by adding multiple transmission streams without changing the antenna configuration of the SSK system, and under the same spectral efficiency, it can obtain a higher frequency than the traditional VBLAST system and the enhanced VBLAST system. SSK system has a lower bit error rate.

The invention relates to the field of wireless communications, and discloses a binary digital signal space shift keying modulation and demodulation method for a multi-input multi-output system. The multi-input multi-output system comprises Nt transmitting antennas and Nr receiving antennas. The input data is divided into K data streams to carry out SSK (Space Shift Keying) modulation; according to the transmitting antennas corresponding to the original mapping serial number from n1, n2 to nK of the K data streams on the Nt transmitting antennas, K modulation symbols are respectively mapped to the different transmitting antennas and transmitted. The invention further provides a corresponding demodulation method. The modulation and demodulation method can greatly improve the spectrum efficiency of the SSK technology, and under the same frequency efficiency, can achieve lower error rate performance than the traditional VBLAST (Vertical Bell Layered Space Time) system.

The invention discloses a space-shift keying method of step-by-step coding, wherein the transmitting end uses step-by-step multi-step coding of information bits, thereby making full use of the space degree of freedom of the multi-input multi-output system and improving the transmission rate of the system. In the step-by-step multi-step encoding scheme proposed by the present invention, different information bits are mapped in each step of the encoding process, and finally the final order vector to be encoded is formed. The receiving end can adopt the maximum likelihood detection algorithm, and the present invention also proposes a detection scheme based on orthogonal triangular decomposition. Compared with the traditional space domain modulation scheme, the progressive coding space shift keying scheme proposed by the present invention can obtain higher transmission rate and better bit error rate performance.

The invention discloses a method for detecting data at the receiving end of an air shift keying transmission system based on layered detection, comprising the following steps: the first step, establishing the receiving end model; the second step, simplifying the receiving end model; the third step, The transmitted data is demodulated through a layered detection algorithm. The data detection method of the receiving end of the space shift keying transmission system based on layered detection of the present invention, its bit error (BER) performance gradually approaches the optimal detection algorithm (ML) with the increase of the search radius, when the search radius is the transmitting end antenna When the number, the detection algorithm of the present invention is equivalent to the maximum likelihood detection algorithm. The algorithm calculates and sorts each layer so that the bit error rate performance close to the optimal detection algorithm can be obtained under a small search radius, so the present invention can greatly reduce the complexity of the algorithm at the receiving end while obtaining better performance Spend.

The present invention is applicable to the technical field of text input. Provided are a text sorting method and apparatus, a terminal device, and a medium. The text sorting method comprises: generating, according to a character input by an inputter, a text sequence matching the character; acquiring a previous input word corresponding to the character, and respectively combining the word with each group of text in the text sequence; determining, according to a pre-stored number of search results, the number of search results of each group of text combinations after the combination; carrying out a first instance of sorting on each group of text in the text sequence according to the number of search results; and acquiring a personal attribute of the inputter and a character attribute of the character, and carrying out a second instance of sorting on each group of text, subjected to the first instance of sorting, in the text sequence, so that the sorted text is more in line with requirements of the inputter, wherein the inputter can directly input text by means of pressing the space key, thereby shortening the text input time and improving the text input efficiency. The present invention is applicable to practical application.

The invention relates to a compressed-sensing-based signal detection method for a GSSK (generalized space shift keying) modulation communication system and belongs to the technical field of wireless communications. Compressed sensing technology is used with maximum likelihood detection; a confidence interval T' of an activated antenna position in a transmitting antenna array in the GSSK modulation communication system is obtained by the compressed sensing technology; ML (maximum likelihood) detection is performed in the confidence interval T'. Compared with overall search in ML detection, the method has the advantages that search space for ML detection is narrowed greatly so that computing complexity is reduced greatly; during the process of determining the confidence interval T' by the compressed sensing technology, detection precision is the same as that in ML detection by setting proper k constants.

The invention provides a modular frame. The modular frame comprises a key area. The key area is provided with a function key hole group, a letter key hole group, a number key hole group, a shift key hole, a space key hole, a backspace key hole and an enter key hole. The shift key hole is located at one side of the letter key hole group and is provided with a first processing area. The space key hole is arranged at a bottom end of the key area and is provided with a second processing area, a third processing area and a fourth processing area. The backspace key hole is provided with a fifth machining area. The enter key hole is located below the backspace key hole and provided with a sixth machining area and a seventh machining area. The first processing area to the seventh processing area can selectively execute the processing technology so as to configure the modular frame into a first specification, a second specification or a third specification.

The invention discloses an automatic space key assembling system. The automatic space key assembling system comprises a rack, and further comprises a space key lining feeding device, a four-axis mechanical arm, a CCD detecting device, a station rotating platform device, a roller press discharging device, a receiving device and a PLC which are arranged on the rack. By means of the above manner, theautomatic space key assembling system is characterized in that a tray feeding manner is adopted for automatic feeding, the mechanical arm is used for taking a material, CCD automatic detection is carried out, qualified space key linings are placed into key caps on positioning jigs, the linings and the key caps enter a roller press station to be subject to roller press after move loading and overturning, and pressed space keys are placed into the receiving device through the discharging device; in addition, the positioning jigs in multiple models are arranged in equipment, the procedure is orderly switched when model changing is needed without replacement of the jigs, and the model changing time is shortened; and meanwhile, errors generated by manual participation are reduced, the production efficiency is improved, and the advantages of being high in reliability, accurate in positioning, compact in structure, high in transposition speed, small in noise and the like are achieved.