30 results about "Space shift keying" patented technology

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 provides a novel keyboard layout, which resets all the keys in a traditional keyboard layout except letter keys and a space key. The keys on the keyboard, of which the lateral length is longer than the length of a device, are transferred. And one or more lines of keys are added to the longitudinal height of the keyboard to install the keys transferred from the lateral length, and a part of the keys is mergered, a part of the keys are added and a part of the keys are removed as required. Touch bars are arranged at the periphery of the keyboard and can be used for selecting the input options of the input languages in a sliding manner and operating the sliders on the left, the right, the upper and the lower parts of a screen; moreover, two of the touch bars can be operated to realize the functions of enlargement, shrinkage, flexibility, translation and rotation.

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 space shift keying transmission system receiving end data detection method based on layered detection. The method includes the following steps that firstly, a receiving end model is determined; secondly, the receiving end model is simplified; thirdly, sent data are demodulated through a layered detected algorithm. According to the space shift keying transmission system receiving end data detection method based on layered detection, the bit error rate (BER) performance of the method is gradually similar to that of an optimal detection (ML) algorithm along with the increase of the search radius, and when the search radius is equal to the number of antennas at the sending end, the detection algorithm is equivalent to a maximum likelihood detection algorithm. Calculation ranking is conducted on each layer through the algorithm, the bit error rate performance of the method can be similar to that of the optimal detection algorithm in the small search radius, and therefore the method has the advantages that good performance can be acquired, and the complexity of the algorithm at the receiving end is greatly lowered.

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.

The invention relates to a space key for a computer keyboard, which comprises a press key, two X linkage mechanisms, a support plate and an elastic element, wherein the linkage mechanisms are connected between the press key and the support plate and are rigidly connected through two connecting rods for forming an integral linkage mechanism, the connecting rods and two X frame structures 8a simultaneously form an outer connecting rod 8, and the connecting rods and two X frame structures 9a simultaneously form an inner connecting rod 9. Through the mechanism device, the structure is perfectly optimized and is simplified, the stability and the balance performance are improved, and the cost is also greatly saved.

The invention discloses an automatic assembling machine for the space key LINK of a computer keyboard. The automatic assembling machine comprises a rack, and a space key moving mechanism, three sets of LINK sucking and pressing assemblies and a control mechanism are arranged on the upper portion of the rack. The space key moving mechanism is used for driving a space key base body of the computer keyboard to do linear reciprocating motion and supplying the space key base body of the computer keyboard to the three sets of the LINK sucking and pressing assemblies for processing and assembling. The three sets of the LINK sucking and pressing assemblies are all used for pressing space key accessories of the computer keyboard onto the upper part of the space key base body of the computer keyboard. The control mechanism is electrically connected with the space key moving mechanism and the three sets of the LINK sucking and pressing assemblies, and the control mechanism is used for controlling the space key moving mechanism and the three sets of the LINK sucking and pressing assemblies to operate automatically. The automatic assembling machine for the space key LINK of the computer keyboard can replace manual work to complete computer keyboard space key LINK assembling work, the labor intensity of workers can be greatly relieved while the assembling efficiency is improved, and then the assembling machine can increase enterprise benefits.

The invention discloses a design and input method of a multifunctional keyboard. The design and input method comprises the following steps that (1) a functional key zone and the like are arranged according to the layout of the existing computer keyboard; (2) a left figure point rod and a right figure point rod are arranged in a main keyboard zone, the left figure point rod is arranged in the clearance formed by an R key, a D key and an F key, and the right figure point rod is arranged in the clearance formed by an L key, a J key and a K key; (3) a left space key and a right space key are arranged in the main keyboard zone and symmetrically positioned between the two Alt keys side by side; (4) a state indicating lamp is arranged in a state indicating zone; and (5) the left figure point, the right figure point, the left space key and the right space key are combined for use to achieve multiple corresponding input functions. The invention further discloses the multifunctional keyboard. By means of the multifunctional keyboard, a user can conveniently operate a computer without a mouse. A touch pad, a left key and a right key can be removed, so that the keyboard is miniaturized and meets the requirements for small, thin and convenient usage of the existing notebook computer.

The invention discloses an application of a space key. At present, in a windows interface, if an application program is required to be closed, a dialog window comprising the content that the function of the mouse click can be realized by utilizing letter keys 'y' and 'n' is popped up, and most users close the application program by virtue of a mouse, thus the interface is not marked enough and the mouse is frequently used, while the fact that use of the mouse is reduced to the utmost extent is beneficial to human health in the aspect of human engineering. In the invention, the 'space key' is utilized to define and realize 'not' function of the application program.

The invention discloses a differential optical space shift keying modulation system and a modulation method. The system comprises a differential space shift keying modulation module, an LED driving circuit, and an LEDthat are at a transmitting end, , a photoelectric detection circuit,a signal processing circuit and a signal demodulation modulethat are at a receiving end,. A serial data stream firstly passes through the differential space shift keying modulation module to generate a corresponding mapping matrix. Differential operation is achieved by conducting Kronecker product on the mapping matrix at the current moment and the transmission matrix at the previous moment, and the transmission matrix at the current moment is obtained. And the transmission matrix signal of the current symbolperiod is amplified by the driving amplification circuit and then sent by the LED. At a receiving end, a photoelectric conversion circuit and a signal processing circuit are used for converting an optical signal in an atmospheric channel into a processable parallel electric signal, and the processable parallel electric signal is sent to a signal demodulation module in the FPGA. And the demodulation module demodulates the differential signal according to the transmission matrix of the current symbol period and the mapping matrix of the previous symbol period, and finally recovers the original data stream.