5 results about "Gmsk modulation" patented technology

The invention discloses a detection and recognition integrated waveform design method, device and equipment, a medium and a product. The method comprises the following steps: dividing the time length of a waveform according to a time element, a time frame and a time slot structure; for each time slot, a time slot waveform frame structure is set to be composed of a jitter segment, a synchronization segment and a data segment, and the data segment comprises a Gaussian minimum shift keying (GMSK) modulation data segment and a linear frequency modulation (LFM) modulation data segment; respectively setting a GMSK modulation signal parameter and an LFM modulation signal parameter according to communication system demand information; performing pseudo-random hopping design on the pulse frequencies of the synchronization segment and the GMSK modulation data segment to obtain a pseudo-random frequency hopping pattern; and generating a GMSK modulation section waveform and an LFM modulation section waveform according to the GMSK modulation signal parameter and the LFM modulation signal parameter so as to form an integrated waveform. According to the embodiment of the invention, the integrated waveform can realize communication, detection and identification functions at the same time, the waveform resource utilization rate is high, and the anti-interference capability is relatively high.

The invention discloses an interference technical scheme based on GMSK signal characteristics, and relates to the technical field of wireless communication interference. According to the scheme, firstly, differential coding is carried out on a binary random code to obtain a relative code, then a GMSK baseband signal is generated through GMSK modulation, and carrier modulation is carried out; the method is characterized in that a self-adaptive phase modulation forwarding interference signal generation mechanism is designed based on the characteristics of constant envelope and continuous phase change of GMSK signals, and interference signals are generated by constructing a time-varying amplitude disturbance model, a dynamic time delay model and an interference phase model; and finally, superposing the interference signal with the GMSK signal passing through the Gaussian white noise channel to realize effective interference on the GMSK communication signal. According to the method, the GMSK signal characteristics are fully utilized, the interference pertinence is high, the interference effect on a GMSK communication system can be remarkably improved, the interference parameters can be flexibly adjusted according to actual scenes, and the applicability is wide.

The invention discloses a space-frequency joint anti-interference signal sending method suitable for a TDMA network, and relates to the technical field of ad hoc network transmission and wireless communication. According to the method, a transmission time slot format in the TDMA network is specified, and each time slot comprises a synchronous frequency hopping pulse and a data frequency hopping pulse. The method comprises the following steps: firstly, performing data framing according to network time slot control information, performing scrambling, channel coding, channel interleaving and data blocking on information source data, inserting synchronous pulse data, and then performing GMSK modulation; generating frequency hopping pulses from the modulated data according to the frequency hopping pulse control information, and generating time slot frames according to the time slot control information; and finally, a radio frequency signal is generated after DA conversion, and the radio frequency generates a frequency hopping signal according to the frequency hopping frequency control information and is finally sent out through an antenna. According to the method, an anti-interference transmission method is designed by combining spatial domain and frequency domain two-dimensional information in a directional network, reliable and stable transmission of signals can be ensured, and the anti-interference transmission requirement of node information in a TDMA (Time Division Multiple Access) network can be met.

The invention belongs to the technical field of electric power information communication, and discloses a cross-mode remote communication integrated networking adaptive method and a related device. The cross-mode remote communication integrated networking adaptive method comprises the following steps: dividing a channel access mode of an electric power professional data transmission terminal into a control channel access mode and a service channel access mode; a control channel fixedly uses a GMSK modulation and demodulation mode; and the service channel is dynamically switched into one of three modulation and demodulation modes of GMSK, 8PSK and 16QAM according to the indication condition of a keyword in the downlink control signaling of the control channel, and the three modulation and demodulation modes correspond to 25K, 50K and 100K data bandwidths in sequence respectively. According to the technical scheme of the invention, a mode of automatically switching the data bandwidth is provided by considering the difference between the data volume of the control channel and the data volume of the service channel, so that the transmission requirements of larger data services can be met, the utilization efficiency of the 230M frequency band bandwidth can be greatly improved, and the waste of frequency resources is reduced.