3 results about "Gmsk modulation" patented technology

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.