To cope with the challenges of low communication rate and susceptibility to interception of sensing-centric waveforms in integrated sensing and communication （ISAC） systems， this paper designs a multi-channel frequency-hopping transmission architecture based on quadrature phase shift keying （QPSK） and linear frequency modulation （LFM） signals. This architecture transmits multiple LFM signals simultaneously within overlapping spectral bands to enhance the symbol rate. Encrypted communication is achieved by the frequency-hopping characteristics of the LFM subcarriers. Furthermore， the time-division multiplexing （TDM） mechanism of dynamic preambles and data improves the accuracy of path indexing and parameter estimation for multi-path LFM signals. Simulation results show that under identical symbol rate constraints， the proposed multi-channel parallel architecture achieves superior bit error rate （BER） performance compared to traditional single-channel schemes. Specifically， the BER of the four-channel architecture at 0 dB SNR is reduced by one order of magnitude relative to the single-channel scheme. Additionally， the dynamic preamble scheme meets the requirements for path index identification across various scenarios. At 0 dB SNR， the normalized mean square error（NMSE） remains below 10-2. Furthermore， both the proposed symbol demodulation algorithms achieve a BER below 10-2 at 0 dB SNR in their respective scenarios. Moreover， the frequency hopping mechanism significantly enhances the system’s anti-intercept capability. Even with 50% parameter leakage， the probability of accurate recovery （PAR） of signal parameters by the third parties remains suppressed below 7%， validating the robustness and application value of the solution.