# Covert Surveillance Video Transmission with QAM Constellations Modulation
## 4 Experiments and Analysis
However, even in this regime, our proposed method maintains a competitive covertness performance. Furthermore, at \(g_{w}\) = 0.4, our approach showcases superior covertness, indicating a substantial enhancement in performance as the channel gain coefficient decreases. This resilience underscores the effectiveness of our proposed method under diverse channel conditions. In both low- and high-power scenarios, our method consistently outperforms the comparative approach, emphasizing its robust covertness performance under varying operational conditions. This comprehensive analysis reinforces the practical relevance and efficacy of our proposed methodology within the realm of covert communication for surveillance applications. Figure 4: Approximation of our Taylor expansion method. Figure 5: Covertness metric versus transmission power. Figure 4(b) depicts the relationship between the covertness metric and transmission power across varying levels of detection channel noise power. Notably, our proposed method consistently surpasses the comparative backtracking line method in terms of covertness performance. This observed superiority is particularly evident as the detection channel noise power escalates, leading to a substantial enhancement in covertness. With a discerning eye on the dynamics of covertness performance, it becomes apparent that at lower power levels, our proposed method demonstrates notable superiority in maintaining effective concealment. The inherent robustness of our approach is especially pronounced in scenarios characterized by limited power availability. However, it is crucial to note that with an increase in transmission power, there is a discernible deterioration in covertness performance. This phenomenon emphasizes the intricate interplay between transmission power and covertness, highlighting the challenges posed by higher power scenarios. Further insights into the trade-offs and optimal strategies under varying conditions can be gleaned from a nuanced examination of the results. Our findings underscore the effectiveness of the proposed methodology in covert surveillance video transmission, showcasing its resilience in the presence of variations in detection channel noise power levels. The observed trends provide valuable insights for practitioners seeking to optimize covertness performance in real-world surveillance applications. Figure 5(a) provides a visual representation of the dynamic interplay between transmission rate and transmission power for various receiver channel coefficients. The graph prominently illustrates that with an escalation in transmission power, there is a substantial improvement in transmission rate. This observation underscores the pivotal role of power in influencing the efficiency of covert surveillance video transmission. Whether examining scenarios with a receiver channel coefficient of \(g_{b}=0.4\) or \(g_{b}=0.8\), our proposed method consistently outperforms the comparative method, yielding higher transmission rates. This consistency across different channel coefficients reaffirms the robustness and versatility of our approach, making it well suited for a spectrum of operational conditions. Furthermore, as the channel coefficient increases, we observe a notable enhancement in transmission rate. This behavior aligns with the expected trend, indicating that a higher channel coefficient contributes to improved communication efficiency. These results illuminate the positive correlation between transmission power and transmission rate, emphasizing the significance of power optimization strategies in enhancing the efficiency of covert surveillance video communication. The insights gained from this analysis provide valuable guidance for practitioners seeking to optimize transmission rates in covert surveillance video communication systems under varying channel conditions. Figure 5(b) provides a detailed portrayal of the nuanced relationship between transmission rate and transmission power for different receiver noise power levels.