Abstract
Military robot swarm becomes more and more important for contemporary military application. In order to satisfy sophisticated application scenarios, novel communication architecture for military robot swarm has to be conceived. In this paper, we propose a multi-carrier intelligent covert satellite communication (MCICSC) architecture based on electromagnetic environment sensing technology, in where the ability of dynamically adapting the system configuration to the holistic requirements of covertness, performance, and complexity can be considerably improved. Additionally, in order to solve the carrier synchronization problem in very low signal noise ratio (SNR) for each data stream of MCICSC, polar code (PC) is incorporated into the proposed MCICSC system. With the aid of the proposed polar code-aided multi-stream parallel feedback (PAMSPF) carrier synchronization scheme, the MCICSC system is capable of realizing high-precise carrier synchronization even in very low SNR region. Moreover, in order to further decrease the complexity of our MCICSC system, we also propose a polar code-based diversity combining (PBDC) scheme, which is capable of efficiently combing all the data streams without the aid of channel state information (CSI) estimation. Numerical simulations demonstrate that for MCICSC system the performance of the PAMSPF carrier synchronization and PBDC combining schemes can get extremely close to that of an ideally synchronized system. Complexity analysis of the proposed algorithms is given as well.
Highlights
Robot swarm has attracted lots of attentions in the past decades and has achieved rapid development with the aid of Artificial Intelligence [1], [2]
SIMULATION RESULTS Numerous simulation results of the carrier synchronization and diversity combing schemes proposed for our multi-carrier intelligent covert satellite communication (MCICSC) system are demonstrated
We construct polar codes according to the same method in [46], which is applied to all the processing branch (PB) modules
Summary
Robot swarm has attracted lots of attentions in the past decades and has achieved rapid development with the aid of Artificial Intelligence [1], [2]. The traditional ways to realize the communication covertness can be categorized into two classes: physical layer-related methods and application layer-related methods The former commonly relies on the short frame transmission, spread spectrum technology and multiple beam forming technology. In this paper we firstly construct a new covert satellite communication system, which is motivated by multicarrier direct sequence code-division multiple access (MC-DS-CDMA) systems [33]. 2) A polar code-aided multi-stream parallel feedback (PAMSPF) carrier synchronization algorithm is designed to achieve a high-precision and low-complexity carrier synchronization, which paves the solid way for the sequential processes of data stream diversity combination and final information recovery. By simultaneously executing the T-domain and F-domain (namely, TF-domain) spreading, MC-DS-CDMA systems can achieve the processing gain that equals the product of the T-domain and F-domain spreading factors, which is beneficial for increasing the user capacity
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