Based On The Stel-2000a Digital Spread Spectrum Transceiver System Design And Realization

It is well known that spread-spectrum (SS) communication techniques is a kind of wireless communication one, which offer several desirable performance characteristics such as immunity to jamming and interference, low probability of interception, code division multiple access, and multi-path protection. Because of these features, spread-spectrum techniques have been widely used in military applications. Nowadays, commercially available spread-spectrum transceivers primarily use discrete analog technology, which has some shortcomings such as large quantity of devices, affected easily, and less reliable performance. In this paper, a spread-spectrum transceiver system that employed a single-chip all-digital PSK direct sequence spread-spectrum IF transceiver ASIC?STEL-2000A is presented. This system consists of STEL-2000A, and some simple peripheral circuits, which is setup simply and dexterously, more reliable, and need less devices. Baseband and intermediate frequency (IF) processing including its software and hardware circuit design, implements and debugging are finished in this paper. Experiments prove that this system can function correctly.The main work of this paper is summarized as follows:1) Discuss systematically the principle of a PSK direct sequence despread-spectrum scheme based on the digital matched filter (DMF). Also, performance analysis of DMF for PN code acquisition and tracking is given.2) Discuss the choice of the proper IF in the STEL-2000ADS ?SS transceiver.3) Introduce thoroughly the performance, characteristics of STEL-2000A and setup method of its control registers in the real communication system. Finish software and hardware design, implement and debugging of a spread-spectrum transceiver system by the requirement of the project.