关键词: 扩频, pn码, FPGA

Abstract:

General wireless communication system has many has many shortcomings,for example the poor ability of anti-interference,anti-jamming and anti-multipath performance.This paper proposes a direct sequence spread spectrum system based on FPGA.This design uses 63 bits of code series as spread spectrum modulation code sequences.When sending information code,the information code is modulated by PN code;in the receiver,the information is demodulated.this process improve the system's performance.Both VHDL and principle diagram method are employed to design the circuit in the Altera company Quartus II software.Finally,the circuit is downloaded onto CycloneIII EP3C10E144C8N for debugging,which verifies the feasibility of spread spectrum system.

Key words: spread spectrum;pn code;FPGA