8.4 Spread spectrum communication systems Scramle 8.4.1 DSSS systems √Hide block diagram of a DSSS system is, Anti-lnt U m(v0u① r(t) 8(T-t) r20 0 t=T a. cos 2nft c(t) I(t) c(t) c0s2对ft PSK modulator Channel-→ PSK demodulator What happen in SPECTUM? 5(0 sps(t) ros(t) Despread No BPF with 6(0 5() c(t) ()+J() B c(t) UESTC-Wireless communicatons Prof李晓峰 13