Precoded IM-OFDM-SS for Underwater Acoustic Communication

Figure 7

Received signal: (a) DCT-IM-OFDM-SS Walsh; (b) DCT-IM-OFDM-SS ZC; (c) DHT-IM-OFDM-SS Walsh; (d) DHT-IM-OFDM-SS ZC.

(a)

(b)

(c)

(d)