Precoded IM-OFDM-SS for Underwater Acoustic Communication

Table 2

Experimental shallow water results.

No.	OFDM	IM-OFDM-SS Walsh	IM-OFDM-SS ZC	Proposed DCT Walsh	Proposed DCT ZC	Proposed DHT Walsh	Proposed DHT ZC
1	0.042	0.043	0.042	0.015	0.014	0.021	0.009
2	0.031	0.022	0.026	0.0083	0.0072	0.007	0.008
3	0.061	0.046	0.040	0.0091	0.0098	0.0084	0.0072
4	0.008	0.006	0.01	0.002	0.003	0.001	0.001
5	0.0096	0.0090	0.006	0.0079	0.0068	0.008	0.0085
Average	0.0303	0.0252	0.0248	0.0085	0.0082	0.0076	0.0067