Research Article
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 |
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