| | 111 | By disabling time-domain CFO correction, we have increased the burden on the phase error recovery system. In effect, the residual CFO to be corrected is now considerably larger. This can be observed in the "Phase Error Estimates" plot in the first figure above. The number of 2π wraps is considerably larger than the previous scenario where time-domain CFO correction was enabled. Ultimately, however, phase error recovery can only go so far. By the time the system is applying phase corrections in the frequency domain, ICI has already occurred. This can be observed in the "EVM and SNR" plots where the effective SNR is a couple of dB worse than the previous case. |
| | 112 | |
| | 113 | === CFO Recovery: Disable, Phase Error Recovery: Enabled, SFO Recovery: Enabled === |
| | 114 | |
| | 115 | || [[Image(Cn_PEn_Sy_phaseError.png,width=400)]][[BR]]1. Phase Error Estimates and SFO Recovery Matrix || [[Image(Cn_PEn_Sy_constellations.png,width=400)]] [[BR]]2. Rx Constellation || [[Image(Cn_PEn_Sy_evm.png,width=400)]] [[BR]]3. Error Vector Magnitude (EVM)[[BR]] and effective SNR || |
| | 116 | |
| | 117 | |
