OFDM challanges Synchronization requirements are much more strict : – Requires more complex algorithms for time / frequency synch Peak-to-average power ratio – Large signal peaks require higher power amplifiers – Amplifier cost grows nonlinearly with required power
Why Incremental Pilots? Some channels (e.g. where there is more frequency selective fading), increased number of pilots will help. More pilots -Interpolation error small -> Better channel estimation -> Better BER
Channel encoder 010010001 Data sub- carriers Pilot subcarrie rs IFFT CP S/ P 16- QA M Pilot PN Sequence BPSK P/ S DAC Transmitter with channel encoder
Incremental pilots trade-off Better CE Better BER Less redundancy: Worse BER Less redundancy: Worse BER Loss in redundancy acceptable
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