Blind-detection assisted sub-band adaptive turbo-coded OFDM schemes

摘要

Burst-by-burst adaptive OFDM modems efficiently combat the effects of strong time-variant multipath interference. Their performance is investigated using blind modem mode detection and turbo coding. Virtually error-free modem mode detection isachieved over Gaussian channels for Signal-to-Noise Ratios (SNR) in excess of about 10dB upon using one of four modem modes, namely 0, 1, 2 and 4 bits / symbol in each of the sub-bands employed. The system can be configured for maintaining arbitrarytarget BERs, including virtually error-free communications, when adjusting the target number of bits per OFDM symbol transmitted.