MDPSK-OFDM with highly power-efficient block codes for frequency-selective fading channels

This paper investigates the performance of M-ary differential phase shift keying orthogonal frequency-division multiplexing (MDPSK-OFDM) systems employing peak power controlling block codes over frequency-selective Rayleigh fading channels. The block codes have a capability of both error correction and reduction of the peak-to-average power ratio (PAPR). To decode the block codes with reasonable complexity, the extended version of the ordered statistic decoding of Fossorier and Lin (see IEEE Trans. Inform. Theory, vol.41, p.1379-96, 1995) is utilized. The bit error rate performance of the block codes is evaluated over typical indoor radio channels by computer simulation and compared with that of the equivalent frequency diversity of the repetition codes. The significant coding gain and improvement of the irreducible error floor are observed under the constraint of the PAPR from 3 to 6 dB