Title :
Dual PN padding TDS-OFDM for underwater acoustic communication
Author :
Jinxing Hao ; Zheng, Y.R. ; Jintao Wang ; Jian Song
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
A time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) scheme with dual Pseudonoise (PN) sequence is proposed for underwater acoustic (UWA) communication. Instead of using cyclic prefix (CP) or zero padding (ZP) as the guard interval, the proposed TDS-OFDM scheme uses two identical PN sequences as guard interval, and utilizes them for frame synchronization and channel estimation. The proposed TDS-OFDM increases the spectrum efficiency over the conventional CP or ZP OFDM systems where additional pilots have to be inserted for channel estimation. With the dual PN at each frame header, compressed sensing channel estimation is adopted and a rather simple equalization design reduces the receiver complexity. With a low-density parity-check (LDPC) code, the proposed system is simulated in doubly selective underwater acoustic channels with long multipath delay spread and severe Doppler spread. The results show that the TDS-OFDM achieves slightly better BER performance and higher spectrum efficiency than the conventional ZP-OFDM.
Keywords :
OFDM modulation; channel estimation; compressed sensing; cyclic codes; error statistics; parity check codes; pseudonoise codes; synchronisation; underwater acoustic communication; Doppler spread; LDPC; TDS-OFDM; bit error rate; channel estimation; compressed sensing; cyclic prefix; doubly selective underwater acoustic channels; dual pseudonoise sequence padding; frame header; frame synchronization; guard interval; low density parity check code; multipath delay spread; receiver complexity; spectrum efficiency; time domain synchronous orthogonal frequency division multiplexing; underwater acoustic communication; zero padding; Channel estimation; Doppler effect; Matching pursuit algorithms; OFDM; Parity check codes; Underwater acoustics; Vectors;
Conference_Titel :
Oceans, 2012
Conference_Location :
Hampton Roads, VA
Print_ISBN :
978-1-4673-0829-8
DOI :
10.1109/OCEANS.2012.6404998