Title :
A Novel Receiver Design for PAM-DMT in Optical Wireless Communication Systems
Author :
Nan Xiang ; Zaichen Zhang ; Jian Dang ; Liang Wu
Author_Institution :
Nat. Mobile Commun. Res. Lab., Southeast Univ., Nanjing, China
Abstract :
Pulse-amplitude-modulated discrete multitone (PAM-DMT) modulation is an optical orthogonal frequency division multiplexing scheme, which is compatible with intensity modulation and direct detection channel. In the conventional receiver for PAM-DMT, only the imaginary parts of subcarriers are detected, while the real parts are considered as clipping noise and simply discarded, causing insufficient usage of the received power. This letter proposes a new receiver characterizing temporal and spectral diversity combining for PAM-DMT, which extracts the effective information in clipping noise to recover the data. The proposed receiver achieves a better performance than the conventional receiver with a gain of at least 2.3 dB in Eb/N0 at the system bit error rate of 10-5 in additive white Gaussian noise channel by simulation when using 4-PAM modulation.
Keywords :
AWGN channels; OFDM modulation; error statistics; optical design techniques; optical modulation; optical noise; optical receivers; pulse amplitude modulation; 4-PAM modulation; PAM-DMT; additive white Gaussian noise channel; clipping noise; optical orthogonal frequency division multiplexing scheme; optical wireless communication systems; pulse-amplitude-modulated discrete multitone modulation; receiver design; spectral diversity; subcarrier detection; system bit error rate; temporal diversity; Bit error rate; Diversity reception; Noise; OFDM; Optical receivers; Optical transmitters; Optical wireless communication (OWC); intensity modulation and direct detection (IM/DD); pulse-amplitude modulated discrete multitone (PAM-DMT); pulse-amplitude-modulated discrete multitone (PAM-DMT);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2445793