Title :
Effects of Group Delay on the Performance of OFDM System
Author :
Gao, Chunyan ; Cao, Xiuying
Author_Institution :
Nat. Mobile Commun. Res. Lab., Southeast Univ., Nanjing, China
Abstract :
In OFDM transmission schemes, orthogonality of the sub-carriers is essential for correct demodulation. However, the non-constant group delay induced by RF cables, amplifiers, and mixers destroys the orthogonality of the sub-carriers and causes a large bit error rate (BER). In this paper, we focus on the effects of group delay on OFDM signals and then simulate the BER degradation, caused by different type of group delay (linear and parabolic), for OFDM signals using QPSK and 16QAM modulation.
Keywords :
OFDM modulation; amplifiers; delays; demodulation; error statistics; mixers (circuits); quadrature amplitude modulation; quadrature phase shift keying; 16QAM modulation; BER; OFDM transmission; QPSK; RF cables; amplifiers; bit error rate; correct demodulation; group delay; mixers; sub-carrier orthogonality; Bit error rate; Cables; Degradation; Delay effects; Delay lines; Demodulation; OFDM; Quadrature phase shift keying; Radio frequency; Radiofrequency amplifiers;
Conference_Titel :
Information Science and Engineering (ICISE), 2009 1st International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-4909-5
DOI :
10.1109/ICISE.2009.532
