Performance Analysis of OFDM/16QAM Systems under Frequency Selective Rayleigh Fading with Complex Radio Frequency Interference in Indoor Wireless Channel

摘要

In this paper, the symbol error probability of a OFDM/16QAM system is analyzed according to the composition ratio of complex radio frequency interference in a frequency selective Rayleigh fading channel with Gaussian or impulse noise, and the performance degradation of the OFDM/16QAM system is also analyzed numerically through complex radio frequency interference models. Moreover, a robust concatenated FEC channel coding technique is adopted in order to achieve the reliable QoS in wireless ATM LAN. As a result of analysis, in the channel, if channel delay time is shorter than guard time, the error performance keeps good; otherwise the error performance becomes bad drastically. If the impulse noise (A=0.01, Γ'=0.01) exists in the channel, it is found that the error probability drops as much as 10~(-2) compared with the error probability in a channel with Gaussian noise (A≥1, Γ'≥l). Moreover, among complex radio frequency interference models, impulse noise affects the performance of the OFDM/16QAM system more dominantly than a rectangular wave and sine wave interference. On the other hand, in the channel with complex radio frequency interference, the OFDM/16QAM system adopting the cancatenated FEC coding has more 3 dB performance gain than the system adopting the convolutional coding in terms of CNR.