Performance analysis of Adaptive Bit-interleaved Coded Modulation in OFDM using Zero Padding Scheme

OFDM forms the basis for all the 4G wireless technologies which ensures multi carrier modulation. Fading nature of a wireless channel due to constructive/destructive interference degrades the performance of the system. The spectral efficiency and performance gain can be improved by adapting data rate/modulation schemes. We introduce Adaptive Bit-interleaved coded modulation (ABICM) in OFDM using zero padding schemes (ZPS). The paper deal with ABICM-OFDM-ZPS using the expurgated bound provides accurate BER estimates for static fading channels such as indoor wireless systems. Simulation result shows that the proposed ABICM-OFDM-ZPS scheme exhibits better performance gain with reasonable complexity.