Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: On transmission performance of OFDM-based schemes using MMSE-FDE in a frequencyselective fading channel | Gacanin and Adachi EURASIP Journal on Wireless Communications and Networking 2011 2011 193 http content 2011 1 193 EURASIP Journal on Wireless Communications and Networking a springeropen Journal RESEARCH Open Access On transmission performance of OFDM-based schemes using MMSE-FDE in a frequency-selective fading channel Haris Gacanin1 and Fumiyuki Adachi2 Abstract There has been greatly increasing interest in orthogonal frequency division multiplexing OFDM for broadband wireless transmission due to its robustness against multipath fading. However OFDM signals have high peak-to-average power ratio PAPR and thus a power amplifier must be operated with a large input power backoff IBO . Recently OFDM combined with time division multiplexing OFDM TDM using minimum mean square errorfrequency domain equalization MMSE-FDE has been presented to reduce the PAPR while improving the bit error rate BER performance of conventional OFDM. In this article by extensive computer simulation we present a comprehensive performance comparison of OFDM-based schemes in a nonlinear and frequency-selective fading channel. We discuss about the transmission performance of OFDM-based schemes with respect to the transmit peak-power the achievable capacity the BER performance and the signal bandwidth. Our results show that OFDM TDM using MMSE-FDE achieves a lower peak-power and capacity than conventional OFDM which means significant reduction of amplifier transmit-power backoff but with a slight decrease in signal bandwidth occupancy. Keywords OFDM TDM OFDM capacity power spectrum density bit error rate amplifier power efficiency I. Introduction In a wireless channel a signal propagates over a number of different paths that give rise to a frequency-selective fading which produce severe inter-symbol interference ISI and degrades the transmission performance 1 . To solve this problem intensive research effort on frequency domain channel equalization FDE is currently ongoing
