Low Complexity, High Throughput Layered FFT Structure for BI Based COFDM Systems


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Abstract


Broadband wireless mobile communication systems require high speed data rate transmissions through severe multipath propagation channels. An effective multicarrier modulation scheme, Orthogonal Frequency Division Multiplexing (OFDM) has become popular modulation technique for transmission of signals over multipath propagation channels. OFDM has been adopted by leading standards such as HIPERLAN/2, IEEE802.11, IEEE 802.16 and 3GPP long term evolution (LTE). To achieve the need of high speed data rate and high reliability for next generation of wireless mobile communication system, we designed a communications system of bit interleaving OFDM based on low density parity check (LDPC) code. However, the bit interleaved based LDPC coded OFDM system introduce larger complexity by applying discrete Fourier transform (DFT) at the transmitter and inverse DFT (IDFT) at the receiver and severe peak to average power ratio (PAPR). In this paper, we propose the concept of layered FFT structure for BI based LDPC coded OFDM systems which can reduce the problems such as high PAPR, high complexity in user terminals.
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Keywords


CCDF; D&C FFT Algorithm; LDPC; OFDM; PAPR

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