Title :
Performance of LDPC Coded AOFDM Under Frequency-Selective Fading Channel
Author :
Mingyu, Zhou ; Lihua, Li ; Na, Wen ; Ping, Zhang
Author_Institution :
Wireless Technol. Innovation Inst., Beijing Univ. of Posts & Telecommun.
Abstract :
In this paper, LDPC code is combined with adaptive OFDM. Code rate of LDPC is fixed and modulation mode of sub-carriers can vary according to CQI. Throughput analysis of the scheme under frequency-selective fading channel and theory of sub-band based LDPC coded AOFDM is given. Computer simulation under 12-tap TU fading channel was carried out. Results show that the LDPC coded AOFDM scheme exhibits BER performance quite close to that with fixed QPSK modulation due to existence of LDPC, meanwhile brings much higher throughput than non-adaptive schemes because of adaptation. The sub-band based adaptation has a little degradation in throughput, but reduces signaling cost greatly. LDPC coded AOFDM guarantees system reliability and improves throughput a lot
Keywords :
OFDM modulation; channel coding; error statistics; fading channels; modulation coding; parity check codes; quadrature phase shift keying; BER performance; LDPC coded AOFDM; QPSK modulation; adaptive orthogonal frequency division multiplexing; bit error rate; computer simulation; frequency-selective fading channel; low-density parity check codes; quadrature phase shift keying; sub-band based adaptation; system reliability; Bit error rate; Computer simulation; Costs; Degradation; Frequency-selective fading channels; Modulation coding; OFDM modulation; Parity check codes; Quadrature phase shift keying; Throughput;
Conference_Titel :
Communications, Circuits and Systems Proceedings, 2006 International Conference on
Conference_Location :
Guilin
Print_ISBN :
0-7803-9584-0
Electronic_ISBN :
0-7803-9585-9
DOI :
10.1109/ICCCAS.2006.284788
