Adaptive modulation scheme based on low-density parity-check coding

作者：Yin Liuguo^*; Chen Weigang; Lu Jianhua; Wu Youshou

来源：Journal of Tsinghua University(Science and Technology), 2004, 44(6): 833-836.

• Adaptive modulation
• Channel estimation
• Low density parity check coding
• Nakagami fading channels

An adaptive modulation scheme was developed based on low-density parity-check (LDPC) coding to eliminate the transmission performance degradation caused by time-variant fading interference in wireless channels. The scheme employed an LDPC code to encode all subchannel transmitted bits, with every subchannel dynamically selecting its modulation scheme according to its instantaneous channel bit-error-rate estimated from the bit sequences before and after the LDPC decoding. Simulation results show that, over Nakagami-fading channels, the proposed transmission scheme is well adapted to time-variant wireless channels, achieving an optimal information transmission rate with very low system complexity, with substantial improvements in the bit-error-rate. Specifically, the scheme achieved a transmission rate within 3 dB of the theoretical limit.

• 出版日期2004
• 单位清华大学