摘要
本文通过对80 2 .16aOFDM系统信道的分析,权衡估计的性能和算法复杂度两个因素,针对不同的传输环境,提出了动态的OFDM信道估计方案.另外我们找到了一组优秀的非正则LDPC码,将其应用于IEEE 80 2 16aOFDM环境中,仿真验证了它们在SUI 3和SUI 5多径衰落信道环境下具有良好的性能,并和协议中提出的卷积Turbo码进行了比较,结果证明在相同条件下,本文的LDPC码可以取得比协议提出的卷积Turbo码更优越的性能,具有更好的抗多径衰落的能力.
Proposing a dynamic scheme of channel estimation for 802.16a OFDM system with the trade off between estimation performance and arithmetic complexity. In addition, we find a set of excellent irregular LDPC codes and examine the performance of them in multipath fading channel. Simulation shows that these codes have nice performance in SUI-3 and SUI-5 fading channels. Furthermore, under the multipath environments, the performance of LDPC codes is superior to that of the convolution turbo codes which is proposed by IEEE 802.16a standard.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2005年第4期624-628,共5页
Acta Electronica Sinica
基金
国家高科技"863"计划(No2002AA123046)
关键词
OFDM
LDPC码
信道估计
TURBO码
Bit error rate
Computational complexity
Computer simulation
Convolutional codes
Dynamics
Estimation
Orthogonal frequency division multiplexing
Turbo codes
