An Anti-Interference Coding in UWB-OFDMCommunications  

作　　者：ZHANG Shi-bing CAO Shi-ke ZHANG Li-jun 

机构地区：[1]Nanjing University of Posts and Telecommunications, Nanjing 210003, P.R. China [2]Nantong University, Nantong 226007, P.R. China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2005年第4期32-37,共6页中国邮电高校学报（英文版）

基　　金：This workissupported by National"863"High Technology Research Programof China (2005AA123320) ;Universities Natural Science Research Pro-ject of Jiangsu Province (05KJB510101) .

摘　　要：An anti-interference orthogonal coding is introduced based on Hadamard code and Orthogonal Frequency-Division Multiplexing （OFDM）, in which all sub-channels of Ultra-WideBand （UWB） system are divided into M sub-bands and the power of the every transmitted symbol spreads over each of the sub-bands rather than one sub-band. The complete mathematical analytical relation between encoding and decoding is present and the robustness of the system to interference is examined. When some sub-channels are affected by interference or jamming, the system could regenerate the symbol from others. Simulation results show that the Anti-Interference UWB-OFDM （AI-OFDM） system has evident advantages over conventional UWB-OFDM systems as well as the Interference Suppressing UWB-OFDM （IS-OFDM） in Bit Error Rate （BER） thanks to its robustness to interference. In the case of bad interference, the AI-OFDM system could work up to snuff without any anti-interference step, but the conventional UWB-OFDM system couldn＇t. Compared with the ISOFDM system, the AI-OFDM system improves the performance about 5 dB in Signal-to-Interference Ratio （SIR） and the order of 1-2 in BER.An anti-interference orthogonal coding is introduced based on Hadamard code and Orthogonal Frequency-Division Multiplexing （OFDM）, in which all sub-channels of Ultra-WideBand （UWB） system are divided into M sub-bands and the power of the every transmitted symbol spreads over each of the sub-bands rather than one sub-band. The complete mathematical analytical relation between encoding and decoding is present and the robustness of the system to interference is examined. When some sub-channels are affected by interference or jamming, the system could regenerate the symbol from others. Simulation results show that the Anti-Interference UWB-OFDM （AI-OFDM） system has evident advantages over conventional UWB-OFDM systems as well as the Interference Suppressing UWB-OFDM （IS-OFDM） in Bit Error Rate （BER） thanks to its robustness to interference. In the case of bad interference, the AI-OFDM system could work up to snuff without any anti-interference step, but the conventional UWB-OFDM system couldn＇t. Compared with the ISOFDM system, the AI-OFDM system improves the performance about 5 dB in Signal-to-Interference Ratio （SIR） and the order of 1-2 in BER.

关 键 词：ULTRA-WIDEBAND ANTI-INTERFERENCE CODING OFDM 

分 类 号：TN911[电子电信—通信与信息系统]