Performance Analysis Of DCSK UWB System Over In-Body Channel

Wireless transmission technology based on ultra-wideband(UWB)has many innovative applications in the medical field which can improve the data transmission capability between medical implants and external units.The signal passes through human tissue,so the channel environment is complex.By using computer simulation,the main parameters can be obtained at the receiver.According to the parameters,we analyze the transmission characteristics of in-body channels,so we can establish a simulation platform,which is suitable for statistical models of UWB in-body transmission channels in 0.1GHz-1GHz and 1 GHz-6 GHz frequency bands.Chaotic ultra-wideband communication systems use chaotic digital modulation technology for transmitting information.These systems have good advantages for ultra-wideband short-range communication systems because of excellent performance in anti-interference,low power consumption and low cost.Firstly,this paper will analyze CS-DCSK system,and add the guarding interval to avoid Inter-Symbol-Interference for the CS-DCSK UWB system.We redesign the traditional CS-DCSK receiver based on the structure of the Walsh code,which make the system simpler.The bit error rate(BER)performance of the redesigned WBED receiver and traditional receiver is consistent over in-body channel.And when the spreading factor is small,the system BER performance of WBED receiver is better.Then,the MDCSK based on the phase-constellation is added the guarding interval to avoid Inter-Symbol-Interference.We analyzed the influence of guarding interval on the BER performance of MDCSK UWB system,we simulate over in-body channel,showing that the MDCSK UWB system can be used for ultra-wideband in-body channel,and electing the appropriate guarding interval can achieve better performance.