Research On The MB-IR-UWB System Based On MIMO And The Algorithm Of Equation

As the rise of the network of wireless lans(WLANS),unlimited personal networks(WPANS)and home entertainment network,the requirement of short-distance high-speed communications business is increasing.The ultra-wide-band system become one of the solution of short-distance high-speed transmission.For a multiband impulse radio ultra-wide-band(MB-IR-UWB)system,it has been proved that it can improve the data transmission rate,flexibly use spectrum and acquire frequency diversity and multiplexing gain.In order to further improve performance of the MB-IR-UWB,multiple input and multiple output(MIMO)technology is introduced,and a new MB-IR-UWB system based on MIMO is given.MIMO technology is able to increase the channel capacity without increasing the transmission power and bandwidth.So,for this system,it is possible to enlarge capacity,flexibly use spectrum and show potential to obtain space-time frequency diversity and multiplexing gain.It will be the important research of high-speed and short-range communication.Firstly,this paper gives the overall model of the MB-IR-UWB system based on MIMO,including system model、 signal model of transmitter and receiver.In this paper,to illustrate the performance of the proposed system,we added two contrast multiband MIMO systems,established the simulation model of comparing three channel capacity and the BER performance.And,to balance the space-time frequency diversity multiplexing gain,our system also introduce the space-time frequency coding.Finally,we theoretically deduce channel capacity formula of the MB-IR-UWB system based on MIMO.And the simulation proves that channel capacity of the system will be increase as the increasing antenna number and subbands number;System can provide space-time frequency diversity multiplexing gain by space-time frequency coding,and the ber performance is improved.In addition,because of multi-stream interference(MSI),same frequency interference(SFI),and intersymbol interference(ISI),this article introduces the equalization techniques to reduce the effects of these interference to the system.Firstly,we gives the mathematical model of time reversal(TR)equalization technology and frequency domain equalization(FDE)technology,and then,under the different condition of systemparameters,we establishes the simulation model to compare anti-ISI,anti-MSI performance and channel robustness of the TR technology and FDE technology.The simulation results show that,when the channel autocorrelation and cross-correlation properties is enough ideal,the anti-MSI performance of TR technology is superior to the frequency domain equalization;When the channel condition tend to be not ideal,the MSI and ISI resistance of frequency domain equalization is better than that of the TR equalizer.Therefore,this paper gives the MB-IR-UWB system based on MIMO which can increase the channel capacity without any increase in bandwidth,channel capacity can increase with the band number and the antennas number increaseing;The space-time frequency diversity multiplexing gain of the system can be balanced through the space-time frequency coding;For interference existing in the system,the equalizer can be added to reduce the impact on data transmission.In this way,the system can meet the requirements of short-distance high-speed communication.