超声波发射电路主要由74LS04缓冲反向器和超声波换能器构成，单片机输出方波信号。 超声波接收由CX20106完成，CX20106具有内部前置放大，载波选频，脉冲解调等功能，在接收到超声波时，CX20106的7脚输出低电平。,Ultrasonic transmitter buffer by reverse 74LS04 and ultrasonic transducer consists of single-chip output square wave signal. CX20106 com

利用51单片机的两个定时器同时产生两路脉冲，其中一路为频率、占空比可调的PWM，另一路可以串行发送给定数据（即载波）。,The use of 51 single-chip timer at the same time the two have a two-way pulse, in which all the way for the frequency, duty cycle adjustable PWM, another way can be sent to the set of serial

本文对MIMO技术中的信道估计、空时编码和单载波频域均衡技术（SC-FDE）及其在FPGA上的实现进行了深入的研究-In this paper, MIMO channel estimation techniques, space-time coding and single-carrier frequency domain equalization (SC-FDE) and its implementation on FPGA-depth study carried out