for awgn channel, qpsk with gray mapping can achieve the same bit error rate as a coherent bpsk in white gaussian noise, but the bandwidth efficiency of bpsk is twice that of qpsk.
considering the properties of the autocorrelation function rx(τ) of a random process x(t).
angle modulation can provide better discrimination against noise and interference than am modulation.
is the following statement true or false? realists tend to emphasize the role of inidual choice while naturalists view nature as indifferent in which human behavior is determined by biological, economic, and environmental forces.
when i talked with my grandma on the phone, she sounded weak, but by the time we ________ up, her voice had been full of life.
en grissom has decided to use information collected by the u.s. government in his upcoming research project on cultural trends. this is an example of using a _____ data source.
照相机的基本结构包括：机身、镜头、取景器、快门、( )
【判断题】螺旋桨搅拌机中的切向运动促使泥浆产生强烈的对流循环。
3d printing, also known as additive manufacturing (am), refers to various processes used to synthesize a three-dimensional object. 这句话的意思是 3d打印，又称减材制造（am），指的是堆积形成一个三维产品的各种过程的总称。