spectrum

to temperature. Yes, Kelvin was the one that warmed the black iron to the 800° in the fire, and the iron block began to emit dark red. As the temperature rises, the color of the iron block begins to change from red to white, the higher the temperature, the greater the blue spectrum in the light emitted by the iron block, and the lower the red line spectrum. There is no need to dwell on this familiar proces

level of each communication unit, and suppressing interference is realized by encoding or direct sequence spread spectrum. However, in different wireless environments, the interference of the special-purpose system and the dynamic range of the useful signal change greatly. In the case of more than 50dB and different ambient power differences, it is not enough to achieve 1mb/s above rate, only by encoding and processing gain. Conversely, it is easier

. The criteria for assessing the most applicable systems are generally determined by the following factors: User requirements: To consider the type of business and the density of traffic, but also consider its performance price than the majority of users can withstand. Spectrum efficiency: To analyze the characteristics of different air interface technology system, especially its spectrum efficiency can s

First, observe　　A new requirement in the project, you need to add a color picker control to the control library, because the company has not yet UI design big guy Check in, so start looking for all kinds of colorpicker from the internet, look for me to see the Google Browser comes with, it long this kind:It looks good, you can do it! You have to look at some of the holes that might be in there. For WPF, the effects such as rounded shadows are basic operations, and this is not the point.First we

(convergence of the sequence of the keys), while many infinite-dimensional spaces are incomplete (such as continuous functions on closed intervals ). Here, a complete space has a special name: a complete Norm Space is called a real-name space (a real-name space), and a complete inner space is called a Hilbert space ). In a finite dimension space, space and its dual space are completely homogeneous. In an infinite dimension space, they have subtle differences. In a finite dimension space,

Traditional communication systems are usually fixed-frequency communication systems. The information to be transmitted uses a fixed bandwidth, and the signal is modulated to a fixed frequency band and then transmitted over a channel (wireless or wired. Any other signal in this channel will interfere with useful signals. Therefore, a communication system with such characteristics is called a fixed-frequency communication system with an exclusive Channel. In contrast, the wireless signals sent by

This article mainly introduces the principles of CDMA wireless network technology in detail, and gives you a detailed explanation. I believe this article will help you. In fact, the CDMA technology has been used long ago. It may be that, for various reasons, the introduction of China has not been able to fully leverage its advantages. So what are the specific advantages of it? What is the principle? I will not go into detail here. Please refer to the following. CDMA, short for Code-DivisionMulti

strive for NLOS-FWA. In this way, the client is easy to install and the performance is equivalent to that of ADSL-modem. Ii. Difficult to popularize line of sight transmissionIn order to be practical, FWA of the Fixed Wireless Access Network must be widely adapted to various situations on the ground. Regardless of the terrain, region, and population density, wireless communication must be smooth. In addition, compared with the wireless cellular network of mobile communication, this fixed wirele

MATLAB for speech signal plus random noise and denoising program(2011-01-28 23:26:51)% The original time-domain waveform analysis and spectrum analysis for language signals[Y,fs,bits]=wavread (' C:\Documents and settings\administrator\ desktop \cuocuo.wav ');% Sound (Y,FS)% playback of voice signalsN=length (y)% Select the number of points to transformY_p=fft (Y,n); % Fourier transform to frequency domain for n pointsf=fs* (0:n/2-1)/n; % corresponds t

1. Frequency band (Band)The so-called frequency band , refers to the wireless decoder in the specified degree of distortion and rated output power of the operating band width, refers to a frequency range or the width of the spectrum , that is, the minimum operating frequency of the wireless decoder to the maximum operating frequency range, The unit is Hz. For convenience, in LTE, a digital 1-43 is used to denote different bands (36101-v10.21.0 version

). Here, a complete space has a special name: a complete norm space is called a real-name space (a real-name space), and a complete inner space is called a Hilbert space ). In a finite dimension space, space and its dual space are completely homogeneous. in an infinite dimension space, they have subtle differences. In a finite dimension space, all linear transformations (matrices) are bounded transformations, while in an infinite dimension, many operators are unbounded (unbounded ), the most

The IEEE Spectrum website publishes its annual ranking of programming languages, which is the fourth edition of the list of programming languages they have published.It is understood that the sorting of IEEE Spectrum is a synthesis from 10 important online data sources, such as Stack Overflow, Twitter, Reddit, IEEE Xplore, GitHub, etc., ranking in 48 languages.Unlike other sites surveyed by the leaderboard,

) color differences (ignore the color spectrum, screen output and the so-called intrinsic color difference between). Primary Color spectrum BrownBrown is the most common color of human iris. The brown iris contains a lot of melanin, and the dark brown iris looks like black. The brown iris is thought to be the dominant gene in the human iris, but recent studies suggest it is not necessarily true. Li

because of the color of scattering, and red is due to the color of bleaching. When light brown mixes with blue, it becomes green, and red and blue are purple. Below we use layer 20% transparent overlay to do a series of chromatography, to show the different iris (cough, this is professional) color differences (ignore the color spectrum, screen output and the so-called intrinsic color difference between). Primary Color

sampling point n unchanged, to improve the resolution of the Spectrum (f reduction), the sampling rate must be reduced, the reduction of sampling rate will cause the spectral analysis range to be reduced; If you maintain FS unchanged, you can increase the number of sampling points to increase the resolution N. 2. Error problem of spectral analysis using DFT (1) Aliasing using DFT to approximate the Fourier transform of continuous time signal, in

, and may reach 1:3 in 5 years, that is, wireless access is entering a fast-growing phase.High-frequency segment, wide bandwidth, high speed, high spectrum utilization: With the diversification of user business, especially broadband, the information rate of the past Kbps or more than 10 kbps is not enough, many users require dozens of Mbps information rate. To improve the information rate, in addition to the use of advanced duplex technology, coding t