dwdm spectrum

Dense Wavelength Division Multiplexing (DWDM) technology provides a huge transmission capacity for communication networks and gradually becomes a mainstream transmission technology. With the maturity of DWDM technology and the rapid growth of transmission capacity, traditional electronic exchange systems are under increasing pressure, and the introduction of optical exchange technology is becoming increasin

between 1.25MHz and 28 MHz instead of fixed. Main test parameters of Power Amplifier For general power amplifiers, focus on the following test parameters: (1) power gain, reflecting the amplifier's signal amplification capability; (2) 1 dB compression point, reflecting the linearity of the amplifier, that is, the amplifier's ability to enlarge large signals; (3) maximum output power. In fact, the first two indicators can reflect the maximum output power available for the amplifier. They are tes

highest signal strength nearby and send and receive data through this AP to maintain uninterrupted network connections. This is called wireless roaming. 2. Most WLAN devices use the Spread Spectrum Technology. The Spread Spectrum Technology was originally a broadband wireless communication technology used in the military communication field. The Spread Spectrum

, correlation analysis, and other mathematical processing on the signal. Figure 6.4-1 The signal after the periodic extension is different from the real signal. The following shows the error caused by this processing from the mathematical point of view. Cosine SignalX (t)The time-domain distribution is infinitely long (-∞, ∞), When the rectangular window function is usedW (t)Returns the truncation signal when it is multiplied.XT (t) = x (t) W (t). Returns the

"Hahahaha, Yi Laozi ?! How can I compete with Mr. Min, who is famous for dancing ?! How can he compete with me ?!" In the flame, the moon King said with great contempt. He did not know, but he really looked down on the hero spectrum, and also looked down on yibu. The hero of the world, wenwupu, also known as "Heaven and Man", has a total of two pieces of money and Wu. Here, the "biography of the martial arts" is specially recorded as the talents of th

residential areas, interference from other users in the residential area, and interference from users' own multi-path. EB/No, which refers to the power spectral density of white noise. The unit is w/Hz, and no is short for noise. (Related to the device sensitivity, such as the demodulation threshold) EC/Io, Eb/NT EC/Io and Eb/NT cannot be said to be two standards. They are two Representation Methods of signal processing at different stages, EC/IO indicates the ratio of the Code piece ener

changes.1) Basic Principle of Shield Attenuation measured in GTEM ChamberAfter the RF signal generator is amplified by power, it is fed to the input port of the GTEM chamber, and the Uniform Electromagnetic Field is stimulated in the GTEM chamber. Cut off the four Shielded Cables for a long period of 30cm and end the F-type cable plug on both sides. End one end of the cable with a well-shielded 75Ω load resistance, and the other end is connected to the cable plug in the GTEM chamber to keep the

are in the top 11 rankings or confident that you can be equal to or even surpass that of the eleven top ten. Otherwise, it is impossible for anyone who has read the rankings of hero spectrum-Biography of Wuzhi to dare to challenge this peerless hero. "The twelve places in the hero spectrum, His Royal Highness, are not invincible in the world ?" However, is Zhuge qingkang comparable to ordinary people? Know

Web page Spectral music column is a series of music on the Web Player, a serial seminar, music audio-visual as a Web page player portal, will be the best and most complete original works dedicated to everyone. When you read, you should follow the chronological order of the published time. Because she is a step-by-step lesson plan, sequential research helps to improve your understanding and digestion as soon as possible. Understand the place to read carefully, do not understand the place to bite

apples. The sensor in the user's eye responds to the reflected light and launches the message, which is interpreted by the user's brain as red. The user's sense of red depends on the apple, the light, and itself. An apple may absorb more green and blue than another apple, so its color looks redder. If the clouds cover the sun, the red of the apple becomes dim. Users ' feelings about the Apple are also influenced by their own physical conditions, the experience of eating an apple, or the fact th

follows:Set 1 for speaking, 0 for silent (mute or very weak), reference (distal) signal X (t) and receiver (proximal) signal y (t) may be combined in the following ways: (0,0), (0,1), (1,0), (x), (0,0) means far End and near end are relatively weak sound, (a) means the far end and the near side are relatively strong sound, WEBRT C code by default Two other cases is not possible.Set at the time interval p, namely p=1,2,..., p, band q,q=1,2,..., Q, the input signal x plus windows (such as the Hen

participated in the database implementation and operation of Vplex bi-active and ASM double-live, and has a practical experience to talk about the two current dual-activity programs.First, we talk about the main differences between extended RAC and common RAC. Mainly distance, distance is to prevent such as natural disasters, terrorist attacks and other data center damage, another database center can still provide services. However, the distance will bring additional network and IO delay, so th

1, why the Fourier transform, what is the physical meaning of it?Fourier transform is a very important algorithm in the field of digital signal processing. To know the meaning of Fourier transform algorithm, we must first understand the meaning of Fourier principle. Fourier principle shows that any continuous measurement of the timing or signal, can be expressed as a different frequency sine wave signal infinite superposition. The Fourier transform algorithm based on this principle is used to ca

have obtained good recognition results, they are very complex. In this paper, we propose a lightweight approach, which is similar to scenario analysis and is data-driven, but does not take advantage of any prior knowledge of the structure of music. The basic starting point of our approach is to compress redundant data [1], the idea of redundant compression has developed rapidly in the past few years, and has achieved very good results in many applications. Recent redundancy compression has been

First, the introduction of rapid FourierThe Fourier principle indicates that any sequence or signal of continuous measurement can be expressed as an infinite superposition of cosine (or sine) wave signals of different frequencies. FFT is a fast algorithm for discrete Fourier transform, which can transform a signal into frequency domain. What is the use of it in practical applications?1. Some signals in the time domain is difficult to see what characteristics, but if transformed into the frequenc

Procedure 1: FS = 22050; % voice signal sampling frequency: 22050 X1 = wavread ('windows critical stop.wav '); % reads audio signal data and assigns it to the variable X1 Sound (x1, 22050); % play voice signal Y1 = FFT (x1, 1024); % perform 1024-point FFT transformation on the signal F = FS * (0: 511)/1024; Figure (1) Plot (X1) % to make the time domain image of the original voice signal Title ('original speech sign '); Xlabel ('time n '); Ylabel ('fuzhi n '); Figure (2)Freqz (X1) % plot the fr

International standard for wireless networks), which mainly defines the physical layer and Access layer (MAC) of the network, where the MAC layer is the focus. Below the MAC layer, 802.11 specifies three transmit and receive technologies: Spread spectrum (Spread Spectrum) technology, Infrared (infared) technology, narrowband (Narrow Band) technology. And spread spectru