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Explaining the principle of OFDM to the "small white" illustration

the B-signal, is 0" after the integral, as described aboveFigure V: The received signal is multiplied by sin (2t), and the integral decodes the B signal. "As mentioned above, the sin (t) of transmitting a signal, after the integral is 0"Figure VI: FlowchartWhen you get here, you may have two states:One is: Ah, the original is so, I understand.One is: Ah, how can this, I completely can not imagine. The point here is that you don't have to imagine (visualize). The mathematics is so defined orthog

OFDM Understanding (reprint)

integral is 0"Figure VI: FlowchartWhen you get here, you may have two states:One is: Ah, the original is so, I understand.One is: Ah, how can this, I completely can not imagine. The point here is that you don't have to imagine (visualize). The mathematics is so defined orthogonal, the mathematical proof of their orthogonality, then they are orthogonal, "they can not interfere with each other to carry their own information." Choose sin (t) and sin (2t) as an example, and formally because they ar

User Authentication steps for mongodb3.X and mongodb3.x

. system. version. save (schema); 3. drop the user who used SCRAM-HAS-1 authentication before using the revoke use admin; db. createUser ({user: 'shang ', pwd: 'shang', roles: [{role: 'root', db: 'admin'}]}); // now create is to use MONGODB-CR authentication user 5, to enable auth mode restart use admin; db. auth ('shang ', 'shang'); 6. You can also create other users to use robo; db. createUser ({user: 'robo

Quality and innovation become the focus of GDC "state of Unreal"

to the price of its high-end PC VR helmet and motion controller, Oculus also announced that the company will give Epic 250 sets of Rift + Touch devices as prizes to developers for Unreal Dev Grants developer-funded projects. "Mechanical Reload" is now on the shelves The Epic original game "mechanical Reload", which was unveiled late last year at Oculus Connect 3, is the most important piece of the Unreal Engine's outstanding VR features, with exaggerated arcade moves, awesome battles and input

Complexity of Time

. http://www.cnblogs.com/wu8685/archive/2010/12/21/1912347.htmlWhen an algorithm contains recursion, the problem of computational complexity or the problem of solving the recursive equation is transformed.There are several common solutions:Iterative method:The recursive equation is expanded iteratively to make it a non-recursive sum, and then the estimation of the solution of the Cheng equation is achieved by the estimation of the sum formula.ExampleThe calculation time of an algorithm is: t (n)

Time complexity analysis of recursive algorithm

prove.Second, iterative methodThe calculation time of an algorithm is: t (n) = 3T (N/4) + O (n), where T (1) = O (1), iteration twice can expand the right side to:T (n) = 3T (N/4) + O (n)= O (n) + 3 (O (N/4) + 3T (N/42))= O (n) + 3 (O (N/4) + 3 (O (N/42) + 3T (N/43))As can be seen from the above, this is a recursive e

Time complexity analysis of recursive algorithm

prove.Second, iterative methodThe calculation time of an algorithm is: t (n) = 3T (N/4) + O (n), where T (1) = O (1), iteration twice can expand the right side to:T (n) = 3T (N/4) + O (n)= O (n) + 3 (O (N/4) + 3T (N/42))= O (n) + 3 (O (N/4) + 3 (O (N/42) + 3T (N/43))As can be seen from the above, this is a recursive e

Time complexity analysis of recursive algorithm

O (N2) is a solution of T (N), and then proved by the mathematical induction method. Second, iterative methodThe calculation time of an algorithm is: t (n) = 3T (N/4) + O (n), where T (1) = O (1), iteration Two can expand the right side to:T (n) = 3T (N/4) + O (n)= O (n) + 3 (O (N/4) + 3T (N/42))= O (n) + 3 (O (N/4) + 3 (O (N/42) +

Pandas time series Resample

The difference between resample and GroupBy:Resample: Resampling within a given time unitGroupBy: Statistics on a given data entryFunction Prototypes:Dataframe.resample (rule, How=none, axis=0, Fill_method=none, Closed=none, Label=none, convention= ' start ', Kind=None, Loffset=none, Limit=none, base=0)Where the parameters are deprecated.Let's start practicing.Import NumPy as NP import Pandas as PDStart by creating a series with 9 one minute timestamps.index = Pd.date_range ('1/1/2000', periods=

Soft Test Example 1

An instruction pipeline consists of 5 paragraphs, the time required for each segment as shown.----T------------2tThe throughput rate for a continuous input of 10 instructions is ().a.10/70t b.10/49t c.10/35t d.10/30tAnswer:First instruction-(---)-(--)-Second instruction-(---)-(--)-The third instruction-(---)-(--)-Because it is the assembly line, so the time for 3t instructions can not overlap, so every 3t t

The study of MVC structure in PHP5 _php

course, just a template class can not be said to be MVC, the real MVC is not so simple, specifically can refer to "JSF". "3t" is a template class, mainly read "controller" data and some special processing, finally through some simple template syntax to show the data, it has some characteristics of it? Resolution is fast, you can choose to use the HTML cache or PHP cache, of course, you can not cache, but also to achieve fast and stable web applicat

_php Foundation of MVC structure Learning in PHP5

analysis can be seen, the template is here to play a "view" role, of course, only a template class can not be described as MVC, the real MVC is not so simple, you can refer to the specific "JSF". "3t" is a template class, mainly read "controller (Controller)" Data and some special processing, and finally through some simple template syntax to show the data, it has some what kind of characteristics? Fast parsing, you can choose to use HTML caching o

2016 Best camera phone TOP10 recommended

large aperture can greatly increase the amount of light, while also bringing more natural effects of the outside of the blur. 12 million effective pixel with customized 6P lens to ensure that the film quality details richer, brightness performance is also better. In terms of hardware configuration, PRO 6 Plus has a Exynos 8890 processor, 14nm process and 12 core GPU, with a 4GB LPDDR4 memory and 64GB/128GB (UFS2.0) built-in storage. PRO 6 Plus built-in 3400mAh battery, support 24W fast charg

Study on MVC structure in PHP5

analysis can be seen, the template is here to play a "view" role, of course, only a template class can not be described as MVC, the real MVC is not so simple, you can refer to the specific "JSF". "3t" is a template class, mainly read "controller (Controller)" Data and some special processing, and finally through some simple template syntax to show the data, it has some what kind of characteristics? Fast parsing, you can choose to use HTML caching o

_php Tutorial on MVC structure Learning in PHP5

course, just a template class can not be said to be MVC, the real MVC is not so simple, specifically can refer to "JSF". "3t" is a template class, mainly read "controller" data and some special processing, finally through some simple template syntax to show the data, it has some characteristics of it? Resolution is fast, you can choose to use the HTML cache or PHP cache, of course, you can not cache, but also to achieve fast and stable web applicat

C # uses MongoDB to store files

; } return false; }Let's go inside the robo to see if the insert is successful.We can see the data.Fetch a piece of data from Mogodb PrivateTaskintAvatarid,stringCollectionName) { varTask = Task.run (() = { varUseravatar =getusercollection (CollectionName); varresult = Useravatar.asqueryable (). Where (x = X.avatarid = = Avatarid). Select (x =NewUseravatar {Avatar = X.avatar, Avatarid =X.avatarid}).

Vsan Witness Virtual Appliance

. Regular 3-node (or more-node) Vsan clusters still use traditional methods, witness component or scattered across all hosts in the cluster.Application ScenariosThe problem comes, Witness appliance is also on a host, and this host can not be a 2-node Vsan in a cluster of one, that is not to say or need 3 host? Since there are 3 hosts, then why bother to specialize, directly build a regular 3-node Vsan cluster can not?Well, that's a good question to ask, but the 2-node Vsan scenario is not the sa

Google Maps data algorithm

Each image in Google Maps and Google Earth has a URL, for example, the address of our school map is http://kh.google.com/kh?v=3t= TRSTRQQRSSTTTQTSS (this is the URL of the graph)The variable v=3 in the URL represents the projection algorithm of the satellite graph using the Mercator projection algorithm, v=2 represents another algorithm (no longer supported)variable T=trstrqqrsstttqtss, this is the image of the code, TRSTRQQRSSTTTQTSS is a similar "Q-

File Upload Method

browser window will stop for a long time, Not to wait, the program has been started, point stop, and then, Disconnect shared connection: net use \\myIP\c$/del complete 1 Uploading files using Telnet by:jiangyf@usa.net If the FTP is closed, SendMail also not, how to compile the file uploaded to the host? The method is simple: 1. The file to be uploaded is encoded with Uuedcode, and the file will become roughly the following: Begin 644 File.bat m.c! J95@T92TP, #503U!=:%=e6#5d9%!>,2q1d91c$l1d9,2p

Common Troubleshooting BIOS setup options detailed

, and then address CAs, so there is a delay in the middle, the proposal is set to 2 Clock (2T), so that SDRAM can quickly address the completion of addresses, so that memory performance can be improved, if the system is not very stable after the setup, then change to 3 Clock (3T). Some versions of the BIOS change 2T to fast, 3T to slow, but the meaning is the same. 2, SDRAM RAS pre-charge time When the RA

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