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The Difference Between

Ever wanted to know the difference between a boysenberry and a blueberry? socialism and communism? Windows and Linux? Look no further. This category answers your questions about 'The Differences Between...'

57,566 Questions

What are differences between different cultural symbols?

there are a lot of differences between cultural symbols like for example, Hindus

and Kurdistan Indians worship thousands of gods while Kurds only worship one.

What is the difference between finish nails and common nails?

Finish nails have a smaller, rounded head that can be driven flush with the wood so as to be less obvious.

What is the difference between flaccid and spastic constipation?

spastic is usually hard and can come with constrictive spasm in part of the instestine while flaccid is soft and what you make consider oily.

What is the difference between a cope and humeral veil?

The cope is a long, cloak-like tunic that is worn during special occasions such as Benediction of the Blessed Sacrament. The Humeral Veil is a 2.75 m long, 90 cm wide cloth, with a simple clasp or tie-string, at the breast. The Humeral Veil is used for holding sacred items such as the monstrance or Bishop's mitre.

How do you transform a group into a team?

Give them something to share together as a unit. Relate how common goals can transform a group into a team. Give examples of famous examples such as just about every football movie ever made. Ex. The longest yard.

What is the difference between Container yard and Container depot in shipping terms?

While similar in meaning: In the Freight Cargo delivery system,

Depot is used for temporary storage and forwarding of cargo to other locations. Usually the depot owner does not own the cargo/shipping containers or trailers that filter through the depot. The owner does usually provide equipment for loading and unloading of shipping/cargo containers as needed. i.e., forklift, etc.

Yard usually defines a local business owning, or in control of, shipping/cargo containers and other equipment for local rentals, sales, repairs, etc. Example - a local rental yard

What is the main difference between fdm and ofdm?

FDM and OFDM both have the same overlap!. In FDM the overlap is in the time domain. In OFDM the overlap is in the frequency domain.

First (you may already know this) the relationship between the rectangular pulse and the sin(x)/x (sinc) function:

A rectangular pulse in the time domain transforms to and from the sinc function in the frequency domain. A sinc function in the time domain transforms to and from a rectangular "brickwall" function in the frequency domain. In other words these two functions transform to each other by either FFT or IFFT.

In both FDM and OFDM we are taking multiple carrier frequencies, modulating them, then combining them for transmission.

For simplicity lets assume each carrier is on/off modulated. In idealized FDM, we modulate each carrier then

send each though a brickwall filter before combining to the antenna. Say the carriers are separated by 500KHz, (say at 1GHz + 500KHz, 1GHz + 1MHz ...)

Each carrier's 500KHz brickwall filter in the frequency domain cause a time domain spreading of its on/off pulses into time domain

sinc function with zero crossings every 1us.

Now, if we make the baud rate 1Mbps, each bit's ideal sampling point (center if eye) occurs at the zero crossing point of

all of the potentially interfering sinc functions from previously received bits. In other words there is lots of ISI, but none at the critical moment when the bits are sampled. This is called "signalling at the Nyquist rate" and is related to but not the same as

Nyquist sampling which you hear a lot about. (see en.wikipedia.org/wiki/Nyquist_ISI_criterion, apparently I am not allowed to include link because I am new to physicsforums).

Of course brick wall filters are hard to make, so we use things like raised cosine filters that create the same beneficial sinc zero crossings.

OFDM is analogous to FDM but with time and frequency domain reversed.

We on/off modulate our carriers, but they are combined as unfiltered rectangular pulses and sent straight to the antenna (simplification of course).

These time domain rectangular pulses become spread in the *frequency* domain as sinc functions.

If we on/off modulate each carrier at 1Mbps (1us symbol time), and simultaneously maintain 1MHz carrier spacing ("orthogonal"),

then the zero crossings of the sinc functions occur every 1MHz. Their positions are such that at each carrier frequency, all other carrier's smearing sinc functions have zero crossings. Thus each carrier frequency is free from interference.

Again there is plenty of interference between these signals, but none at the critical frequencies where the carriers are located.

Note the factor of 2 difference between the OFDM bandwidth and the FDM bandwith in my example. This is due to the convention of including negative frequency in the bandwidth in the OFDM case.

Naturally, there is much more to it than this, but this is the basics.

Hopefully you can figure out from this where the 50% comes from (look at the superimposed sinc functions).

What is the difference between violence and aggression?

Violence suggests unrestrained behavior which is often "explosive", combatative and is physically or mentally abusive. Violence is aggression, however aggression does not necissarily imply violence. Aggression implies one or more opposing parties imposing strong will toward the opposition which may escalate to violent aggression.

What is the difference between a switching transistor and an ordinary transistor?

In the switching transistor the output current is controlled by the (current) and this is also called current controlled current device (CCCD). But in ordinary switch we controlled output current physically...

What is the difference between steno-thermal and eury-thermal?

Stenothermal describes an organism unable to tolerate a wide range of temperature and Eurythermal describes and organism that can tolerate a wide range of temperature.

What difference between 1e6 and 10e6?

Both 1e6 and 10e6 represent the number 1,000,000, but they differ in their scale. 1e6 is simply a compact way of writing 1 million, while 10e6 indicates 10 million. The difference lies in the multiplier applied to 1 million.

What is the difference between hemophilia and thrombocytopenia?

thrombocytopenia results from insufficient amount of platelets and its caused by anything that suppresses the bone marrow such as bone marrow cancer, radiation, and certain drugs.

whereas hemophilia is a genetic disease and is the lack of any factors needed for clotting.

What is the difference between 0.3 and3?

0.3 is the same as 3 tenths of one (1.0) This can be written as 3 /10 or 3 over ten

Whereas 3.0 is equal to 30/10

Or

If you want the mathematical answer 3/10 +7/10 + 2.0 equals 3.0

the difference between 0.3 + 3.0 equals 2.7

What is the difference between provision and reverse?

Provisions are created in books as they are anticipated. Example: provision for depreciation

Reserves are created in books as a part of profits, which might used to purchase assets or to declare dividends.

What is the Difference between enabled and visible property of a menu control?

Enable=true : It will just enable the control. You can see the control and use it. Enable=False : You can see the control but Its kind of view only. The properties attached to the control won't work(for example mouse over , click etc etc). On the other hand visibility will either hide or show the control depending on the value you set.Visibility= True will show you the control and you can see and use it. When you set the value as false, it will stop the control from rendering in your form. You won't see the control. If its a webpage and if you can view the source code ,you won't find the contents of the control at all.

What are the differences between a sea dog and a buccaneer?

nothing they are both old pirates but a buccanere is a assasin pirate,and a sea dog is a old pirate who has lost their leg or arm at pirate war