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## Shannon Channel Capacity |

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1000 Threads found on edaboard.com: **Shannon Channel Capacity**

use **shannon** **channel** **capacity** theorem and classical thermodynamic Carnot's Law to derive the kT ln 2 minimum energy dissipation per bit for a communications **channel**.
Otherwise known as the **shannon**/Carnot Limit.
Can you express the noise mathematically?

Digital Signal Processing :: 12-08-2014 21:18 :: SunnySkyguy :: Replies: **2** :: Views: **167**

my professor told that there is no "**shannon**'s **channel** **capacity** law" for the 'cooperative network'.
i m very much interested in it. is there any white papers or books relating this topic.

Digital communication :: 12-28-2005 13:16 :: rednewguy :: Replies: **2** :: Views: **1492**

According to **shannon**'s theorem the **channel** **capacity** in a AWGN **channel** is given by: C=B log(1+S/N).
I have a doubt : Is C given in Bit rate ( Bits/sec) or Bauds (Symbols/sec) , if it is given in bit rate, I am not able to understand how the modulation schemes can be related to this equation. Could anyone please give an ex

Digital communication :: 04-21-2006 18:25 :: ahmad_abdulghany :: Replies: **1** :: Views: **2065**

Bandwidth is the range of frequency that suffers an atenuation less than 3db when the signal pass throught the **channel**.
**channel** **capacity** is the maximum information rate that a **channel** is able to transmite/receive.
The **channel** **capacity** and the bandwidth of a **channel** is (...)

Electronic Elementary Questions :: 11-10-2006 18:35 :: claudiocamera :: Replies: **1** :: Views: **5014**

What is the relations between **shannon** theorwm and **channel** coding?

Electronic Elementary Questions :: 06-03-2007 06:40 :: amiran2001 :: Replies: **4** :: Views: **1309**

Hi!
I'm in trouble to solve the **channel** **capacity** in the case of BPSK using by matlab.
I can figure it out as a function of SNR.
I think that I'm confused the SNR and Eb/No.
Does anyone tell me how to solve it? And does anyone have a matlab file which is about **shannon** limit?

Digital communication :: 07-17-2009 01:00 :: horizon982 :: Replies: **2** :: Views: **1568**

Hi everyone,
I want to know that **channel** badwidth of 5MHz in case of WCDMA and data rate or chip rate of 3.84Mcps are somehow related ?
If yes then what is the relation ?
One relation I have come across is **shannon**'s Relation but in that case we also need to know the SNR to calculate the data rate ?
Thanks in advance

RF, Microwave, Antennas and Optics :: 12-30-2012 10:15 :: nitink19 :: Replies: **4** :: Views: **849**

Hi Changfa,
I didn't mean to prove eq (3) by (1) and (2), i meant to show how Eb/N0 and Es/N0 are related to the SNR in eq (3).
it is evident that C is an intrinsic property of the you know, by definition, **channel** **capacity** (C) is the maximum data rate at which reliable transmission of information over the **channel** is possible.And acc

Digital communication :: 01-18-2007 00:14 :: amihomo :: Replies: **11** :: Views: **16502**

Hi,how can I plot the **channel** **capacity** using Matlab for average SNR from 0 dB to
30 dB if the CSI is log-Normal distribution ,What is the Average SNR and what is the difference between Average SNRand SNR,how can I calculate the best standard deviation that gives me high **capacity** .Only given to me the previous range (They want of me to plot (...)

Digital communication :: 11-09-2006 16:40 :: electronicman :: Replies: **0** :: Views: **1611**

Hi,
By definition, **channel** **capacity** (C) is the maximum data rate at which reliable transmission of information over the **channel** is possible.
At rates Rchannel is possible and at rates R>C reliable transmission is not possible.
**shannon** formula states that (...)

Digital communication :: 01-18-2007 00:45 :: amihomo :: Replies: **2** :: Views: **1173**

Dear friends
In Cover & Thomas book, it is said that the dual of **channel** **capacity** theorem (RH), but I am confusing that what is the definition of R (code rate) in Data Compression and also how can I prove that?
Is the definitio of R in Data compres. the same as the defin. of R

Digital communication :: 05-18-2008 04:41 :: hrhgroup :: Replies: **0** :: Views: **737**

HI
Is **channel** **capacity** described by number of bitstransmission.
Adding; if i have a **channel** **capacity** of 1 bit does that mean that i couldn't use QAM modulation.
thanks

Digital communication :: 05-25-2008 10:47 :: IBO :: Replies: **6** :: Views: **1071**

how can i find the **channel** **capacity** for cascade binary symmetric **channel**?
plz help me
Added after 23 minutes:
two binary symetric **channel** are connected in cascade find the **channel** **capacity**

Electronic Elementary Questions :: 07-23-2008 11:20 :: goodtime :: Replies: **1** :: Views: **1681**

Please use MATLAB to implement.
you have to discritize it eg. 0 to 30 db for SNR and than find the **capacity**.
Actually there is no other way to find the **capacity** without formulae. The formulae you mentioned is the **capacity** formulae of **shannon** its absolutely right

Digital communication :: 08-16-2008 05:29 :: bhq :: Replies: **5** :: Views: **3550**

Hello, can some one please provide me a document or just discuss it here, how to calculate the **channel** **capacity** for different modulation techniques. I do have many books but they are not easy to understand. Maybe some lecture notes (video will be naturally preferred)
Thanks

Digital communication :: 10-30-2008 01:56 :: Communications_Engineer :: Replies: **3** :: Views: **1327**

hi
i m new in communications.
what is **channel** **capacity**?
i want to know about what is the effect of **channel** **capacity** enhancement? Is it possible that one can enhance the **channel** **capacity** and how? what tools are used for this purpose.
I have read some articles but i can't get much understanding.

Digital communication :: 12-09-2010 08:47 :: syeda amna :: Replies: **4** :: Views: **569**

Hi everyone here,
This is my first question in this forum.
Can any one tell me how to find the **channel** **capacity** associated for a **channel** with the transition probability matrix. this matrix is as

Digital communication :: 05-15-2012 07:28 :: Steeve-123 :: Replies: **1** :: Views: **495**

Hello everyone,
I am trying to find the MIMO **channel** **capacity** for a 2x2 MIMO system using the standard **capacity** relation which is also available here
My measured channal matrix H was contructed using S21 measured with a Network Analyzer between each of the two

Digital communication :: 09-26-2014 18:47 :: rizwanmasood :: Replies: **0** :: Views: **251**

Hi
I'm trying to simulate the **channel** **capacity** with BPSK inputs in energy per bit to noise power spectral density ratio(Eb/N0). The formula which I used is written at the end. As snr=rate*Eb/N0, which is correct in that formula for simulation?
1-I replace snr=(C/α)*Eb/N0 in that formula and solve a fixed point equation ?
2-I simulate C in s

Digital communication :: 10-20-2014 12:41 :: niki25 :: Replies: **0** :: Views: **187**

what is meant by cooperative networks in mobile communication. I heard that there is no **shannon** **channel** **capacity** law for this network yet, is it so.

Electronic Elementary Questions :: 09-17-2005 11:36 :: rednewguy :: Replies: **0** :: Views: **891**

In an excel spreadsheet I am comparing the **channel** **capacity** performance of FSK and QPSK.
I know from my studies that QPSK transmit 2 bits per symbol wheras FSK can transmit 1 bit per symbol. This means that QPSK can send the same amount of bits as FSK using half as much bandwidth that FSK uses or QPSK can send twice as many bits as FSK using the

RF, Microwave, Antennas and Optics :: 10-07-2008 15:24 :: robismyname :: Replies: **2** :: Views: **2942**

Hello all,
In my project, I am trying to achieve near **shannon** performance for 4x4 MIMO using 16 QAM on rayleigh fading **channel**. For that i need to calculate the **shannon** **capacity** of rayleigh fading **channel** for 4x4 MIMO. Whats the formula/approach for that?
Is this code doing it right way?

Electromagnetic Design and Simulation :: 10-16-2012 12:11 :: varun_vkjain :: Replies: **1** :: Views: **438**

Hi Community,
I am trying to calculate the **capacity** of AWGN **channel** (y = hx + n). I was using the **shannon** formula C = 0.5log2(1+SNR) where SNR = sigma^2(Tx Signal)/sigma^2(Noise). However, I am wondering how can I calculate the **channel** **capacity** for M-PSK constellation. For example QPSK and 16QPSK.
Help (...)

Digital communication :: 04-08-2013 12:37 :: ipmax :: Replies: **4** :: Views: **888**

Hi
I think answer of mkhan is not true.
**capacity** is the same in all of the mentioned method. **capacity** is just depend on SNR and BW.
**capacity** of the **channel** is the famous work of **shannon**.
**capacity** is not depent on modulation but it is different when transmitter have some knowledge about (...)

Digital communication :: 05-20-2007 07:13 :: m_llaa :: Replies: **7** :: Views: **2892**

the **shannon**'s law
R=BWlog2(1+C/N)
in a PSSS system
Is R the symbol rate here?
and BW is still the **channel** bandwidth?
Thanks!

RF, Microwave, Antennas and Optics :: 08-09-2007 05:16 :: fanshuo :: Replies: **1** :: Views: **1308**

Digital communication :: 07-14-2008 08:18 :: urwelcome :: Replies: **3** :: Views: **3265**

Hi Friends,
Pls culd any one give me some clue or idea in calculating the **capacity** of a **channel** using QPSK and 16QAM as the modulation means , given the system bandwidth and Eb/No ?? From
C=Wlog2( 1 + (R*Eb)/(N0*W) ) = Wlog2(1 + SNR ).
My thinking is that if C gives me my **capacity** then what wuld be R ( bit rate ) which really is (...)

Digital communication :: 08-05-2008 08:28 :: great55 :: Replies: **6** :: Views: **5339**

Hi,
Each parameter is defined separately,but all are related in one form or another.It's like this: S/N is defined as The ratio of Average Signal Power to Noise Power.Generally S/N is measured at the output of the receiver and as per ITU regulations, the S/N that should be acheived at the output of the telephone **channel** is 50dB.
Now,Spect

Digital communication :: 09-05-2008 09:57 :: Bhanumurthy :: Replies: **5** :: Views: **1583**

I was in taught howw to proves the **shannon**s **capacity** formular using by takng into conideration a n-hyperspace of uncertanity where the noise resides. It more like the geomteric proof of **shannon** formular
I have two problems
1) he modelled signals like a round circle and noise around it like a round circle. and he said the sphere of (...)

Digital communication :: 10-26-2010 15:28 :: persistence911 :: Replies: **0** :: Views: **1798**

QPSK is only a modulation scheme. i.e. the Eb/No in **shannon**s theorem becomes Es/No. i.e Eb/No= Es/No *1/R . for QPSK we transmit twoice the number of bits as BPSK i.e. M=2.
**channel** **capacity** theorem a.k.a. **shannon**'s Theorem.

RF, Microwave, Antennas and Optics :: 07-13-2011 18:11 :: kalyanasv :: Replies: **2** :: Views: **735**

Hello everyone,
I have this little task to do and I need your help. I have to plot the **capacity** of an AWGN **channel** and a fading **channel** in function of the SNR. The code must be written in Matlab.
Can someone please give me some hints of how to get started, what the input of the **channel** should be, etc..
I really (...)

Digital communication :: 01-22-2013 11:20 :: CAROLEbecks :: Replies: **3** :: Views: **1167**

which are white gaussian **channel** characteristic
thank you for help

Digital communication :: 01-22-2007 04:50 :: tti :: Replies: **4** :: Views: **730**

Hi,, man Q refers to the Quality factor or the selectivity of the Resonant circuit, Selectivity is the reciprocal of Bandwidth,, whereas the bit rate is the **channel** **capacity**, which refers to **shannon**'s **capacity** formula such that:
C = B log base 2 (1+SNR)
Where,
C = **channel** (...)

Digital Signal Processing :: 03-12-2007 14:26 :: qureshi :: Replies: **1** :: Views: **945**

your question is vague. try rephrasing it.
P.S:
Are you looking for **shannon**'s **channel** **capacity** theorem?

Digital Signal Processing :: 04-17-2007 10:21 :: hurrynarain :: Replies: **3** :: Views: **7314**

what is the difference between bandwidth and information **capacity**

Electronic Elementary Questions :: 05-25-2007 10:06 :: sayurabh :: Replies: **1** :: Views: **922**

How to approach the **capacity** of WLAN? Anyone can suggest papers or ideas?

Digital communication :: 06-13-2007 17:05 :: pmonon :: Replies: **4** :: Views: **750**

Dear friends,
What **capacity** is when defined as "bits per **channel** use"
"bits per complex dimension"
"bits per symbol"
"bits per second"
I dont understand the difference between them..
plz if you can explain it..
thanks ...A lot of thanks

Digital communication :: 10-09-2007 11:02 :: urwelcome :: Replies: **3** :: Views: **2167**

Hi, What is the physical meaning of saying that "the CSI is known at Receiver or at transimitter" .I know that CSI is a **channel** state ,but when I counterd **channel** **capacity** calculation I found there are some differences between the CSI at receiver **capacity** and CSI known at transmitter and receiver , I couldn't I understand or im

Digital communication :: 11-13-2007 18:16 :: mkhan :: Replies: **1** :: Views: **639**

Outage probability is related to the **channel** **capacity** which returns to the **channel** model assumed of course, differing from each relay to another makes a relay can contribute in cooperation or not which is mainly based on its Outage probability or in other terms outage "**capacity**" which is limited by Signal To Noise ratio (...)

Digital communication :: 11-09-2009 03:13 :: mohamed_bakr :: Replies: **5** :: Views: **2880**

Dear Bulx, I appreciated your answer but it was not what I was asking for.
I am aware about the limit posed by the **channel** **capacity** theorem by **shannon**
C = B log2(1+SNR)
that for a 25 kHz **channel** and a target sensitivity of 10 dB gives us the theoretical **capacity** limit of 166455 bps that is in the (...)

Digital communication :: 02-27-2010 15:02 :: mowgli :: Replies: **5** :: Views: **961**

In book of Andrea Goldsmith, it is written that
"TDMA, FDMA, and orthogonal CDMA
are all equivalent in the sense that they orthogonally divide up the signaling dimensions, and they therefore create
the same number of orthogonal particular, given a signal space of dimension 2BT, N orthogonal
**channel**s of dimension 2BT/N can be creat

Digital communication :: 02-28-2010 08:02 :: moonnightingale :: Replies: **1** :: Views: **865**

Hi all,
i want to know theory or more information on below topic.
"Co-**channel** system to transport two **channel**s on the same RF carrier using two different polarizations of the transmitted electric signal"( here antenna will be fixed in one position)
thanks and regards
roshni

RF, Microwave, Antennas and Optics :: 04-13-2010 06:13 :: disisku_22 :: Replies: **0** :: Views: **429**

Th 3db BW is 2KHz.
**shannon** has a **channel** **capacity** theorem: C=B*(1+SNR) but that is only for **capacity**.
Here bandwidth measurement is a differential measurement i.e. it can be 2KHz centered at f=0Hz.
When you multiply 3db_BW *f you are effectively increasing the BW which is definitely not the signal BW as shown above. (...)

Digital communication :: 07-20-2011 07:40 :: kalyanasv :: Replies: **5** :: Views: **589**

has a transfer characteristic |H(f) given in the link below. The transmission is at maximum error-free rate of 4,800 bps. Compute the SNR (signal-to-noise-ratio) at the **channel** output. Does the output signal suffer from any distortion?
ImageShack? - Online Photo and Video Hosting

Digital Signal Processing :: 07-18-2011 11:14 :: naspek :: Replies: **1** :: Views: **673**

There is no direct relation between data rate and SNR. If you mean a **channel** **capacity** (maximum throughput rate), google the **shannon**-Hartley theorem.

Digital communication :: 09-10-2012 02:49 :: Mityan :: Replies: **4** :: Views: **492**

Search for the **shannon**-Hartley **capacity** formula ( bits/s = C = BW*log2(1+S/N) ).
This formula sets the maximum bitrate that you can get from a system with certain bandwidth and S/N ratio. In real world it is less due to non-optimum modulation/demodulation and other then gaussian noise.
When increasing distance, the received signal drops, henc

RF, Microwave, Antennas and Optics :: 12-25-2013 06:47 :: WimRFP :: Replies: **4** :: Views: **240**

The theoretical **channel** **capacity** (maximal achievable data rate with optimal modulation) is described by the **shannon**-Hartley theorem.
As a simple conclusion, it says that the available data rate under given conditions (S/N ratio, modulation method) is proportional to bandwidth.

Electronic Elementary Questions :: 06-02-2014 07:43 :: FvM :: Replies: **5** :: Views: **301**

Hi everybody,
I am confused about the concept of **channel** **capacity** when we are using multilevel and multiphase constellations such as 16 QAM. The maximum achievable **capacity** at high SNRs is 4 bits per symbol. But when we are using coding such as with rate = 0.85, how can we achieve this **capacity** of 4 bits per symbol. (...)

Digital communication :: 08-12-2014 15:46 :: mohsan :: Replies: **0** :: Views: **184**

What is Bandwidth?
In a digital communication system, bandwidth has a dual meaning. In the technical sense, it is a synonym for baud rate, the rate at which symbols may be transmitted through the system. It is also used in the colloquial sense to describe **channel** **capacity**, the rate at which bits may be transmitted through the system. Hence,

Electronic Elementary Questions :: 03-02-2006 01:21 :: IanP :: Replies: **2** :: Views: **796**

does anyone have any documentations on MIMO in smart antennas
thanks
Salma

RF, Microwave, Antennas and Optics :: 05-01-2006 11:42 :: salma ali bakr :: Replies: **1** :: Views: **916**

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