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
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
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
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
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
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
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.
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)
Digital communication :: 10-30-2008 01:56 :: Communications_Engineer :: Replies: 3 :: Views: 1327
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
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
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
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
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.
Digital communication :: 04-08-2013 12:37 :: ipmax :: Replies: 4 :: Views: 888
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
in a PSSS system
Is R the symbol rate here?
and BW is still the channel bandwidth?
RF, Microwave, Antennas and Optics :: 08-09-2007 05:16 :: fanshuo :: Replies: 1 :: Views: 1308
is valid when input symbols have gussian distribution (please correct me if I am wrong)
but when input symbols are not gaussian distributed but are uniformly distributed binary symbols than how to find out the capacity for it ??
please recommend me some references ..
Digital communication :: 07-14-2008 08:18 :: urwelcome :: Replies: 3 :: Views: 3265
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
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.
Digital communication :: 09-05-2008 09:57 :: Bhanumurthy :: Replies: 5 :: Views: 1583
I was in taught howw to proves the shannons 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 shannons 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
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)
C = channel (...)
Digital Signal Processing :: 03-12-2007 14:26 :: qureshi :: Replies: 1 :: Views: 945
your question is vague. try rephrasing it.
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
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
channels of dimension 2BT/N can be creat
Digital communication :: 02-28-2010 08:02 :: moonnightingale :: Replies: 1 :: Views: 865
i want to know theory or more information on below topic.
"Co-channel system to transport two channels 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
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
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
RF, Microwave, Antennas and Optics :: 05-01-2006 11:42 :: salma ali bakr :: Replies: 1 :: Views: 916