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# Ldpc Performance

15 Threads found on edaboard.com: Ldpc Performance

## Comparison of different digital FSK demodulation methods

Hi All, I am a newbie to demodulation and carrier synchronization. For low power demodulation the data after ADC in RX, what are the various algorithms algorithm available? A google search returned Viterbi, ldpc, Matched filter etc. For optimum demodulation, one also needs carrier synchronization for good BER performance? What techniques

## BER comparison with QC-LDPC and BCH code

For particular QC-ldpc code and BCH code, you have observed the SNR gap between the two codes from the simulation results. There is no need to know the theoretical SNR gap between them. So, I guess that you are talking about the theoretical performance of an ensemble of QC-ldpc codes. In this case, you can obtain the average weight (...)

## Iterative MIMO receiver in MATLAB

Hi all! I research the performance of MIMO and i need the MATLAB implementation for BER of iterative MIMO receiver that includes the exchange of soft information between equalizer and ldpc decoder in LLR form. Anyone can help?

## Help : Coderate on LDPC

Hi, I've simulated ldpc using matlab. I've tried to running it with coderate 1/2 and 1/4 in which coderate 1/2 has a better performance than 1/4. How can I prove this condition ? Is this related to Shannon Limit ? Really need your help :cry:..

## rate=15/16 QC-LDPC deg-var=3

I find out some good ldpc codes. There are rate=15/16 QC-ldpc codes with regular-3 variable nodes I want to know What code design method can provide good BER performance in such ultra-high code rate.

## DVB-S2 LDPC Performance

Hi! I need to simulate with Matlab a QPSK and 8PSK modulations using ldpc Coding. I need to obtain the theoricals graphs of the Eb/No and BER relationship for differents code rates and modulations (in fact, I need to obtain the graphs for Eb/No and BER relationship for a DVB-S2 system), but I can't find a BER formula for ldpc codes. Thanks!

## Optimal degree distributions for LDPC codes

Hello, In my project, i am using regular ldpc codes. But for better performance i should go with Irregular ldpc codes. people used to get optimized degree distributions for ldpc codes from the following site : LTHC: ldpcOpt but for the past 1 year it's not working, If any of you guys k

## LDPC decoding without soft channel information

hi, My receiver performs hard decision. However, decoding algorithms like product-sum and min-sum need the soft information. I've tried to map the received value {0,1} to {-1, 1} as the input of the min-sum decoder, but the performance is not good in low SNR. How to improve the error correction capability of the ldpc code when there is no soft

## How calculate BER far from Shannon Limit ?

Could you help me : How calculate BER far from Shannon Limit ???? "Bit-Error Rate (BER) performance that is within ????? db of the Shannon Limit"? and how calculate gab of degree distribution from the shannon limit ? the degree distributions from ldpc codes, which have performance gap from the Shannon limit, (...)

## Channel performance of OFDM over an AWGN......

Hi all! for OFDM system the noise is accurately controlled by the AWGN, right? so, if i choose AWGN, what kind of error corrections can i use. is it possible to use FEC, Rayleigh, turbo, red-solomon, ldpc, BCH or others with the AWGN together.... i appreciate feedback! thanks!

## How to show the performance of LDPC codes in respect to AWGN?

How to compare the different coding schemes with AWGN performane. For example I have ldpc codes ,how to show its performance with respect to AWGN . I mean how to show on graph using matlab that how far away this is from shannon limit. I am really very thankful to all of you to help me newcomer.

## urgent need help : ldpc in ofdm over wireless channel

hey guyz..... can anyone help me to combine the ldpc coding in ofdm coding to make it one system ever rayleigh wireless channel...i already got the coding of ldpc ofdm and rayleigh fading channel...just wanna someone to help me o relate all of those codes to become one system...and to see the performance of the system thank u for ur concern

## Which BER do we evaluate when checking system performance?

This is really up to your needs. If you focus on uncoded systems, you just look at the BER out of detector. For example, when you design a space-time code and want to see how much diversity the code can achieve, you look at uncoded BER. If you study certain kind of channel code, Turbo code, ldpc, etc., you need to know how close your code is

## QAM demapping to LDPC decoder

QAM soft demapping is independent to the channel coding (ldpc Viterbi, Turbo). The best performance is LLR, using the max-log approximation, the LLR is equivalent to the slicer as the classical hard decision boundary, the only difference is that more quatization levels are used for soft demapping.

## Looking for a Springer document about performance analysis for OFDM system

hi, can any one ps send me the follwoing springer document performance ANALYSIS OF CHANNEL ESTIMATION FOR ldpc-CODED OFDM SYSTEM IN MULTIPATH FADING CHANNEL" By Zhu Qi , Li Hao and Feng Guangzeng Journal of electronics, Volume 23, Number 6 / November, 2006 ISSN: 0217-9822 (Print) 1993-0615 (Online) DOI: 10.1007/s11767-005-0021-1 Spr