Rank: 103 based on 422 downloads (last 30 days) and 9 files submitted
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Hamid Ramezani

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TU DELFT

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PhD student, electrical engineering, circuit and system group

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Files Posted by Hamid View all
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13 Jan 2012 Screenshot Two cool problems, solved by matlab codes The solution of two stochastic problems. Author: Hamid Ramezani stochastics, signal processing, mathematics, enigma 6 0
09 Dec 2011 Screenshot Single target Localization distance based localization of a single target Author: Hamid Ramezani communications, optimization, signal processing, measurement, automotive 17 0
08 Dec 2011 Screenshot Capacity Maximization in Multiuser OFDMA system The complete project of OFDMA system. It tries to maximize the network capacity. Author: Hamid Ramezani ofdm, capacity, channel, pilot, power allocation 59 0
10 Apr 2008 Screenshot Alamouti STC for MIMO System Alamouti Space Timem Coding Author: Hamid Ramezani aamouti, mimo, timem, multi antenna, m, stc 27 4
  • 3.33333
3.3 | 3 ratings
24 Mar 2008 Screenshot greedy algorithm in OFDM resource allocation (single user) the implemention of greedy algorithm in mex file Author: Hamid Ramezani greedy algorithm, resorce allocation, wireless, ofdm, optimization, mex file 38 3
Comments and Ratings by Hamid View all
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08 Dec 2011 OFDM LSE Channel Estimation the performance of LSE channel estimation will be evaluated based on bit error rate in received data Author: Hamid Ramezani

Dear Aydar,

Thanks, and it is funny that you waited two years, I am really sorry for that. :) you know sometimes the life does not go as you expect.

08 Dec 2011 OFDM LSE Channel Estimation the performance of LSE channel estimation will be evaluated based on bit error rate in received data Author: Hamid Ramezani

Dear Aydar,

If we want to evaluate the performance of BER without any power limit on the transmitter, and we only consider the SNR on the data, (not pilots) then your right. Regarding your comment I recently submitted a project here, which will be published soon. There, we can see how the power allocation among pilots and data affects the total capacity of the network. I hope it would be helpful for the people who are interested in this field of study.

Hamid.

07 Dec 2011 OFDM LSE Channel Estimation the performance of LSE channel estimation will be evaluated based on bit error rate in received data Author: Hamid Ramezani

To Aydar Zimaliev,
Thanks for your comment. In practical scenarios in which the power is an important resource of the system, we should consider the overall performance of the systems. And as you know, the transmit power limit put a condition on the overall transmission power and it is not different for pilots or data. For the optimum power allocation between pilots and data please see the following paper: "On the Power Allocation and System capacity of OFDM Systems Using Superimposed Training Schemes".

However, if we consider the power allocation of pilots and data disjointly, then you'r right.

Hamid.
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08 Dec 2011 OFDM LSE Channel Estimation the performance of LSE channel estimation will be evaluated based on bit error rate in received data Author: Hamid Ramezani Ramezani, Hamid

Dear Aydar,

Thanks, and it is funny that you waited two years, I am really sorry for that. :) you know sometimes the life does not go as you expect.

08 Dec 2011 OFDM LSE Channel Estimation the performance of LSE channel estimation will be evaluated based on bit error rate in received data Author: Hamid Ramezani Zimaliev, Aydar

Hello Hamid,
Thanks again. Didn't have to wait this time another 2 years ;)
Ok, now I understood what you mean.
Must admit, it was quite confusing - your script actually doesn't provide only pure link-level simulation results but has also some system-level assumptions on top of it.
08 Dec 2011 OFDM LSE Channel Estimation the performance of LSE channel estimation will be evaluated based on bit error rate in received data Author: Hamid Ramezani Ramezani, Hamid

Dear Aydar,

If we want to evaluate the performance of BER without any power limit on the transmitter, and we only consider the SNR on the data, (not pilots) then your right. Regarding your comment I recently submitted a project here, which will be published soon. There, we can see how the power allocation among pilots and data affects the total capacity of the network. I hope it would be helpful for the people who are interested in this field of study.

Hamid.

07 Dec 2011 OFDM LSE Channel Estimation the performance of LSE channel estimation will be evaluated based on bit error rate in received data Author: Hamid Ramezani Zimaliev, Aydar

Hi Hamid,
thanks for your reply.
I dont remember what i meant by different power on data and pilots nor the details of your code. Maybe i was wrong about the power thing but i see now in your code:

Ep = 2; % energy in pilot symbols in comparison to energy in data symbols.

Anyways, what I wanted to point out that according to your BER plot when you increase pilot power (Ep) you performance gets bad, ex.: compare Ep=10 vs Ep=1. BER (Ep=10) must have best performance. And I think the problems is in a wrong Noise generation.

Aydar.
07 Dec 2011 OFDM LSE Channel Estimation the performance of LSE channel estimation will be evaluated based on bit error rate in received data Author: Hamid Ramezani Ramezani, Hamid

To Aydar Zimaliev,
Thanks for your comment. In practical scenarios in which the power is an important resource of the system, we should consider the overall performance of the systems. And as you know, the transmit power limit put a condition on the overall transmission power and it is not different for pilots or data. For the optimum power allocation between pilots and data please see the following paper: "On the Power Allocation and System capacity of OFDM Systems Using Superimposed Training Schemes".

However, if we consider the power allocation of pilots and data disjointly, then you'r right.

Hamid.
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wireless, ofdm, capacity, mimo, optimization
Files Tagged by Hamid View all
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Updated   File Tags Downloads
(last 30 days) 		Comments Rating
13 Jan 2012 Screenshot Two cool problems, solved by matlab codes The solution of two stochastic problems. Author: Hamid Ramezani stochastics, signal processing, mathematics, enigma 6 0
09 Dec 2011 Screenshot Single target Localization distance based localization of a single target Author: Hamid Ramezani communications, optimization, signal processing, measurement, automotive 17 0
08 Dec 2011 Screenshot Capacity Maximization in Multiuser OFDMA system The complete project of OFDMA system. It tries to maximize the network capacity. Author: Hamid Ramezani ofdm, capacity, channel, pilot, power allocation 59 0
10 Apr 2008 Screenshot Alamouti STC for MIMO System Alamouti Space Timem Coding Author: Hamid Ramezani aamouti, mimo, timem, multi antenna, m, stc 27 4
  • 3.33333
3.3 | 3 ratings
24 Mar 2008 Screenshot greedy algorithm in OFDM resource allocation (single user) the implemention of greedy algorithm in mex file Author: Hamid Ramezani greedy algorithm, resorce allocation, wireless, ofdm, optimization, mex file 38 3

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