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Hi,
What do you mean by elimination of pilot carriers? Pilot symbols are inserted at the transmitter and used at the receiver for channel estimation. Can you elaborate on your question?
Re: channel estimation in ofdm
Hi,
check out the following book.
MIMO-OFDM WIRELESS COMMUNICATIONS WITH MATLAB by Yong Soo Cho, Jaekwon Kim, Won Young Yang, Chung G. Kang.
It has some matlab code that shows how to insert pilot symbols and do channel estimation using LMS and MSE and channel...
Hi,
If you go to google and search under "least mean square" you can get a lot of information and some video lectures on youtube for LMS and MSE.
Also, the following book has an entire chapter on channel estimation using LMS and MSE with some matlab code for these two algorithms. I used them...
That is correct. After subcarrier mapping, you need to pad with zeros, top and bottom to match it to the FFT size. I am not sure what you mean by guard band in this context. Do you mean cyclic prefix which is added to the OFDM symbol to mitigate the effect of ISI. If it is the case, cyclic...
Check the following books for LTE performance. These are available on the Internet for free.
"Understanding LTE and its Performance" by Tara Ali-Yahiya
"LTE Signaling, troubleshooting, and Optimization" by Ralf Kreher and Karsten Gaenger
There is a chapter on performance (by Tektronix...
Check out this book "MIMO-OFDM Wireless Communications with MATLAB", by Yong Soo Cho, Jaekwon Kim, Won Young Yang, and Chung G. Kang. There is a pdf version on the Internet.
It means that the complex valued modulation symbols obtained as a result of the modulation scheme block (QPSK< 16-QAM, or 64-QAM) are mapped to resource elements in the 2D time-frequency resource grid. Suppose that the UE is assigned 1 resource block for transmission. That is 12 resource...
Hi,
You can download some matlab code for OFDM from mathworks.com
https://www.mathworks.com/matlabcentral/fileexchange/25599-ofdm-trasnmitter-and-receiver-matlab-code/content/OFDM.m
Hi,
Do you mean the performance verification of LTE compared to UMTS? This is huge. There is a chapter in a book that addresses LTE performance verification with different traffic models. There is also a sub chapter for "System simulations scenarios and parameters". The book is "LTE for 4G...
Hi,
There is a book called "MIMO OFDM Wireless Communications with MATLAB" by Yong Soo Cho, Jaekwon Kim, Won Young Yang, and Chung G. Kang. There is a free PDF version on the net. I haven't used it so I am not sure it addresses resource allocation for OFDM but I guess it's worth checking it out.
Hi,
Thanks for your reply. The size of symbols to be fed to the decoder has to match the size of the encoded bits at the transmitter. Here is what I mean.
At the transmitter side, suppose the data block to be encoded is of length 64 bits. Applying a turbo coder with rate 1/3, the size of the...
Hi,
I am implementing an OFDM modulation scheme as part of an LTE project in C/C++ and then testing it on a DSP board. I am using turbo coding with soft decision decoding. On the receiver side of the LTE system, I need to perform a soft demodulation (16-QAM and 64-QAM) so I can feed real values...
Hi all,
Part of an advanced graduate project, I have implemented LTE uplink physical layer processing blocks (CRC, turbo coding, scrambling, modulation, etc..) for both transmitter and receiver using C/C++. Now I want to verify it on a DSP board. I am thinking TMS320C6713. The reason for...
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