Category Archives: Uncategorized

Taken for granted

When you are honest and sincere, you are taken for granted.It is the perpetual truth that good people has no value in this selfish world. The world is selfish , people have been busy with their own interest. It should be. But it should not have an adverse effect to the other person surrounding the victim. However, for last more than few years i had been experiencing this kind of behavior from my surrounding people. Even now i have been experiencing it.The people think they win over the victim; but not they do not indeed.The enterprise has not provided me the benefits based on my potential and contribution to the enterprise.Alas! i am taken for granted.



Hello there!. it has been a long time. I have been doing my job for more than two years. Yet i can not get rid of my obsession. i am still obsessed with my very known fact. It is as if i were into it. And it seems to be forever.


Leisure !

My all courses have been completed. Now it is leisure time. Maybe it is the best leisure of my lifetime. Nothing to do just skimming through on and off of some write-ups in the forum regarding technology in order to enhance my insight. I have changed myself a lot. Now , I hardly come outside. Actually i don’t feel like going outside. The past is killing me really. I can not get over it. Sooner or later, i have got to get over everything . In sha Allah everything will be alright. I have somewhat wrapped up everything regarding sharing of what i know. Because i have found that people never look at me as courtesy. It is not a must. Ha ha ha ha . I do not care. However, it gives me some pain when I notice that they do not care me as courtesy but whenever they need me badly they hanker after me. I always help others. Now i think maybe i am a cheap person. I do not search for help from those whom i once do not get assistance as if they veigned to deny. Despite i help my best. I am trying to change but somehow i am not successful yet. All is selfish. That’s all for now


Orthogonal Frequency Division Multiplexing(OFDM) is a multi-carrier transmission technique that has been recently recognized
as an excellent method for high-speed bi-directional wireless data communications. Fundamentally, Frequency Division
Multiplexing(FDM) uses multiples frequencies to simultaneously transmit multiple signals in parallel. While each sub-carrier is
separated by a guard band to ensure that they do not overlap in the ordinary FDM, the sub-carriers in the OFDM are squeezed
tightly together in order to reduce the required bandwidth. In fact the neighboring sub-channels are overlapped in OFDM. However,
the sub-carriers are orthogonal to each other such that there is no inter-carrier interference (ICI).
In mobile communication environment with the moving vehicle, there is a Doppler shift effect which causes each sub-channel
to be shifted and orthogonality to be broken. To prevent this phenomena, cyclic prefix to each symbol is added. The cyclic prefix
is for implementing the FFT when one needs to use circular convolution to emulate linear convolution. Instead of just sending
blank during guard time, repeating the end of the symbol provides ”guard time” (instead of the ”guard band”) to make sure all
the sub-carriers are orthogonal. If the end interferes with the next symbol, we can subtract it out because we already received the
prefix, which is the same.
There is another benefit of OFDM. Since each subcarrier of OFDM uses a narrow bandwidth, in the time domain each symbol
is transmitted during a relatively long symbol time. This guarantees all the significant multipaths arrive within a symbol time
minimizing Inter-symbol Interference(ISI). This is good news. Because it removes the need for an equalizer at a transmitter and
a receiver side, reducing complexity and the cost.

Eid Mubarak

Eid Ul azha has been celebrated on 16th October,2013 . I wish all a happy Eid

Name Description Note
IEEE 802.1 Bridging (networking) and Network Management  
IEEE 802.2 LLC inactive
IEEE 802.3 Ethernet  
IEEE 802.4 Token bus disbanded
IEEE 802.5 Defines the MAC layer for a Token Ring inactive
IEEE 802.6 MANs (DQDB) disbanded
IEEE 802.7 Broadband LAN using Coaxial Cable disbanded
IEEE 802.8 Fiber Optic TAG disbanded
IEEE 802.9 Integrated Services LAN (ISLAN or isoEthernet) disbanded
IEEE 802.10 Interoperable LAN Security disbanded
IEEE 802.11 a/b/g/n Wireless LAN (WLAN) & Mesh (Wi-Fi certification)  
IEEE 802.12 100BaseVG disbanded
IEEE 802.13 Unused[2]  
IEEE 802.14 Cable modems disbanded
IEEE 802.15 Wireless PAN  
IEEE 802.15.1 Bluetooth certification  
IEEE 802.15.2 IEEE 802.15 and IEEE 802.11 coexistence  
IEEE 802.15.3 High-Rate wireless PAN (e.g., UWB, etc)  
IEEE 802.15.4 Low-Rate wireless PAN (e.g., ZigBee, WirelessHART, MiWi, etc.)  
IEEE 802.15.5 Mesh networking for WPAN  
IEEE 802.15.6 Body area network  
IEEE 802.16 Broadband Wireless Access (WiMAX certification)  
IEEE 802.16.1 Local Multipoint Distribution Service  
IEEE 802.17 Resilient packet ring  
IEEE 802.18 Radio Regulatory TAG  
IEEE 802.19 Coexistence TAG  
IEEE 802.20 Mobile Broadband Wireless Access  
IEEE 802.21 Media Independent Handoff  
IEEE 802.22 Wireless Regional Area Network  
IEEE 802.23 Emergency Services Working Group  
IEEE 802.24 Smart Grid TAG New (November, 2012)
IEEE 802.25 Omni-Range Area Network Not yet ratified

Views from my friends

Guys! We have finally finished the formal classes and exam in the campus at Institute of Science and Technology.Maybe we will meet after a long time like this . But who knows! maybe it is so near! however, I am making this post as I feel that i need some views from my friends regarding whatever it is. Feel free to say your words regarding me both in Bengali and English. Maybe it will be a matter of reminisce after a long long time.





All the formal classes has been suspended on 25th September. Some snaps has been taken by friends and i also have taken snaps of them..

Model test exam next Saturday on 28th September


Summer vacation 2013 starts

Summer vacation starts from 7th June to 14th June. 🙂 only a few days oh.

Summer Vacation

Summer vacation starts from 7th June to 14th June. 🙂 only a few days oh.

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