Monday, April 11, 2011

4G LTE structure

LTE PHY layer block diagram:-

We can implement LTE Physical layer Block diagram in Matlab .



Frame structure: it is FDD frame which is 10ms divided into 10 subframes each
of 1ms & each subframe is divided into 2 slots of 0.5 ms which carry 6 or 7 OFDM
symbol.




Randomizer:

    Combines user data with known synchronization frame data bits.The incoming data is first XOR-ed with the synchronized frame data generated from PN sequence generator.To prevent long sequences of ones and zeros and for synchronization.

FEC(forward error correction):

    The system uses 1/3 turbo encoder as a channel coder(with puncturing to change rate) and 24 bit CRC for error detection.

Symbol mapper:

    The system uses adaptive modulation (mapping) and the supported modulation schemes are QPSK, 16QAM and 64QAM.

0 comments :

Post a Comment

 
Design by Free WordPress Themes | Bloggerized by Lasantha - Premium Blogger Themes | Blogger Templates