LTE Throughput Calculation

From the 3gpp specification:

1 Radio Frame = 10 Sub-frame

1 Sub-frame = 2 Time-slots

1 Time-slot = 0.5 ms (i.e1 Sub-frame = 1 ms)

1 Time-slot = 7 Modulation Symbols (when normal CP length is used)

1 Modulation Symbols = 6 bits; if 64 QAM is used as modulation scheme

Radio resource is managed in LTE as resource grid…..

1 Resource Block (RB) = 12 Sub-carriers

Assume 20 MHz channel bandwidth (100 RBs), normal CP

Therefore,

number of bits in a sub-frame  = 100RBs x 12 sub-carriers x 2 slots x 7 modulation symbols x 6 bits
                                         = 100800 bits

Hence, data rate = 100800  bits / 1 ms = 100.8 Mbps

•  If 4x4 MIMO is used, then the peak data rate would be 4 x 100.8 Mbps = 403 Mbps.
•  If 3/4 coding is used to protect the data, we still get 0.75 x 403 Mbps = 302 Mbps as data rate.