LTE uplink feedback MCS (calculation of MCS, modulation order, encoding rate, spectral efficiency relationship table)

Source: Internet
Author: User


calculation of MCS, modulation order, encoding rate, spectral efficiency relationship table

Reference URL: http://4g-lte-world.blogspot.tw/2012/12/transport-block-size-code-rate-protocol.html

Reference URL: http://blog.richliu.com/2013/10/22/1545/

(1) Premises:

Therefore, the efficiency can be simplified to the following formula:


tbs= size of the transfer block (table 7.1.7.2.1-1)

crc= the number of bits that are attached for error checking =24

Re= the number of resource elaments to the Pdsch or Pusch channel (think of all re, 90% for shared channels)

Bits per re= modulation order

(2) Example

If ENB assigns the Pusch transmission according to CQI: MCS index=20,2 a RB. Then there are:

1) Table 7.1.7.1-1,tbs index=18

2) Table 7.1.7.2.1-1 calculate TBS (transfer block size, unit bits)


3) Calculate Code rate

Bits per re= modulation order = (MCS index=20) 6-Step =6

4) Calculation efficiency

(3)

Calculate RB Number = 12 o'clock, MCS

Correspondence Table

MCS Index

Modulation

Code ratex1024

Efficiency

0

Qpsk

99.329806

0.194003527

1

Qpsk

126.4197531

0.24691358

2

Qpsk

153.5097002

0.299823633

3

Qpsk

198.659612

0.388007055

4

Qpsk

243.8095238

0.476190476

5

Qpsk

297.989418

0.582010582

6

Qpsk

352.1693122

0.687830688

7

Qpsk

424.4091711

0.828924162

8

Qpsk

478.5890653

0.934744268

9

Qpsk

532.7689594

1.040564374

10

16QAM

266.3844797

1.040564374

11

16QAM

297.989418

1.164021164

12

16QAM

343.1393298

1.340388007

13

16QAM

388.2892416

1.51675485

14

16QAM

442.4691358

1.728395062

15

16QAM

496.64903

1.940035273

16

16QAM

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