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



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