CC2431ZRTCR datasheet(8/16 Pages) TAOS

Part #	CC2431ZRTCR

Description	System-on-Chip for 2.4 GHz ZigBee/ IEEE 802.15.4 with Location Engine

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CC2431

Table 2: n parameter lookup table

n index

n

n index

n

0

1.000

16

3.375

1

1.250

17

3.500

2

1.500

18

3.625

3

1.750

19

3.750

4

1.875

20

3.875

5

2.000

21

4.000

6

2.125

22

4.125

7

2.250

23

4.250

8

2.375

24

4.375

9

2.500

25

4.500

10

2.625

26

4.625

11

2.750

27

5.000

12

2.875

28

5.500

13

3.000

29

6.000

14

3.125

30

7.000

15

3.250

31

8.000

The parameter n is written to the Location

Engine as an integer index in the range [0, 31]

as the index is given as an integer value with

no fractional bits, e.g. the value n = 7 is loaded

as 00000111. The typical value for n depends

on the environment.

2.1.2.1.3 Parameter Estimation

The parameters A and n can be estimated

empirically by collecting RSSI data (and

therefore

path

loss

data)

for

which

the

distances

between

the

transmitting

and

receiving devices are known. Figure 2 is a

scatter plot of abs(RSSI) data versus log

distance in meters. A least-squares best-fit line

is used to glean the specific values of A and n

for the environment in which the data were

measured:

•

A is the y-intercept of the line, and

•

n is the slope of the line

The data in Figure 2 give A=42.4 and n=2.98

for that environment. Note that the plot in this

example does not show the actual y-intercept

i.e. the point on the line where x=0.

The value of A loaded into the engine in this

case would by 42.5. The value of n loaded into

the engine, is seen to be 13 from Table 2.

CC2431 Data Sheet (Rev. 2.01) SWRS034B

Page 8 of 15

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