Receiver parameter

AN4174

16/21

Doc ID 023728 Rev 1

reported. The measurement has been performed connecting two signal generators by a

power combiner. The first generator has been set with the modulation data reported in the

table and with PN9 as data. The level was set to be 3 dB higher than sensitivity. After that,

the second generator was powered on with an un-modulated carrier set at ±12.5 kHz or

±25 kHz from the fundamental and its level was raised until 1% of BER was reached. The

difference between the two levels was the searched value.

The ARIB STD-T67 requirement is also reported in the same table. The SPIRIT1 met the

standard requirement with margin.

4.3

Adjacent channel selectivity at effective selectivity

The adjacent channel selectivity at effective selectivity (the ratio of the jamming wave input

voltage to the encoding reference sensitivity as the output bit error rate of the device

becomes 1 x 10-2 when a jamming wave that is modulated by a signal of repetitive binary

pseudo noise with a code length of 32767 bits and is 12.5 kHz or 25 kHz distant from the

desired wave is applied to a device with channel interval of 12.5 kHz or 25 kHz, respectively,

in a state in which the desired wave input voltage 3 dB higher than the encoding reference

sensitivity is applied) is 30 dB or more.

The measurement results are reported in Table 3. Three different data rate cases are

reported. The measurement has been performed connecting two signal generators by a

power combiner. The first generator has been set with the modulation data reported in the

table and with PN9 as data. The level was set to be 3 dB higher than sensitivity. After that,

the second generator was powered on with a modulated carrier (same modulation, data

rate, frequency deviation and data of the fundamental) set at ±12.5 kHz or ±25 kHz from the

fundamental and its level was raised until 1% of BER was reached. The difference between

the two levels was the searched value.

The ARIB STD-T67 requirement is also reported in the same table. The SPIRIT1 met the

standard requirement with margin.

Table 2.

Communication method, operating frequencies and antenna power

Modulation

Data rate

[Kbps]

Deviation [kHz] Channel filter [kHz]

Spurious response [dB]

-

ΔCh

+

ΔCh

ARIB

GFSK

2.4

2.4

8.5

53

56

40

GFSK

4.8

2.4

8.5

54

52

GFSK

9.6

4.8

16

50

55

Table 3.

Communication method, operating frequencies and antenna power

Modulation

Data rate

[Kbps]

Deviation [kHz] Channel filter [kHz]

Adjacent channel

selectivity [dB]

-

ΔCh

+

ΔCh

ARIB

GFSK

2.4

2.4

8.5

55

52

30

GFSK

4.8

2.4

8.5

50

36

GFSK

9.6

4.8

16

48

45