Atec Agilent-E4437B - Manual (Page 11)

11
I/Q baseband generator
(Option UN8, ESG-DP and ESG-D series only)
Modulation
PSK BPSK, QPSK, OQPSK, π/4DQPSK,
8PSK, 16PSK, D8PSK
MSK User-defined phase offset from
0 to 100°
QAM 4, 16, 32, 64, 256
FSK Selectable: 2, 4, 8, 16 level
symmetric
Custom: Custom map of up to 16 deviation
levels
Deviation: Modulation index ≤1,
≤1.5 Msym/sec
Modulation index
≤0.5,
≤2.0 Msym/sec
Resolution: 0.1 Hz
I/Q: Custom map of 16 unique values
for I and Q
Filter
Selectable Nyquist, root Nyquist, Gaussian,
rectangular
α: 0 to 1, B
b
T: 0.1 to 1
Custom FIR 256 coefficients, 16-bit resolution,
16 symbols long, automatically
scaled
Symbol rate
For external data or internal PN sequences in pattern mode,
symbol rate is adjustable from 200 symbols/sec to maximum
listed in table.
Bits/symbol Maximum symbol Maximum data
rate (Msym/sec) rate (Mbits/sec)
1 12.5 12.5
2 12.5 25
3 8.33 25
4 12.5 50
5 10 50
6 8.33 50
7 7.14 50
8 6.25 50
For all other data types and data structures the maximum bit rate
is 5 Mbits/sec.
TDMA data structure
Frames and timeslots may be configured as different types of
traffic or control channels. The data field of a timeslot can accept a
user file, PRBS (PN9 or PN15), or external data. Maximum bit rate
is 5 Mbits/sec.
Reference frequency
Internal or external 1, 2, 5, 10 MHz reference
Data clock can be locked to an external 13 MHz (GSM) reference
Frame trigger delay control
Range 0 to 65,535 bits
Resolution 1 bit
Data types
Internally generated data
Pseudo-random patterns (meets ITU-T standard)
Continuous PN9 (PRBS 2
9 –1) PN11
(PRBS 2 11 –1), PN15 1
(PRBS 2 15 –1), PN20 (PRBS 2 20 –1),
PN23 (PRBS 2 23 –1).
Repeating sequence Any 4-bit sequence
Downloadable data
Maximum bit rate 5 Mbits/sec
Direct-pattern RAM (PRAM)
Max size 1 Mbytes (standard)
8 Mbytes (Option UN9)
Use Nonstandard framing
User file
Max size 128 kbytes
Use Continuous modulation or internally
generated TDMA standard
Externally generated data
Type Serial data
Inputs Data, bit/symbol clocks
Accepts data rates ±5% of
specified data rate
Internal burst shape control
Varies with standards and bit rates
Rise/fall time range
Up to 30 bits
Rise/fall delay range 0 to 63.5 bits
I/Q outputs
(Baseband I/Q outputs can be scaled from 0 to 1 V
peak-to peak
into
50 Ω) 2
Standard Default scaling Maximum V (rms)
NADC, PHS, PDC 100 0.25
TETRA 65 0.25
GSM, DECT N/A 0.35
EVM (NADC, PDC, PHS, TETRA) 3 1% rms
Global phase error (GSM) 3 0.75° rms
Deviation accuracy (DECT) 3 1 kHz rms
I/Q outputs
(Baseband I/Q outputs can be scaled from 0 to 1 V
peak-to peak
into 50
Ω) 4
Custom format 5 Default scaling Maximum V ( rms )
FSK, MSK NA 0.35
QPSK, BPSK 70 0.32
8PSK, 16PSK, D8PSK 70 0.20
π/4DQPSK 70 0.25
QAM 70 >0.10
1. PN15 is not continuous in bursted mode when TETRA is operated in a downlink mode.
2. Baseband I/Q ouputs cannot be scaled for GSM and DECT.
3. Specifications apply for the frequency range, symbol rates, root Nyquist filter, filter factors, and default scaling factor specified for each standard.
4. Baseband I/Q outputs cannot be scaled for FSK and MSK.
5. Filter factor (a or BbT) is set to 0.5.