GC1115 Datasheet, PDF (10/80 Pages) Texas Instruments – Crest Factor Reduction Processor

GC1115
SLWS144 – FEBRUARY 2005
www.ti.com
Relevant 3GPP (W-CDMA) Requirements
The GC1115 is designed to meet the following 3GPP specifications. The Test Models used to verify these
specifications are described in 3GPP TS 25.141, Section 6.1.1 of Release 6 (2002-12).
• ACLR: At least 45 dB ACLR at 5 MHz below the first (or above the last) active W-CDMA carrier in the band,
and at least 50 dB ACLR at 10 MHz below the first (or above the last) active W-CDMA carrier in the band,
(TS 25.141, Section 6.5.2.2), using Test Model 1.
– NOTE: The GC1115 supports > 70 dB ACLR using 85-tap cancellation pulses or longer.
• EVM: ≤ 17.5% for QPSK modulation (TS 25.141, Section 6.7.1), using Test Model 4.
– NOTE: The GC1115 provides ≤ 17.5% cEVM for all Test Models with output PAR down to 6 dB.
• PCDE: ≤– 33 dB (TS 25.141, Section 6.7.2), using Test Model 3.
– NOTE: The GC1115 provides ≤ -33 PCDE for all Test Models with output PAR down to 6 dB.
• Spurious emissions: various (TS 25.141, Section 6.5.3), using Test Model 1.
Relevant cdma2000 Requirements
Ref. 3GPP2 C.S0010-A (March 30, 2001):
• Section 4.2: Modulation Requirements (Rho – waveform quality)
• Section 4.3: RF Output Power Requirements
• Section 4.4: Limitations on Emissions
SUMMARY OF GC1115 PERFORMANCE USING 3G TEST MODEL SIGNALS
3G Test Signal
TM1_64
TM1_64
TM1_64
TM3_32
TM3_32
TM3_32
# of cxrs
1
2
4
1
2
4
Table 1. 3GPP PCDE and Composite EVM Performance
8 dB
–50.7
–50.1
–49.8
–46.3
–44.5
–42.5
PCDE (Spec: < -33 dB)
7 dB
6 dB
–46.2
–41.7
–45.6
–42.2
–47.2
–43.3
–41.4
–37.1
–42.3
–38.2
–39.1
–35.6
5 dB
–38.3
–37.8
–39.8
–34.4
–36.3
–34.2
Composite EVM (Spec: < 17.5%)
8 dB
7 dB
6 dB
5 dB
3.3%
5.4%
8.5%
11.7%
3.4%
5.8%
8.7%
12.7%
3.9%
4.9%
7.6%
10.8%
3.9%
6.5%
9.7%
13.5%
4.5%
7.0%
9.3%
12.3%
7.0%
10.0%
13.2%
15.5%
Test Conditions:
a. Each simulation processed 614,400 input samples (one 10 msec frame at 61.44 Msamp/sec)
b. PCDE and composite EVM were measured using a Rohde & Schwarz FSU
c. Cancellation pulse lengths varied from 75 to 181
d. ACLR depends mostly on cancel pulse length. Cancel pulse lengths of 85 achieve –70 dB ACLR for
four-carrier UMTS signals. Cancel pulse lengths of 115 achieve –70 dB ACLR for single-carrier UMTS
signals.
e. Multi-carrier Test Model signals used frames that were staggered by 2 msec between carriers
f. Stages 1 thru 4 were assigned 4, 8, 12, and 8 cancelers, respectively (total of 32 cancelers).
g. For PAR = 7 dB, Stages 1 thru 4 used detection thresholds of 8, 7, 7, and 7 dB, respectively.
h. For PAR = 6 dB, Stages 1 thru 4 used detection thresholds of 8, 7, 6, and 6 dB, respectively.
i. For PAR = 5 dB, Stages 1 thru 4 used detection thresholds of 8, 6, 5, and 5 dB, respectively.
RESET
The GC1115 supports three kinds of reset:
1. PLL reset (only the PLLs are reset)
2. Hardware reset (all configuration registers are brought to their RESET values)
3. Datapath hardware reset
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