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Design Notes
LTE TDD Uplink User Equipment TX Test Bench
This example demonstrates:
LTE TDD Uplink TX, compliant with 3GPP specifications.
Specification document: TS 36.104, TS 36.211, TS 36.212
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Configurable options include:
- NFramesSweep: number of 10ms frames used in each
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- sweep
- FrameType: frame type and cycling preffix:
- 0: Frame structure type 1 / Normal CP: FDD
- 1: Frame structure type 2 / Normal CP: TDD
- 2: Frame structure type 1 / Extended CP: FDD
- 3: Frame structure type 2 / Extended CP: TDD
- Carrier Frequency (MHz)
- TxOutLvlStart, TxOutLvlSpan, TxOutLvlStep (dBm): Define swept power of transmitted
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- signal
- N_RB_UL: number or resource blocks used for
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- transmission
- State of each uplink PUSCH channel (up to four users currently supported, more users may be easily added)
- N_RB_Channel: number or resource blocks used by each
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- user
- ModType_Channel: modulation type used by each user (QPSK, 16QAM, 64QAM)
- UL_DL_Config: Uplink/Downlink Configuration for TDD (0, 1, 2, 3, 4, 5 or 6)
- PTS_Format: Pilot Time Slot Format for TDD (0, 1, 2, 3, 4, 5, 6, 7 or 8)
The test bench can be used to monitor:
- The CCDF at the input and output of DUT.
- The TX signal spectrum at the input and output of
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- DUT
- EVM %rms vs. output
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- power
- The impact of phase noise on
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- EVM
- The impact of phase/amplitude and DC offset on EVM
- ACPR
N_RB_UL defines the channel bandwith as defined in the specifications (See Global Definitions for relationship between N_RB_UL and channel BW).
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System Diagram - LTE UL
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Graph - ACPR
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Graph - EVM
DB(EVM(VSA.EVM,1,1,1,12,1,0,1,0,1,1,10,0,0,0,0,0)) (us) LTE UL Time | DB(EVM(VSA.EVM,1,1,1,12,1,0,1,0,1,1,10,0,0,0,0,0)) LTE UL |
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3140.78 | -33.3395 |
Graph - Power Levels
x Data (Unitless) | DB(PWR_MTR(TP.DUT_in,1,0,1,0,0,1,0,1,0,0,1000,0,10,0,-1,0,-1,0,0.5,0,0,0))[x] (dBm) LTE UL | DB(PWR_MTR(TP.DUT_out,1,0,1,0,0,1,0,1,0,0,1000,0,10,0,-1,0,-1,0,0.5,0,0,0))[x] (dBm) LTE UL | DB(PWR_MTR(S1\S1\TP.ModOut1,1,0,1,0,0,1,0,1,0,0,1000,0,10,0,-1,0,-1,0,0.5,0,0,0))[x] (dBm) LTE UL | DB(PWR_MTR(S1\S1\TP.ModOut2,1,0,1,0,0,1,0,1,0,0,1000,0,10,0,-1,0,-1,0,0.5,0,0,0))[x] (dBm) LTE UL |
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0 | -8.80876 | 2.99405 | ||
1 | -7.80876 | 3.99401 | ||
2 | -6.80876 | 4.99338 | ||
3 | -5.80876 | 5.98986 | ||
4 | -6.7403 | 5.06514 | ||
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Graph - EVM vs Output Power
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