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244 Chapter 23
CMMB Measurement Application
N6158A, CMMB Measurements Application
Description Specifications Supplemental Information
Modulation Analysis
Measurement
I/Q Measured Polar Graph Constellation (-1538 to 1538
subcarriers)
EVM, MER, Mag Error, Phase
Error RMS, Peak (Subcarrier
position), Freq Error
I/Q Error (Quad View) MER vs. Subcarriers
(-1538 to 1538 subcarriers)
Logical Channel Information
Constellation
EVM, MER, Mag Error, Phase
Error RMS, Peak (Subcarrier
position)
Quadrature Error
Amplitude Imbalance
Timing Skew
Logical Channel Information
(LCH, Range, Modulation Format,
Reed Solomon Codes, LDPC Rate,
Interleaving Mode, Scrambling
Mode)
LCH: CLCH, SLCH(0 to N) N≤38
Range: 0 (CLCH), M~N (SLCHx),
1≤M<N≤39
Mod Format: BPSK, QPSK,
16QAM
Reed Solomon Codes: (240, 240),
(240,224), (240,192), (240,176)
LDPC: 1/2, 3/4
Interleaving Mode: Mode 1/2/3
Scrambling: Mode0~7
Channel Frequency Response Amplitude vs. Subcarriers
(-1538 to 1538 subcarriers)
Phase vs. Subcarriers
(-1538 to 1538 subcarriers)
Group Delay vs. Subcarriers
(-1538 to 1537 subcarriers)