CMX7163 QAM Modem
CMX7163
Figure 11 FI Loading from Serial Memory..................................................................................... 24
Figure 12 Host Tx Data Flow (No Tx Sequence/Carrier Sense)................................................... 30
Figure 13 Host Rx Data Flow........................................................................................................ 31
Figure 14 Carrier Sense................................................................................................................ 33
Figure 15 Transmit Sequence....................................................................................................... 34
Figure 16 CMX998 DC Calibration Interfaces............................................................................... 35
Figure 17 Transmit Constellation .................................................................................................. 38
Figure 18 Constellation Diagram – no frequency or phase error .................................................. 38
Figure 19 Constellation Diagram – phase error ............................................................................ 38
Figure 20 Constellation Diagram –frequency error ....................................................................... 38
Figure 21 Sample at symbol timing with I/Q dc offset diagnostic mode (no frequency error)....... 39
Figure 22 Sample at symbol timing with I/Q dc offset diagnostic mode (with frequency error) .... 39
Figure 23 Normalised Constellation (even with a frequency or phase error) ................................ 40
Figure 24 Normalised Constellation (noisy received signal) ......................................................... 40
Figure 25 Command and Rx Data FIFOs ..................................................................................... 41
Figure 26 AGC using SPI Thru-Port.............................................................................................. 46
Figure 27 AGC Behaviour During Burst Reception....................................................................... 47
Figure 28 Main Clock Generation ................................................................................................. 48
Figure 29 Digital System Clock Generation Schemes .................................................................. 49
Figure 30 QAM Mappings ............................................................................................................. 52
Figure 31 Outline Radio Design (I/Q in/out for QAM).................................................................... 53
Figure 32 Suggested Frame Structures........................................................................................ 54
Figure 33 Received 4 and 16-QAM signals, no equalisation ........................................................ 56
Figure 34 Received 4 and 16-QAM signals with equalisation....................................................... 56
Figure 35 Tx Spectrum and Modulation Measurement Configuration for I/Q Operation............... 57
Figure 36 Tx Modulation Spectra (4-QAM), 18ksymbols/sec I/Q Modulation into CMX998 ......... 58
Figure 37 Tx Modulation Spectra (16-QAM), 18ksymbols/sec I/Q Modulation into CMX998 ....... 59
Figure 38 Tx Modulation Spectra (64-QAM), 18ksymbols/sec I/Q Modulation into CMX998 ....... 60
Figure 39 Tx Modulation Spectra (16-QAM), 9k symbols/sec I/Q Modulation into CMX998 ........ 61
Figure 40 Modem Sensitivity Performance ................................................................................... 62
Figure 41 Modem Co-Channel Rejection with FM Interferer (as EN 300 113) ............................. 63
Figure 42 4-QAM Performance with Different Coding Schemes .................................................. 63
Figure 43 16-QAM Performance with Different Coding Schemes ................................................ 64
Figure 44 64-QAM Performance with Different Coding Schemes ................................................ 64
Figure 45 Comparison of BER and PER for 4-QAM Modulation................................................... 65
Figure 46 Comparison of BER and PER for 16-QAM Modulation................................................. 66
Figure 47 Comparison of BER and PER for 64-QAM Modulation................................................. 66
Figure 48 4-QAM Signal to Noise Performance, Equalised and Not Equalised............................ 68
Figure 49 16-QAM Signal to Noise Performance, Equalised and Not Equalised.......................... 68
Figure 50 64-QAM Signal to Noise Performance, Equalised........................................................ 69
Figure 51 Performance of 16-QAM equalised signals with temperature variation........................ 70
Figure 52 Performance of 64-QAM equalised signals with temperature variation....................... 70
Figure 53 C-BUS Timing............................................................................................................... 79
Figure 54 Mechanical Outline of 64-pin VQFN (Q1) ..................................................................... 80
Figure 55 Mechanical Outline of 64-pin LQFP (L9)....................................................................... 80
Information in this data sheet should not be relied upon for final product design. It is always recommended
that you check for the latest product datasheet version from the CML website: [www.cmlmicro.com].
2014 CML Microsystems Plc
Page 5
D/7163_FI-4.x/12
CMLMICRO [ CML MICROCIRCUITS ]
