EVM measurement can also be used by the system integrator to troubleshoot the design when other measurements are failing.
By maintaining only first two terms in (7) and (8) for BPSK and QPSK
detection, respectively, and using (9), one can get simple expressions, which lead to infinitive series-form evaluation of BER performance for wide range of propagation scenarios.
Figure 9 depicts the entire QPSK
and 16-QAM constellations in the complex plane, where the labels i and q stand for the real and imaginary axes, respectively.
Next, our proposed the FD of linear characteristic, MLFE based on phase domain, and the overall design of our QPSK
ADCOL are described in Section 3.
Chun, "BPSK, QPSK
, 8-PSK Demodulator for FPGA 5 pages," http://www.innovative-dsp.com/support/datasheets/IPPSK_DEMOD4.pdf.
On the contrary, QPSK
is another form of PSK which is widely used in wireless communication that uses four points on the constellation diagram, equispaced around a circle.
Pirminiai parametrai: RSCP--priimto signalo kodo galia; Ec/No--lusto gautos energijos santykis su galios tankiu visoje dazniu juostoje; SIR--signalo/ interferencijos santykis, nusako signalo galios santyki su triuksmo galia kanale; CQI--kanalo kokybes rodiklis; moduliacijos 16-QAM, QPSK
. Duomenims perduoti naudojami kodai.
In Figures 5 and 6 the bit error rate performance using QPSK
modulation, for the cases of 2- and 4-symbol overlapping, respectively, is shown.
* Conventional QPSK
has transitions through zero (i.e.
Color Modulation DL Throughput (Mbps) CINR (dB) RSSI (dBm) Red QPSK
2.03 9.18 -82.71 Green 16 QAM 3.27 11.32 -73.95 Blue 64 QAM 3.91 23.65 -51.26 Table 4.
Section 5 determines the error probability of six-port receiver from EVM when a QPSK
modulation is used.