Reflection and transmission characteristics of bianisotropic slabs with(out) a soft and hard surface: Clarification of the magnetic group of symmetry
✍ Scribed by Wen-Yan Yin; Le-Wei Li
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 190 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0895-2477
No coin nor oath required. For personal study only.
✦ Synopsis
Figure 6 Constellation diagram of SPW simulation of IrQ signal output of 64 QAM signal when the calibration coefficients are obtained from QPSK signals with the phase of the first state shifted by 30Њ. Altogether, 100 data are taken from the output of each power detector and averaged during nonideal synchronization ers of the power detectors of the six-port for QPSK signal reception. 2. This calibration method is especially suitable for QPSK signals. It has a clear physical meaning, and can be easily implemented in practical DMRs. The Q -points i
and S-parameters of the six-port junction are obtained during this calbiration procedure; this is very helpful in judging the quality of the DMR. Accurate calibration results of poor six-ports can be obtained by using this procedure, as seen by experimental results. 3. Error analysis shows that the errors caused by nonideal synchronization and errors in the standard QPSK signal states will be unimportant if proper measures are adopted in the implementation of the proposed calibration method. 4. Calculated and experimental results, including a comparison with other calibration methods, validate this proposed calibration procedure. 5. The proposed calibration method can also be used to calibrate multiple-port receivers with arbitrary port numbers.
REFERENCES 1. J. Li, R.G. Bosisio, and K. Wu, Dual-tone calibration of six-port junction and its application to the six-port direct digital millimetric Ž .