Communication quality estimation method, communication quality estimation apparatus, and communication system
US7130587B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 22, 2002 |
| Grant date | Oct 31, 2006 |
| Priority date | — |
| Expiry date | Feb 12, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/18
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An average signal point amplitude detection section 15A determines an average position of I and Q components when a received QPSK modulated signal is demodulated and a threshold calculation section 15B determines threshold ths on an IQ plane based on the average signal point position of the received QPSK modulated signal and a theoretical distribution position on the IQ plane of signal points of a 16-value QAM signal. Then, a threshold decision section 14A makes a threshold-decision on the I and Q components of sequentially received QPSK modulated signals using this threshold ths and thereby calculates a simulated bit error rate of the 16-value QAM signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.