Communication quality estimation method, communication quality estimation apparatus, and communication system
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United States of America Patent
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Oct 31, 2006
Grant Date -
Apr 7, 2005
app pub date -
Aug 22, 2002
filing date -
Aug 22, 2001
priority date (Note) -
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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.
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