Symbol-energy-to-noise-density estimation in a QPSK modulated co

Details Symbol-energy-to-noise-density estimation in a QPSK modulated co Symbol-energy-to-noise-density estimation in a QPSK modulated co

1997-09-17

2000-06-13

Ghebretinsae, Temesghen

Pulse or digital communications

Testing

Signal noise

4552263, H04B 1700

Patent

active

060758155

ABSTRACT:
The process determines the I channel and Q channel components for each received soft value. The location of each soft value with respect to the fade line is determined using the I and Q channel components. These locations are averaged over a power control group duration to determine the noise density. The symbol energy is determined by subtracting the average perpendicular distance from the soft value point to the fade line from half the square of the average of the distance from the soft value point to the origin.

REFERENCES:
patent: 4985900 (1991-01-01), Rhind et al.
patent: 5383219 (1995-01-01), Wheatley, III et al.
patent: 5461639 (1995-10-01), Wheatley, III et al.
patent: 5603096 (1997-02-01), Gilhousen et al.
patent: 5604780 (1997-02-01), Tiedemann
patent: 5719898 (1998-02-01), Davidovici et al.

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