Complex constellation point multiplier

Details Complex constellation point multiplier Complex constellation point multiplier

1997-02-24

1998-09-01

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

36475403, 455550, H04K 2700, G06F 752

Patent

active

058021116

ABSTRACT:
A complex constellation point multiplier (600) multiplies a complex number by a point in a digital modulation constellation. The desired constellation point is mapped to a digital control word. The complex number is connected to multiplicand input nodes (610, 615) and the digital control word is connected to control input nodes (620, 623, 626). Via logic gates (602, 603, 605, 606, 607, 609), the control word controls switches (651-658) and simple arithmetic blocks, such as accumulators (650, 659), scaler blocks (663, 665), and negation blocks (643, 646), to generate an output complex number that is the product of the input complex number and the constellation point. This complex constellation point multiplier provides a lower size and lower power-consumption alternative to traditional complex number multipliers.

REFERENCES:
patent: 3926367 (1975-12-01), Bond et al.
patent: 4896287 (1990-01-01), O'Donnell et al.
patent: 5365549 (1994-11-01), Kazecki

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