Quantizer responsive to noise level for a wireless...

Details Quantizer responsive to noise level for a wireless... Quantizer responsive to noise level for a wireless...

2007-11-13

2007-11-13

Young, Brian (Department: 2819)

Coded data generation or conversion

Quantizer

Reexamination Certificate

active

11438999

ABSTRACT:
A quantizer has a plurality of decision blocks, each coupled from input to output, where each decision blocks output generates a binary value that is an unchanged decision block input if the decision block input is below the threshold input level divided by a power of 2, or the decision block subtracts a threshold divided by the power of 2 and passes this result as the decision block output. The quantizer output is formed from the bits of each comparison from each decision block. The threshold is developed from a channel noise variance which may be multiplied by a scale factor related to coding type and rate. In this manner, a large number of input bits to be quantized may be converted to a smaller number of quantizer output bits, while preserving the dynamic range information required to correctly decode signals passed through a communications channel having multi-path frequency selective fading.

REFERENCES:
patent: 6894632 (2005-05-01), Robinson
patent: 2003/0067976 (2003-04-01), Igarashi

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