Fast hadamard transform within a code division, multiple access communication system
AssigneeMotorola, Inc.
InventorsJeffrey H. Moy, Terry M. Schaffner
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Abstract
In a receiver (10) of a code division multiple access system, a method of processing a received signal including reading a first and second data item from a first memory (50), at least one of the first and second data items associated with Walsh data; performing a first arithmetic operation on the first and second data items to produce a first result; performing a second arithmetic operation on the first and second data items to produce a second result; and storing the first and second result into a second memory (52) while reading a third and fourth data item from the first memory (50).
Claims5
An apparatus for performing a Hadamard transform on a received signal within in a code division multiple access communication system, the apparatus comprising:
- at most three latches wherein a first latch and a second latch have a common input and the first latch has an output coupled to a third latch;
- at most two summing circuits, wherein a first and a second summing circuit have inputs from the second and the third latch
- a first and a second memory device having inputs from the at most two summing circuits;
- and
- a first multiplexer having inputs from the first and the second memory devices.
Dependencies are inferred from the claim text.