Reverse spreading device, timing detecting device, channel...

Details Reverse spreading device, timing detecting device, channel... Reverse spreading device, timing detecting device, channel...

2008-01-01

2008-01-01

Lugo, David B. (Department: 2611)

Pulse or digital communications

Receivers

Automatic frequency control

C375S147000

Reexamination Certificate

active

07315590

ABSTRACT:
A reverse spreading device is provided which is capable of performing timing detection and channel estimation even in a large frequency offset environment without great increases in its circuit scale and its power consumption and of expanding a range being within the AFC (Automatic Frequency Control) for the frequency offset. A multiplication is made by multipliers between complex base band signals and spread codes and then resulting n-pieces of multiplied values are integrated by m-pieces of adders for every k-pieces of multiplied values to produce m-pieces of complex intermediate signals before obtaining complex symbols. A probability of correct synchronization is increased by providing a frequency offset to m-pieces of complex intermediate signals using phase rotators to compensate for rotation within one symbol period and to obtain a great spreading gain. A range being within the AFC for the frequency offset is expanded since a phase error is corrected before a production of the complex symbol signals.

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An Office Action issued by the Japaense Patent Office on Apr. 3, 2002.

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