Reverse-spread spectrum device, time sequence inspection device, channel evaluation device and method for measuring frequency faults


Application Number: 00109446
Application Date: 2000.06.23
Publication Number: 1279545
Publication Date: 2001.01.10
Priority Information: 1999/6/23 JP 177098/1999; 1999/11/4 JP 313900/199
International: H04J13/02;H04Q7/32
Applicant(s) Name: NEC Corp.
Address:
Inventor(s) Name: Okugama Toshiguki;Onishi Osamu
Patent Agency Code: 11219
Patent Agent: mu dejun
Abstract A reverse spreading device is provided, in which 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. since the phase error is corrected before generating the complex symbol, a lock range of the frequency offset in the AFC can be extended.