Patent ID: 6289038
Filing Date: 2001-09-11
Classification: H04B,H04L

Abstract:
A receiver of a parallel hopping hybrid direct sequence/slow frequency hopping code division multiple access system comprising:(a) a high frequency receiving unit changing the received signal into baseband signal;(b) a direct sequence (DS) despreader despreading bandwidth by multiplying said baseband signal by pseudo-random noise (PN) sequence, said PN sequence being same with that in a transmitter, said baseband signal being changed by said high frequency receiving unit;(c) a plurality of gate function generators selecting the specific sub-band by switching on/off the signal per each sub-band, said plurality of gate function generators are same with that in said transmitter, the signal being despread by said direct sequence (DS) despreader;(d) a plurality of frequency dehopping apparatus performing frequency dehopping to the original frequency band by multiplying signals per sub-band by hopping frequency, said hopping frequency is same with that in said transmitter, said signals being selected by said plurality of gate function generators;(e) apparatus for integrate-and-dump detection calculating the correlation value by integrating the signal, which is by said plurality of frequency dehopping apparatus, during data transmission time; (f) a diversity combiner combining the signals, which are integrate-and-dump detected by said apparatus for integrate-and-dump detection, with weight values per each branch; and(g) a decision device estimating the initially transmitted signal from the diversity combined values.