Parallel hopping hybrid direct sequence/slow frequency hopping CDMA system
AssigneeSamsung Electronics Co., Ltd.
InventorChan-bum Park
Life of this patent
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Abstract
A radio system is disclosed for supporting a greater number of users than can be supported in a conventional CDMA system that supports multiple users. The radio system is a hybrid system combining elements of conventional spread spectrum techniques. The system may be defined as a parallel hopping hybrid direct sequence (DS)/slow frequency hopping (SFH) code division multiple access (CDMA) system in combination with a DS/CDMA system, frequency hopping (FH)/CDMA system and a multi-carrier system.
Claims8
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;
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- (g) a decision device estimating the initially transmitted signal from the diversity combined values.
Dependencies are inferred from the claim text.