Title:
DIRECT SPREADING CDMA TRANSMISSION SYSTEM RECEIVER
Document Type and Number:
Japanese Patent JP3228405
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide RAKE reception without requiring an RAKE synthetic (common-mode synthesization) multi-path search function in a CDMA transmission system.
SOLUTION: A received signal is reversely spreaded by a matched filter 101 and a correlative detection value is outputted at every chip. The channels of respective multi-path signals separated at every chip cycle are estimated through the use of a pilot symbol at every multi-path by a channel estimating and compensating part 110. A matched filter output is inputted to respective average signal power measuring part 120 so as to generate an average delay profile. A threshold deciding part 140 decides the threshold of signal power for executing RAKE synthesization as against the max. signal power of the average delay profile. A synthetic path selecting part 150 selects the multi-path of signal power with the higher threshold and the channel estimating/ compensating part output of the selected multi-path is synthesized by a RAKE synthesizer 160.
Inventors:
Akira Fukumoto
Mamoru Sawahashi
Fumiyuki Adachi
Mamoru Sawahashi
Fumiyuki Adachi
Application Number:
JP34602596A
Publication Date:
November 12, 2001
Filing Date:
December 25, 1996
Export Citation:
Assignee:
NTT DoCoMo, Inc.
International Classes:
H04B1/707; H04B1/712; (IPC1-7): H04B1/707
Domestic Patent References:
| JP88877A | ||||
| JP8116303A | ||||
| JP1051354A | ||||
| JP9321667A | ||||
| JP10173626A | ||||
| JP8335899A | ||||
| JP8191285A |
Other References:
ＩＥＩＣＥ ＴＲＡＮＳ．ＣＯＭＭＵＮ．，ＶＯＬ．Ｅ７９−Ｂ，ＮＯ．９，（１９９６−９），Ｐ．１３１６−１３２５
Attorney, Agent or Firm:
Yoshikazu Tani (1 person outside)