Title:
A DEMODULATION METHOD FOR DOWNLINK RECEIVED SIGNAL IN CDMA
Document Type and Number:
WIPO Patent Application WO/2008/014631
Kind Code:
A1
Abstract:
A demodulation method for downlink received signal in CDMA, including the following
steps: multipath searching the received baseband digital I/Q signal, channel
estimating the searched L pieces of effective multipath to obtain the column
vector of the channel estimation value (110); the 3 pieces of paths respectively
called a strong-path, a week-path, a dummy-path which the weak-path is related
to the strong-path are assigned (120), if L is equal to 2 and the Signal-To-Noise
ratio is larger than the threshold predetermined; multipath de-scrambling
and despreading the paths assigned to obtain a despreading column vector for
a target symbol (130); one of the interfering item of the strong-path is replaced
by the dispreading result multiplied by a coefficient, so that the despreading
result of the strong-path updated is obtained (140); the old despreading result
is replaced by the strong-path despreading result updated for maximal ratio
combining to obtain demodulated target symbol (150). The present method operates
simply and can achieve better performance than Rake receiver, when the number
of paths is 2 and the Signal-To-Noise ratio is relatively large, and the interference
in cellular presents on main situation.
Inventors:
CHEN GUAN (CN)
Application Number:
PCT/CN2006/001493
Publication Date:
February 07, 2008
Filing Date:
June 29, 2006
Export Citation:
Assignee:
ZTE CORP (CN)
CHEN GUAN (CN)
CHEN GUAN (CN)
International Classes:
H04B1/707
Foreign References:
| CN1411191A | 2003-04-16 | |||
| CN1471252A | 2004-01-28 | |||
| US20060072651A1 | 2006-04-06 | |||
| US20030202568A1 | 2003-10-30 |
Attorney, Agent or Firm:
AFD CHINA INTELLECTUAL PROPERTY LAW OFFICE (8 Xueqing Rd Haidian District, Beijing 5, CN)
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