Title:
A METHOD OF ADAPTIVE 8PSK DEMODULATION IN EDGE SYSTEM
Document Type and Number:
WIPO Patent Application WO/2007/076638
Kind Code:
A1
Abstract:
A method of adaptive 8PSK demodulation in EDGE system includes: a signal reversal
module reverses the received I and Q signals of multi-times sampling rate; a channel
parameter estimate module performs sliding relative to the reversed signal
and obtains the channel parameter estimating value under the multi-times sampling
rate; performing associated estimate according to the estimating value of the
channel parameter, and determining the time preact of the signal and the actual
dispersion length of the channel simultaneously by rough synchronization and
accurate synchronization; performing synchronization and down sampling to
the reversed signal; performing whitening matched filter to the synchronized
and down sampled signal; performing 8PSK demodulation adaptively by the way
of reduced state according to the predetermined rules. The method of the invention
improves the performance of Base Band system when the actual dispersion length
of the channel is smaller and ensures to keep the performance of Base Band system
unchangeable when the dispersion length of the channel is bigger in the premise
of satisfying the EDGE protocol specifications.
Inventors:
XIONG GANG (CN)
Application Number:
PCT/CN2005/002438
Publication Date:
July 12, 2007
Filing Date:
December 31, 2005
Export Citation:
Assignee:
ZTE CORP (CN)
XIONG GANG (CN)
XIONG GANG (CN)
International Classes:
H04L27/18; H04L27/32; G06F11/10; H04Q7/20
Foreign References:
| CN1142689C | 2004-03-17 | |||
| US5644603A | 1997-07-01 |
Other References:
JIN X.: "8PSK technology in EDGE", TELECOMMUNICATION FAST REPORT, no. 4, April 2005 (2005-04-01), pages 41 - 42
Attorney, Agent or Firm:
CHINA SINDA INTELLECTUAL PROPERTY LTD. (Focus Place 19 Financial Street, Beijing 2, CN)
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