Highly efficient iterative code multi-user detection method for OFDM system
Title:
Highly efficient iterative code multi-user detection method for OFDM system
Application Number:
200310117186
Application Date:
2003/12/05
Announcement Date:
2004/11/17
Pub. Date:
Publication Number:
1547339
Announcement Number:
Grant Date:
Granted Pub. Date:
ApplicationType:
Invention
State/Country:
11[China|beijing]
IPC:
H03M 13/00H04J 11/00
Applicant(s):
Tsinghua University
Inventor(s):
Zhou Shidong, Li Yunzhou, Yao Yan
Key Words:
iterative code, multi-user, detection method, OFDM system
Abstract:
The efficient iterative-coded multi-user detection method applied to OFDM system belongs to coded multi-user detection domain, which is characterized by that users are distinguished with interlacing pattern and that it carries on iteration between demodulation associated with multi-user and decoding with single user. At the same time, the invention proposes a fast method applied to multi-user demodulators and computing the maximum posterior possibility of code bit, in the method a measuring function is structured which takes symbolic vectors of equivalent modulated users as arguments and is applied to compute the maximum posterior possibility of code bit. The operation amount applied to compute function value of all modulating symbolic vectors will reduce by means of the function property. Finally according to the function value of all modulating symbolic vectors, compute the maximum posterior possibility of code bit of every user. When the invention enhances the spectrum efficiency and the capacity of users, it can make the operation amount of multi-user demodulator greatly decrease and is convenient to be used.
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