JOINT BLIND SYNCHRONIZATION OF M-PSK AND M-QAM SIGNALS

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Authors
  1. Kozminchuk, B.
  2. Huang, X.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
An algorithm has been developed that blindly synchronizes to M-PSK and M-QAM signals in the presence of timing and carrier frequency offsets. Some simplifications of the synchronization problem have been made so that this algorithm could be characterized independently of several variables. First, it is assumed that the signal's nominal symbol rate and pulse shape are known. Second, the sampling rate at the receiver is assumed to be an integer multiple of the symbol rate. Third, an ideal channel is assumed in the sense that multipath effects have not been considered. This implies that channel equalization is not required at the receiver. These more complicated issues will be dealt with in other reports. The algorithm is based on minimizing an objective function which is sensitive to the delay and frequency offsets. Using two one-dimensional searches in the delay-frequency plane, the algorithm attempts to find the optimum values which maximize the objective function. The results indicate that the technique works well but that improvements can be made, particularly in how the search portion is implemented. Furthermore, this algorithm is geared towards an environment not requiring much signal equalization. TRUNCATED
Keywords
Blind synchronization;Digital communication
Report Number
DREO-TN-96-004 — Technical Note
Date of publication
01 Oct 1996
Number of Pages
34
DSTKIM No
97-00613
CANDIS No
500744
Format(s):
Hardcopy;Document Image stored on Optical Disk

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