Frame synchronization using correlation between permuted sequences
AssigneeNew Jersey Institute of Technology
InventorsMiao Shi, Yeheskel Bar-Ness
Life of this patent
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Abstract
A permuted sequences combination uses a frame structure in which two sync words, each comprising M complex symbols, are appended at the frame start. One benefit is the reduction of the large variance of the timing estimation error in the conventional correlation method. In at least one embodiment, the first sync word, s1, is a predetermined constant amplitude zero autocorrelation (CAZAC) sequence. The second sync word, s2, is a permutation of the first such that the combination of the two received sync signal vectors perform sliding window processing where the peak occurs at the correct frame start. The permuted sequences combination can be used in both AWGN channel and multi-path environments.
Claims15
A method for synchronizing a communication signal, wherein the communication signal has a frame structure and each frame of the frame structure includes at least one symbol, the method comprising:
- receiving a first synchronization word in a first sequence of a communication signal, the first synchronization word providing a reference symbol;
- and
- receiving a second synchronization word in a second sequence of the communication signal, wherein the second synchronization word is a permutation of the first synchronization word.
An apparatus for synchronizing a communication signal having a frame structure using correlations between permuted sequences, the apparatus comprising:
- a modulator that provides a first synchronization word in a first sequence of a communication signal and a second synchronization word in a second sequence of the communication signal, wherein the second synchronization word is a permutation of the first synchronization word;
- and
- a transmitter that transmits the communication signal including the first and second synchronization words.
A method of frame synchronization using permuted sequences, the method comprising:
- receiving a communication signal at a receiver, the communication signal including a frame structure with a first frame having a first communication word and a second frame having a second communication word;
- de-permuting the first communication word from the received communication signal;
- and
- performing a correlation of the first communication word and the second communication word.
Dependencies are inferred from the claim text.