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CROSS-PRODUCT DETECTION METHOD FOR A NARROWBAND SIGNAL UNDER A WIDE RANGE OF CARRIER FREQUENCY OFFSET (CFO) USING MULTIPLE FREQUENCY BINS
CROSS-PRODUCT DETECTION METHOD FOR A NARROWBAND SIGNAL UNDER A WIDE RANGE OF CARRIER FREQUENCY OFFSET (CFO) USING MULTIPLE FREQUENCY BINS
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机译:使用多个频率箱的多种载波频率偏移(CFO)下窄带信号的横向产品检测方法
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摘要
A synchronizer generates cross-products of In-phase (I) and Quadrature (Q) samples and stores the sign bits for the sine and cosine cross-products. The sign bits are compared to a local reference of a frame-start bit-sequence and the compare results accumulated as I and Q correlations for symbol and half-symbol sampling. Linear combinations of the accumulated I and Q correlations for the symbol and half-symbol sampling generate linear combination results for frequency bins that peak at a different implied Carrier Frequency Offset (CFO) settings. The maximum of the linear combination results is selected and the implied CFO setting for that frequency bin is applied to a demodulator to adjust the receiver's CFO setting and bit synchronization. Computational complexity is reduced since only the sign bit of each cross-product is retained for correlation with the frame-start bit-sequence. Linear combinations can support a wide CFO range.
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