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This paper proposes an effective method, based on the concept of phase cancellation and filtering, to suppress interference containing multiple linear frequency modulated (LFM) sinusoidal components for direct sequence spread spectrum (DSSS) communications. Since the recently reported Lv distribution (LVD) provides a better concentration of signal energy in the domain of frequency and chirp rate,...
The performance of traditional interference excision methods based on the discrete Fourier transform (DFT) in direct sequence spread spectrum (DS-SS) systems varies significantly with the frequency of the interference because the DFT of the interference becomes more dispersive with the increase of grid biases in the DFT operation. This paper presents a new excision method using modified DFT (MDFT)...
The performance of traditional interference excision method based on the discrete Fourier transform (DFT) in direct sequence spread spectrum (DS-SS) system varies significantly with the frequency of the interference due to the grid biases of the DFT operation. This paper presents a new excision method by using modified DFT (MDFT) with an extra parameter to enhance the BER performance for a large range...
Successive interference cancellation (SIC) multiuser detector is one of the computationally efficient sub-optimal multiuser detection methods, this paper attempts to apply the multi-stage SIC concept to full rate non-orthogonal space-time block coded (NOSTBC) multiple-input multiple-output (MIMO) systems. With 4 transmitting antennas and p, where p =1, 2, 3 and 4, receiving antennas, the multi-stage...
This paper presents the application of the discrete chirp Fourier transform for interference excision in DS-SS systems. Detailed analysis on the undesirable influence of side-lobes due to windowing operation is provided through both theoretical deviation and experimental results. A new efficient excision method is proposed by using modified DCFT to minimize the distortion from the side-lobes. With...
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