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In this paper, we present a practical Dirty Paper Coding (DPC) scheme using sum codes based on LDPC codes. While a typical sum-code-based DPC scheme uses a constrained decoder as part of the encoding operation, such an approach fails in the case of LDPC codes since the constrained decoder based on a standard LDPC decoder tends to get stuck at highly suboptimal points in typical scenarios. We get around...
While the information theoretic result commonly referred to as “dirty paper coding” [1] has been known for long, it has not led to practical schemes that can be implemented easily in real-life communication systems. In this paper, we present the concept of sum codes and show how they provide a convenient platform for dirty paper coding. Comb-combined sum codes, which provide a convenient method of...
Although the information theoretic result referred to as “dirty paper coding” [1] has been known for quite a while, it has not led to schemes that look attractive enough for real-life communication systems. In a companion paper [2], we presented the concept of sum codes and showed how they provide a convenient platform for interference suppression via dirty paper coding. In this paper, we present...
Spectrum sharing has been recently proposed as a promising paradigm to improve the efficiency of resource usage in next generation mobile networks. In particular, non orthogonal spectrum sharing allows the operators to re-use the available frequencies at the cost of higher interference at the receivers. In this paper, we mathematically analyze the performance of this technique and how it is statistically...
Compressive sensing enables us to reduce the sampling rate below the Shannon Nyquist sampling rate. Unfortunately, in wideband systems, compressive sensing based signal processing often includes the undesired signals. In a previous work, ZF based method was proposed for interference cancellation. However, ZF based method do not consider the effect of noise. Moreover this method causes the degradation...
Passive direction finding is the main capability of AUVs. Methods of direction finding based on single vector are reviewed in this paper. Coherent interference of AUVs itself is very hard for acoustic direction finding system and traditional noise control method can overcomes strong interference but forms blind spots in the interference direction. In order to achieve the total space DOA estimation,...
A novel robust beamformer is proposed to suppress the coherent interferences while maintaining a distortionless response for the desired signal with direction-of-arrival (DOA) estimation errors. By dividing the received array data vector into two sub-vectors and subtracting one sub-vector from the other, a new data vector is obtained, based on which a set of constraints is formed for calculating the...
This paper evaluates the ultra low complexity non-eigen decomposition (NED) algorithm for adaptive interference mitigation. Current blind beamforming algorithms require computational complexity too high for many target applications. NED does not rely on the eignenvalues and eigenvectors used by conventional algorithms and requires significantly less computations, with a total computational load of...
In this paper, an interference cancellation and equalization method is proposed for a multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system. Standard equalization techniques such as zero-forcing (ZF), and adaptive array processing techniques such as pertone or time-domain equalization, may require large amounts of training and memory for storage of the weight...
This paper introduced the good characteristic of morphological filter and its application in purification of rotor centerpsilas orbit. Using the combination of morphological open-closing and close-opening operations, the local characteristic of the original signal could be kept and noise interferences could be eliminated effectively, then the rotor centerpsilas orbit could be purified successfully...
In this paper the performance of the ESPAR (electronically steerable passive array radiator) antenna in suppressing both the co-channel and inter-symbol interferences is compared with the conventional circular and linear arrays. For this purpose, the STAP (space-time adaptive processing) is implemented in both arrays with equal elements. Simulation results show that when the pattern of the ESPAR antenna...
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