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This paper introduces a class of perfect binary sequence pair (PBSP), which is characterized by the impulse-equivalent periodic autocorrelation function (PACF) and the length of N=2k. The proposed PBSP can be generated from a class of difference set pairs (DSP). Considering the desirable properties of the proposed sequence pair, orthogonal frequency division multiplexing (OFDM) transmission with time-domain...
Spectrum sensing is one of the most important technologies for cognitive radio. In order to decrease the effect of low SNR, and increase the reliability spectrum sensing performance, we propose a novel spectrum sensing approach, which collects the distributed collaborative beamforming signals as the test statistic to input the energy detector. In particular, the collaborative beamforming method can...
Collaborative spectrum sensing enables opportunistic unlicensed access to the unused portions of the licensed spectrum. In this paper, we propose an effective sensor selection scheme for collaborative spectrum sensing over shadow fading channel using SVD-QR decomposition. Since shadow fading is correlated for closely spaced sensors, it is desired to select fewer independent sensors to reduce battery...
The uniqueness of punctured binary sequence pairs is proposed and proved. In particular, perfect punctured binary sequence pairs (PPBSP), almost perfect punctured binary sequence pairs (APPBSP), pseudorandom punctured binary sequence pairs(PRBPSP) and punctured binary sequence pairs with two-level autocorrelation(PBSPT) are proved as the specific cases of perfect punctured LCZ/ZCZ sequence pairs....
In this paper, a statistical analysis of the peak-to-average power ratio (PAPR) of Polynomial cancellation coded OFDM (PCC-OFDM) signals is presented. PCC-OFDM has the good performance of compressing intercarrier interference (ICI) at the cost of high PAPR. The most PAPR analysis assume the subcarriers to be identically and independently distributed (i.i.d). However, the correlation between adjacent...
A perfect punctured binary sequence pairs (PPBSP) circular correlation based channel estimation algorithm for orthogonal frequency division multiplexing (OFDM) is proposed. The original sequence of PPBSP with cyclic prefix (CP) is inserted between OFDM symbols as training sequence. The cross-correlation is calculated between the received sequence with CP removed and the punctured sequence of PPBSP...
A new discrete array signal is proposed, which is punctured binary array pair with two-level autocorrelation (PBAPT). The spectrum characters and some combinatorial admissibility conditions for PBAPT searching are given. The research results show the fact that PBAPT extends the scope of discrete array signal and enrich the theory of punctured array pair signal.
This paper mainly introduces the drought monitoring model based on the cloud parameters method and Remote Sensing data with a stable performance to the temporal and spatial variation of remote sensing data, especially in the spatial scale. Based on the fundamental of solar radiation, we deduce the spatial modification functions about the different drought levels with the regression method. Meanwhile,...
In order to decrease the signal length and transmitting time, improve accuracy of the delay time estimate, complete the mission of ranging and communication at the same time, a new ultra wideband (UWB) ranging method is developed in this paper. This method modulates the training sequence and information signals respectively on two carrier waves which are orthogonal mutually, and then combines them...
This paper proposes a completely new periodic correlation signal-almost perfect punctured binary sequence pair (APPBSP). We present the definitions of APPBSP and its transformation properties. To reduce the searching range and improve the searching efficiency of APPBSP, limited conditions of APPBSP are discussed to decide the punctured locations within the sequence pair. Searching results of APPBSP...
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