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From the mathematic expression, we can see that sidelobe power of multi-band orthogonal frequency-division multiplexing (MB-OFDM) signal is a function of the data symbols loaded on the sub-carriers. Through the derivation of the minimum of the function, relationships among data symbols, which help to suppress sidelobes, are obtained. Two types of methods, referred as sub-carrier adding (SA) method...
In this paper, a cooperative communication scheme using smart antenna is proposed for cognitive radio networks. This scheme expands the concept of cognitive radio in time and space. Using the cooperation, spectrum sensing accuracy and throughput of cognitive radio networks can be observably increased. The licensed users' detection and unlicensed users' transmission are almost carried on simultaneously...
In this paper, we propose an efficient power allocation scheme that aims at maximizing the system throughput in joint spectrum overlay and underlay cognitive radio network. We show that our proposed scheme enlarges the achievable throughput region comparing to the overlay strategy, and causes less interference than the underlay strategy. In addition, since the unlicensed users adopting the overlay...
Trust management has an important significance on the reliable operation and safety guarantee in Wireless Sensor Networks(WSNs). Previous works were implemented by exchanging key among neighboring sensors. Considering that in many cases, the sensor nodes' behavior is both spatio-temporal correlated, and this paper proposes a reputation model called BRMSN (Behavior Reputation Method for Sensor Networks)...
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....
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 investigates secondary user clusters based cooperative spectrum sensing. Secondary users in the cognitive radio network are grouped into multiple clusters and the cooperative spectrum sensing is performed on a hierarchical architecture of these user clusters, through two levels of user collaborations. The low level cooperation is carried out within each cluster while the high level one...
Partial response system (PRS) is introduced to OFDM technology to deepen spectrum notch when some subcarriers are turned off. By this, controllable interference which can be removed in the receiver without enhancing system complexity, is introduced to the cognitive radio (CR) signals. It can change spectrum shape of subcarriers of OFDM signals and deepen the spectrum notch when turning off some subcarriers...
We present a unified theory of control synthesis for generalized linear (i.e. descriptor) systems using constant-ratio proportional and derivative (CRPD) feedback. Our framework includes the theory of static state feedback and output feedback for regular state-space systems as a special case. The main elements of this theory include (1) a covering of the space of all systems, both regular and singular,...
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