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In cognitive radio networks, secondary users can opportunistically utilize the unused spectrum holes that are originally licensed to primary users. Therefore, spectrum sensing for seeking unutilized spectrum is a key element to establish cognitive radio network successfully, and cooperative spectrum sensing is a promising way to obtain more trustable sensing results. This paper considers the scenario...
Recently, a new impulse postfix OFDM (IP-OFDM) system, which performs channel estimation in time-domain by exploiting the impulse postfix instead of pilot tones, was proposed . The proposed IP-OFDM system exploits the impulse postfix, which consists of a high power impulse sample and several zero samples at the end of a OFDM symbol block, to estimate channel impulse response. As shown in , , the IP-OFDM...
This paper describes parameters design of multiuser OFDM on doubly selective fading channels. It is well-known that OFDM is vulnerable to time selectivity due to the extension of symbol period, generating inter-carrier interference (ICI). In this paper, we first derive the closed form of signal to interference plus noise ratio (SINR) for single user OFDM with a linear time-varying model. In multiuser...
Code division multiplexing (CDM) based MIMO channel sounder architecture is excellent at real-time measurement. In this paper, loosely synchronous (LS), Kasami and Chaotic sequences are suggested as candidates for the code that will be used in CDM architecture. Among those sequences, then, the best suitable sequence for channel sounding is examined through simulation. And by proposing the combined...
In this paper, we address methods of mitigating one of the major issues affecting wireless location accuracy in land mobile terrestrial environments: nonline-of-sight (NLOS) propagation. In order to improve location accuracy under such conditions, we propose a novel methodology for NLOS environments based on the use of scattering models to classify propagation environments. The scattering models allow...
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