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This paper presents a new signal structure for spectrum sensing under active cognitive radio (CR) transmission (i.e., active sensing). Specifically, the known pilots used for the base station of primary users (PU) are duplicated and reallocated in the CR transmission signal properly so that there is no overlap between the reallocated pilot subcarriers and the original subcarriers. Given the CR signal...
In cooperative relay systems, relayed signals propagate through different channels and are received at the destination node with distinct timing and carrier frequency offsets (CFOs). This feature makes synchronization a rather challenging task as compared with centralized multiple-input multiple-output systems. Unlike conventional preamble designs with good correlation properties only in time domain...
An adaptive Orthogonal Frequency Division Multiplexing (OFDM) system, with a preceded cyclic prefix (PCP), was proposed earlier to address the recent need of robust and flexible transmission technique in cognitive radio (CR) communications [1]. Identification of PCP-OFDM signals is therefore of great importance for the design of fair spectrum sharing mechanism, particularly at very low signal-to-noise...
The geometric sequence has been shown feasible for large carrier frequency offset (CFO) acquisition, while the modulatable orthogonal sequence (MOS) has been used to assist joint time synchronization and channel estimation in orthogonal frequency-division multiplexing (OFDM) systems. This paper first proposes a method to make an MOS partially geometric. Consequently, the partially geometric MOS can...
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