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One of the biggest challenges in ultra-wideband impulse radio (UWB-IR) is timing acquisition. To accomplish synchronization, a novel modulation scheme is presented in this paper. Relying on the unique signal structure and the first order- statistics of the received signal, the timing offset can be acquired by energy detection even if in the presence of inter-frame interference (IFI) and inter-symbol...
In the space-time cooperative relay orthogonal frequency division multiplexing (OFDM) system, a challenge is the lack of perfect timing synchronization, which degrades the performance of the receiver greatly. This paper investigates a timing synchronization scheme to solve this problem. Unlike the conventional algorithms, our attempt primarily aims to obtain the different time delays of source and...
One of the biggest challenges in ultra-wideband (UWB) communications is the accurate and rapid timing acquisition for the receiver. This paper presents a timing acquisition scheme dispensing with searching for UWB communications. Without training sequence involved, timing offset parameter is estimated by exploiting a stream of alternating orthogonal pulses, and frame-level synchronization can be achieved...
In this paper, a novel scheme is developed for chip-level timing in UWB communications. To accomplish the proposed algorithm, the time hopping (TH) code is transformed to the spread time hopping (STH) code firstly, without changing ideas of UWB modulation. Invoking the cyclic autocorrelation of STH code, the timing parameter is acquired without training sequence. Desirable performance is brought out...
In this paper, a novel quasi-4PPM modulation is presented firstly for UWB systems, and then the corresponding synchronization and demodulation schemes are proposed. Due to the nature of the unique signal structure, the information bits are transmitted and demodulated by twos, which doubles the transmission efficiency compared with conventional existing methods under the same condition. Besides, the...
In this paper, we propose a new blind synchronization algorithm for ultra-wideband (UWB) systems based on pseudo random time-hopping (TH) codes. The synchronization parameter is acquired by using integrate-and-dump (I&D) among several segments (these segments are chosen according to a user-specific TH codes) of the observation waveform and peak-picking the outputs of the I&D device. Due to...
In this paper, a low complexity blind synchronization algorithm is proposed for ultra wideband (UWB) communication systems in the multipath environment. Using the first order statistics of the received signal, the proposed algorithm is carried out without aided data. The synchronization parameter and nuisance ones are separated from each other on account of the structure of the Vandermonde matrix,...
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