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In dense multipath channel, ultra wideband (UWB) high rate short range applications mainly face long delay and severe inter-symbol interference (ISI). Due to high rate, the spreading factor is so small that the traditional direct sequence (DS) spreading is difficult to obtain satisfactory performance. Faced with long delay and severe ISI, the length of spreading sequence and the filter length of time...
Suffered from low signal-to-noise ratio (SNR) and dense multipath, synchronization acquisition for pseudonoise (PN) sequences is critical in UWB communication systems. Conventional acquisition method adopts fixed-threshold, which always results in high false alarm probability. In this paper, an threshold scheme based on peak-to-average ratio of correlation energy is proposed, and the probability of...
Ultra Wideband (UWB) technology has attracted widespread attention all over the world for the potential applications in high-rate short-range communications. The existing UWB technologies, e.g., the direct-sequence UWB (DS-UWB) and the multi-band orthogonal frequency division multiplexing (MB-OFDM), have high complexity, which results in high power consumption and cost, and limits their marketing...
Ultra Wideband (UWB) technology has attracted widespread attention all over the world because of potential applications in high-rate short-range communications. The existing UWB technologies, e.g., the direct-sequence UWB (DS-UWB) and the multi-band orthogonal frequency division multiplexing (MB-OFDM), have high complexity, which results in high power consumption and cost, and limits its marketing...
In this paper, single-carrier (SC) modulation with frequency domain equalization (FDE) is comprehensively investigated. Maximum achievable information rates of SC systems over ultra wideband (UWB) dense multi-path channels unveil that residual inter-symbol interference (ISI) of FDE results in significant capacity loss. Therefore, we mainly focus on low complexity processing techniques of FDE to reduce...
This article presents a UWB receiver, which is made by the chips designed by our group in SMIC0.18 um process, This receiver was verified by the measurement, With the help of FPGA it can synthesis 2.8G~3.98 GHz LO frequency by changing the PLL and reference frequency, with reference frequency 21 MHz, division ratio 1/160, it can be locked at 3.36 GHz with the phase noise of -83 dBc/Hz, the internal...
This article presents a CMOS receiver that works for 3-5GHz low band SC-UWB. The receiver contains PLL, Mixer, and VGA. Double down conversion is adopted in the receiver to overcome the orthogonal clock design difficulty; digital assisted RF control method is used to increase the stability. This receiver was fabricated in SMIC01.8mmRF process with chip area of 1 × 1 mm2 ;according to measurement,...
The carrier direct-sequence spread based ultrawide-band (DS-UWB) is challenging for serious inter-symbol interference (ISI) problem, which is resulted from the dense multipath with a long root-mean-square (RMS) delay spread.We adopt a RAKE-decision feedback equalizer (RAKE-DFE) receiver in this paper to cancel the ISI. Different from the conventional selective RAKE (SRAKE), we proposed the optimum...
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