Frame synchronization in UWB using multiple sync words to eliminate line frequencies

Abstract

Ultra Wide-Band (UWB) is now under consideration as an alternative physical layer technology for wireless PAN. UWB radio uses base-band pulses of very short duration, thereby spreading the energy of radio signal very thinly over gigahertz. The Power Spectral Density (PSD) of UWB signals consists of continuous component and discrete component. Generally speaking, the discrete component presents greater interference to narrow-band communication systems than the continuous component. Frame synchronization is commonly used in multiple access systems, including wireless PAN systems.The sync word will generate strong PSD. In this paper, we devise a more efficient and better performance mechanism to suppress the discrete component of the PSD of UWB signals by randomizing the pattern of UWB signals. The mechanism can also be applied to payload data to smooth the PSD of USB signals.

Ultra Wide Band (UWB) Interference - Assessment and Mitigation Studies

“…0 = p during the UWB transmission. In [Mo03] three different schemes (phase reversion, linear phase shift registers or phase reversion on synchronization (SYNC) bits) have been proposed to achieve this goal. We will briefly comment on the phase reversion approach.…”

Fast Selecting Optimal Sync Word Based on Filtering and Backtracking for Burst Synchronization

“…P RP 1 (SW, T ) = W j=1 P P (S i , T ), P RP W+1 (SW, T ) = P SW (T ) (4) Note that, when the coarse synchronization locates the 1st rough position, according to the detection rule mentioned above the (W + 1)-th position, i.e., the SW position, will be correctly indicated as the frame start if the detecting position slides to the SW position. So, PRP 1 (SW, T ) hasn't the misdetection probability item at the SW position, PSW (T ).…”

“…Burst data transmission is widely employed in various applications such as satellite time-division multiple-access (TDMA) communication systems [1], terrestrial mobile cellular communication systems [2], wireless LAN [3] and wireless PAN communication systems, including Ultra Wide-Band(UWB) networks [4], [5]. Due to space propagation delays and clock imprecision, signals may arrive at different timing points.…”

Spectrum shaping of PPM TH-IR based ultra wideband systems by means of the PPM modulation index and pulse doublets

“…The expression given by (4) is general enough to cover different modulation parameters, different PR codes and different kinds of jitter. For the important case of the C,'s being itself independent identically distributed (iid) random variables (Iv) with common probability distribution function (pdf), g;(4), (4) can be expressed as (6) where W() is the Fourier transform of the pulse waveform, w(t), and IG;(f)| = (m-n) = £ lej2if( ¢f ) )g; (4`mg )g;(4f, ) d4m d;m2 (7).…”

“…PAM TH-IR and DS-IR UWB systems), however in this paper the use of the pulse doublets is focused on the elimination of the spectral lines shown by the PSD of typical PPM TH-IR based UWB systems. Note that the topic of spectral shaping and spectral line elimination of PAM based UWB systems have been previously addressed on [4,7].…”