The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We present a novel BCH code based sequences design method for generating large families of ranging sequences. The sequences can be used in an OFDMA network to offer sufficient ranging opportunities and guarantee low probability of false detection. Each derived sequence has low peak to average power ratio (PAPR) and cross-correlations with other sequences. These properties enable a mobile receiver...
MIMO channel measurements at different UHF frequencies have been made in an urban vehicular environment. The data show that the spatial diversity decreases with frequency, attributed to an increase in scattering near the mobile receiver, resulting in weaker angular multipath components. The spatial structure of the channel changes more slowly, however, at lower frequencies, leading to less degradation...
We consider the use of transmit and receive filters as optimum terminal filters to mitigate the effects of fading channel in frequency division duplex-code division multiple access (FDD-CDMA) systems. It is shown that the effects of multipath fading channel at the mobile receiver can be mitigated by properly designing of the filters based on the use of channel information. In order to compensate the...
In frequency non-selective fading channels the multipath components can arrive at the mobile receiver via a three dimensional (3-D) scattering mechanism. That case occurs especially in urban environments, in which the tall buildings and other obstacles cause an arrival of multipath energy in the elevation plane, besides that arriving in the azimuth one. Another issue, which is a matter of investigation,...
In order to reduce the complexity of the mobile receiver, we propose a prefilter model using a linear FIR pre-filter for minimizing the probability of error (MPOE) in multiuser transmission scenario. We consider downlink transmission and assume complete knowledge of the channel at the base station. In order to fully utilise the knowledge available at the transmitter, the filter weights are computed...
Ultra wideband (UWB) impulse radio (IR) system has recently being considered for several applications due to its attractive features that include low-power carrierless and ample multipath diversity. Among the various modulation and multiple access schemes, this paper deals with time-hopping (TH) binary pulse position modulation (PPM) operating in the presence of frequency-selective multipath fading...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.