The maximum achievable data-rate of a quantum communication system can be critically limited by the efficiency and temporal resolution of the system's single-photon detectors. Frequency up-conversion technology can be used to increase detection efficiency for IR photons. In this paper we describe a scheme to improve the temporal resolution of an up-conversion single-photon detector using multi-...

The fast development of wireless communication systems requires more flexible and cost effective radio architectures. A long term goal is the software defined radio, where communication standards are chosen by reconfiguration of hardware. Direct analog to digital conversion of the radio frequency (RF) signal is still unrealistic at present time, due to the high requirements imposed on the analo...

Experimental evaluation of sampling processes is essential when the bandwidth of a DSP system is in the GHz frequency range. The suggested method for evaluation of the pseudorandomized sampling processes allows to establish the location of sampling instants during the digitization process with picosecond resolution. The method is implemented in the DASP-Lab System as its integral part. Some exa...

Multi-carrier code division multiplexing (MC-CDM) is one of promising multiplexing techniques for fourth-generation mobile downlink communications systems, where high data rate services should be provided even for high speed-cruising mobiles. For MC-CDM-based packet communication, a frequency scheduling method, which adaptively assigns different sub-carriers to different users, is proposed. Thi...

This paper deals with the digital control of a particular class of non-linear singularly perturbed (NLSP) systems. Three distinct multi-rate composite control strategies are discussed. In the ® rst case, it is assumed that measurements of the slow and fast variables are scheduled at the same fast sampling period nd . Then, multi-rate measurements are considered and two di€ erent strategies are ...

Broadband single-carrier frequency division multiple access (SC-FDMA) uplink using frequency-domain square-root Nyquist filtering is considered. The peak-to-average power ratio (PAPR) of filtered SC signals can be reduced by increasing the filter roll-off factor α. Furthermore, an additional frequency diversity gain can be obtained by making use of the excess bandwidth introduced by the transmi...