This paper presents a brief overview of spacetime algorithms for communication systems operating in quasi-static Rayleigh flat fading environments. The space-time algorithms exploit a multi-input multi-output (MIMO) channel and are designed to meet criteria for optimality under three different channel state information (CSI) conditions: 1) CSI at receiver and transmitter, 2) CSI at receiver but...

A quasi-optical multi-ray model for a short-range millimeter wave radar is presented. The model considers multi-path effects emerging while multiple rays are scattered from the target and reflected to the radar receiver. Among the examined scenarios, the special case of grazing ground reflections is analyzed. Such a case becomes relevant when short range anti-collision radars are employed in ve...

In the model of (k; n) multi-receiver authentication codes (A-codes), a transmitter broadcasts a message m to n receivers in such a way that not only an outside opponent but also any k ? 1 receivers cannot cheat any other receiver. In this paper, we derive lower bounds on the cheating probabilities and the sizes of keys of (k; n) multi-receiver A-codes. The scheme proposed by Desmedt, Frankel a...

Full-duplex data communications over a multi-input/multi-output linear time-invariant channel is considered. The minimum mean square error (MMSE) linear equalizer is derived in the presence of both nearand far-end crosstalk and independent additive noise, assuming correlated data, and colored noise. The MMSE equalizer is completely specified in terms of the channel and crosstalk transfer functi...

Multi-receiver authentication is an extension of traditional point-to-point message authentication in which a sender broadcasts a single authenticated message such that all the receivers can independently verify the authenticity of the message, and malicious groups of up to a given size of receivers can not successfully impersonate the transmitter, or substitute a transmitted message. This pape...

This paper1 addresses the performance limits of a multi-band/multi-user frequency fading channels. We firstly study the optimal diversity-multiplexing trade-off of such systems when channel state information is available at the receiver only (CSIR). However, when channel state information is made available at the receiver and at the transmitter (CSIT), the transmitter knows the channel gains an...

Synthetic impulse and aperture radar (SIAR) is a multi-input multi-output orthogonal multicarrier frequency radar, kind of diverse array (FDA). This has omnidirectional emission in the transmitter each receiver or receiving can form beam. The 4D matched filter this radar’s circular arrays reveal range, elevation angle, azimuth Doppler. existence high sidelobe range-Doppler one significant chall...

Passive, bistatic radar offers an attractive method for remotely detecting and imaging targets without the requirement of a dedicated transmitter. Passive radar systems are usually cheaper than their active counterparts, which easily allows for multi-sensor networks. Furthermore, passive radar systems are difficult to detect and jam. With these advantages come several challenges, however. Bista...

in ultra-wideband (uwb) multistatic microwave breast cancer imaging, the long imaging time is an important issue. in this paper, a novel imaging method for multistatic uwb radarbased microwave breast cancer imaging using sparse sampling has been proposed that significantly reduces the amount of data and imaging time. in this method, instead of measuring multistatic radar signals conventionally,...

In this letter, we introduce a design consideration for super-Nyquist FMCW radar systems relating to transmitter to receiver noise leakage. Phase noise curves comparing the fundamental DDS frequency and its 2nd super-Nyquist image show a significant increase in relative noise level at all offsets from the carrier. This results in a reduced transmitter signal-to-noise ratio. It is shown with a s...