This paper deals with a joint estimation algorithm that is dedicated to digital compensation of transmitter leakage pollution in frequency division duplexing transceivers. These transceivers are affected by transmitter to receiver signal leakage. Combined with the nonlinearity of amplifying components in the receiver path, the baseband signal received can be severely polluted by a baseband poll...

High-precision radiometric calibration and synchronization compensation must be provided for distributed radar system due to separate transmitters and receivers. This paper proposes a transponder-aided joint radiometric calibration, motion compensation and synchronization for distributed radar remote sensing. As the transponder signal can be separated from the normal radar returns, it is used t...

In multi input multi output antenna systems, beamforming is a technique for guarding against the negative effects of fading. However, this technique requires the transmitter to have perfect knowledge of the channel which is often not available a priori. A solution to overcome this problem is to design the beamforming vector using a limited number of feedback bits sent from the receiver to the t...

Wireless services and applications have become extremely popular and widely employed over the past decades. This, in turn, has led to a dramatic increase in the number of wireless users who demand reliable services with high data rates. But such services are very challenging to provide due to radio channel impairments including multipath fading and co-channel interference. In this regard, the u...

Universal-filtered multi-carrier (UFMC) aims at replacing orthogonal frequency-division multiplexing (OFDM) and enhances system robustness and performance in relaxed synchronization condition e.g. time-frequency misalignment. We proposed an algorithm based on expectation-maximization to jointly estimate the channel impulse response and the CFO that occurs due to frequency mismatch between the o...

Unified RF requirements are derived for an UTRA/FDD com-pliant mobile transceiver. Consideration of system issues,multi-mode operation, and interfacing concerns leads to de-tailed receiver and transmitter calculations based on exist-ing UMTS specifications. Finally, compliant and design-compatible transceiver requirements are derived.KeywordsRF Transceiver, UTRA/...

Beamforming is a signal processing technique that enables antenna arrays to create directional signals, increasing transmitter or receiver gain. We propose a new adaptive user antenna beamforming technique for Multi-cell Cooperative Networks which simultaneously communicates with multiple available BSs and RSs using the MS’s multiple antennas. We show that the proposed adaptive beamforming tech...

Accurate and tractable channel modeling is critical to realizing the full potential of antenna arrays in wireless communications. In this paper we propose a framework for modeling multi-antenna multipath channels based on the notion of virtual spatial angles. The virtual angles are fixed a priori and are determined by the number of antennas at the transmitter and receiver and the spacing betwee...

The present paper analyzes radio signal propagation in long tunnels with different cross sectional size and shape at various signal carrier frequencies, transmitter/receiver positions and material properties applying computer simulations. The influences of different parameters were investigated and results were compared to the empirical four-slope path loss model for long tunnels. It was shown ...