Radioengineering

Weak Target Integration Detection Based on Radar Communication Integrated Signal via Constructed Step-LFM Model

Weak target detection is a great challenging in radar field. To detect weak targets via radar communication integrated signal, a method for constructed step-LFM (CStep-LFM) signal is proposed based on quadrature amplitude modulation-orthogonal frequency division multiplexing (QAM-OFDM) echoes. First, a QAM-OFDM and CStep-LFM model is established, and then a bandpass filters bank is used to transform the QAM-OFDM echo into a Step-LFM signal.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0195_0203.pdf

target detection -LFM communication integrated signal -OFDM

Deep-Learning-Based ModCod Predictor for Satellite Channels

One of the significant challenges for satellite communications is to serve the ever-increasing demand for the use of finite resources. One option is to increase channel utilization, i.e., to transmit as much data as possible in a given frequency range. Since the channel is highly variable, primarily due to the ionosphere and troposphere, this goal can only be achieved by adaptively varying modulation and coding schemes.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0182_0194.pdf

links series prediction classification machine learning -S2 channel band -Earth communication signal propagation

Differential Spatial Modulation Using New Index Bits

Spatial modulation (SM) has the potential to meet the requirements of 5G and beyond communication systems with features such as reduced hardware complexity and good trade-off between spectral efficiency and energy efficiency. In this study, an efficient non-square differential spatial modulation (DSM) scheme is presented in which the number of time slots is one more than the number of transmit antennas. The introduced scheme includes one empty time slot. At the other time slots, the time slots of the conventional DSM (CDSM) are used (the Gray code order (GCO) can also be used). There is one active antenna at each time slot of the proposed scheme.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0173_0181.pdf

modulation index modulation spatial modulation (DSM) active antenna propagation to noise per bit (SNRb)

Modified Costas Loop for Carrier Phase Tracking in GPS Receivers

The carrier phase received at the receivers of the Global Positioning System (GPS) links is used to detect navigation data and to precisely determine the position, speed and time corresponding to the user's equipment. Therefore, subsystems for carrier phase tracking are crucial parts in all GPS receivers. When the propagation conditions are favorable, the method frequently used for phase tracking is based on Digital Phase-Locked Loop (DPLL)) and implemented through the discrete Costas loop operating under the modulated L1 carrier, in the case of a GPS receiver.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0145_0154.pdf

phase tracking receiver loop recovery

On the Performance of Multi-Robot Wireless-based Networks

The performance of the multi-robot wireless-based networks is investigated in this paper. Particularly, we derive the outage probability (OP) and potential throughput (PT) of the worst terminal in the closed-form expressions under two scenarios, with and without direct transmission from the centre robot to all terminal robots. The considered system is complicated since it involves many random variables (RVs) and they are correlated owing to the common link from the central robot to the relay one.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0127_0135.pdf

-robot networks probability combining analysis throughput

A High Directivity Microstrip Coupler Based on Reflective Resistors

In this paper, a novel high-directivity microstrip coupler based on reflective resistors is presented. The proposed coupler consists of three pairs of coupled-line sections and one pair of resistors. Generally, the coupling degree can be controlled by the coupled-lines, while the resistors are employed to adjust the amplitude of the reflected signal to cancel out the leakage signal. The mechanism of high directivity is derived and the S-parameters are presented.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0121_0126.pdf

directivity coupler -parameters