Abstract – Performance degradation of an analog FM and PAL-G signal due to Spread Spectrum (SS) interference is investigated. An analytical expression between RF TV protection ratio (CIR) and baseband unweighted Signal-toNoise ratio (SNRV), for co-channel spread spectrum and noise interference, is derived. Also, we expressed the audio frequency signal-to-noise ratio (AF SNR) output due to SS ov...

The cellular telephone success story prompts the wireless communications community to turn its attention to other information services, many of them in the category of "wireless data" communications. One lesson of cellular telephone network operation is that effective power control is essential to promote system quality and efficiency. In recent we have applied microeconomic theories to power c...

In wireless sensor networks, knowing real signal interferences (received signal strength or RSS) from other sensors to cared sensor is critically important for protocol design and for many applications. However, the real interferences generally differ much from those calculated by theoretical or empiri­ cal models, because these models cannot capture the dynamic impacts of the environments. Thi...

This paper investigates the Weighted Linear Parallel Interference Cancellation (WLPIC) Multiuser Detection (MUD) scheme with Vertical-Bell Laboratories Layered Space-Time (V-BLAST) signal detection algorithms in uplink Code Division Multiple Access based Multiple Input Single Output (MISOCDMA) system. The Bit error rate performance of WLPIC scheme with V-BLAST signal detection and Conventional ...

Because random variations in signal-to-noise plus interference ratio (SNIR) profoundly affect mobile ad hoc network performance, good estimates of mean SNIR are essential for reliable routing. This paper proposes that signal levels be estimated independently from noise plus interference (N+I) levels because 1) N+I levels can be estimated when the signal is absent, 2) signal estimates must allow...

The Ad-hoc wireless networks are assuming great importance because of the ease of operation and their operation without any infrastructure. On the other hand, it has its own characteristics like operation from low-capacity battery, frequent change of routing and connectivity etc.. Bit Error Rate (BER) of any wireless data network is critically dependent on the signal to noise and distortion(SIN...

In order to effectively extract the characteristics of nonstationary vibration signals from hydropower units under noise interference, an adaptive stochastic resonance and Fourier decomposition method (FDM) based on genetic algorithm (GA) are proposed in this paper. Firstly, GA is used optimize parameters so that signal can reach optimal signal-to-noise ratio (SNR) be improved. Secondly, FDM pr...

The aim of this paper is to detect fetal heart beats temporally overlapping with the transabdominally-measured QRS-complexes of the mother, non-invasively. Modified, Weighted and uterine contraction interference signal covariance matrix incorporated spectral MUSIC technique is applied. It is based on partitioning the subspace containing the ECG signal bearing the mother and fetal, and the ortho...

Jammer and interference are sources of errors in positions estimated by GNSS receivers. The interfering signals reduce signal-to-noise ratio and cause receiver failure to correctly detect satellite signals. Because of the robustness of beamforming techniques to jamming and multipath mitigation by placing nulls in direction of interference signals, an antenna array with a set of multi-channel re...

This paper proposes a new approach for the analysis of reconstructed interference fields in digital holographic interferometry. In the proposed approach the interference phase to be estimated is conceived as a piecewise polynomial signal; consequently, each segment of the reconstructed interference field is modeled as a polynomial phase signal (PPS) with constant or slowly varying amplitude. Un...