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This paper focuses on interference cancellation techniques to improve performance of code-acquisition in code-division multiple access systems. We propose a decoder-aided technique with parallel interference cancellation to overcome multiple access interference in order to detect weak users in a near-far environment. In particular, we consider the case where interference is cancelled after a certain...
In this paper, we propose clipping scheme and equalizer as methods to reduce the effects of impulsive noise and channel attenuation in power line communication (PLC) system. Clipping is cutting off amplitude of the received signal over threshold level without its phase change and the equalizer compensates effects of PLC channel. The performance is evaluated in terms of bit error rate (BER). From simulation...
In this paper, a multi-user beamforming scheme is presented in multi-user multi-input multi-output (MIMO) downlink channels with other cell interference (OCI). The proposed scheme consists of maximizing signal-to-leakage-and-noise ratio (SLNR) and whitening the OCI for power allocation. The conventional scheme which eliminates perfectly intra-cell interference has several problems such as antenna...
For the complex environment of coal mine, there are many noises and random errors, which make larger location error in coal mine, lead to the difficulty of finding the precise positions of staff. This paper presented an improved location algorithm based on time average, which was the characteristics of lower computational complexity, less communication cost and stronger anti-interference ability....
Second-order intermodulation products are produced by non-linearities in the transfer functions of the receiver's signal processing blocks. Especially in homodyne receivers the second-order intermodulations are problematic since they are convolved into baseband and overlap the wanted signal. In this paper a Least-Mean-Square (LMS) adaptive filter approach to estimate and cancel the transmitter (TX)...
Wireless communication service providers are having to co-locate base stations (BTS) on common sites, since little space is available to build new ones. BTS receivers have to receive weak desired signals at the presence of strong transmit signals from co-located transmitters; resulting in interference and desensitization. This leads to higher dynamic range requirements for BTS receivers. The paper...
In the practical experiment to electrical signal of submerged arc welding process, it is difficult to avoid noises, so an important step is to eliminate the disturb of noise. Based on the wavelet algorithm, wavelet packet filtering method is analyzed in this paper. It has been proved by the experiments that the wavelet packet filtering based on soft threshold is a better de-noising method, Filtering...
This paper proposes a mechanical-noise suppressor based on a priori noise information for digital still cameras and camcorders. With given timing information about noise periods, mechanical noise generated by motors and lens-actuators is suppressed based on reference noise data prepared in advance. The noise replica is generated from the reference noise and subtracted from the input signal for suppression...
A real-time adaptive noise masking method for ambient interference mitigation is proposed. The noise masker is implemented below the auditory masking surface of concurrent music and is thus inaudible. The noise masking parameters are also adapted to ambient interferences and room acoustics to improve masking efficiency.
During the initial uplink synchronization, the BS communicates with MSs to adjust timing and power offsets. The common method to achieve the objective is to use the orthogonal code in the frequency domain for OFDMA systems. Due to the timing offset, the orthogonality of codes is decayed and multiple access interference (MAI) becomes serious. In order to decrease this influence, we proposed the idea...
One of the major factors of performance degradation in OFDM transmission is influence of additive impulsive noise. Because of wide band property of impulsive noise, it affects the symbols transmitted on many sub-carriers and bit error rate characteristic severely degrades. In this paper, an iterative scheme that reduces influence of impulsive noise by generating a replica signal of impulsive noise...
In this paper we assess the impact of the on-board base station emissions, on terrestrial mobile station. The scenario consists of multiple interfering links (multiple aircrafts). The results showed that there is visibility of the on-board networks in terms of noise floor increase especially for GSM-1800 MHz networks, and the output of the base station should be adjusted below 5 dBm, if we want to...
Number of indoor Wireless Sensor Network (WSN) applications are increasing day by day. However, there are many interferers (like 802.11 × and 802.15.4 devices) effecting 2.4 GHz band. Moreover, co-existence is a bigger challenge for WSNs because of their tiny structure and resource constraints. In this paper, a novel method is proposed to predict the near future channel quality using the statistical...
This paper proposes a novel terrain scattered interference (TSI) suppression method for multichannel SAR. This method is based on an improved Fast-time space time adaptive processing (STAP). It can be used to reject the wideband noise-like TSI signal impinging on the main beam of SAR antenna. The point-target simulation and area target simulation are used to show the working principle of the proposed...
A new detection method is presented for the detection of dim small targets from infrared image sequences is presented. Firstly, Robinson guard filter suppresses the background clutter in single frame. Secondly, a auto-adaptive threshold algorithm is applied to segment the potential targets from background. Finally, the bi-direction chain is used to identify the real target base on the continuity of...
In this paper, to the aim of more than 10 dB power noise suppression, investigation of spiral resonators applied in the vicinity of the practical high-speed digital circuit. Their performances are characterized in terms of their capability to effectively suppress simultaneous switching noise in the frequency region of interest with small occupying area on the power distribution network. As a starting...
Edge detection is a critical element in image processing, since edges contain a major function of image information. The function of edge detection is to identify the boundaries of homogeneous regions in an image based on properties such as intensity and texture. Many edge detection algorithms have been developed based on computation of the intensity gradient vector, which, in general, is sensitive...
We propose the use of simple full inter-relay self interference cancellation (FSIC) at the relay nodes within a four relay network. The four single antenna relay nodes are arranged as two spatially well separated groups of two relays with offset transmission scheduling. This approach can achieve the full available distributed diversity order and its end-to-end transmission rate can asymptotically...
The problem of cancellation of a nonstationary sinusoidal interference, acting at the output of an unknown multivariable linear stable plant, is considered. The proposed cancellation scheme is a nontrivial extension of the SONIC (self-optimizing narrowband interference canceller) algorithm, developed earlier for single-input, single-output plants. In the important benchmark case - for disturbances...
This paper proposes filtering methods to cancel the impulsive disturbance contained in position error signal (PES) in hard disk drives (HDDs). The impulsive disturbances may be observed as a few single sudden changes or some consecutive changes in PES. The filtering includes impulsive disturbance identification and estimation. A recursive method is used to determine the dynamic boundaries for identification...
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