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This paper presents an evaluation of the non-linear compensation effect of a base station power amplifier while taking into consideration adjacent channel interference between different mobile communication systems. Adjacent channel interference causes an increase in the receiver noise level due to non-linear distortion components of a base station power amplifier operating in an adjacent channel...
Recently, wireless ad hoc communication systems have been receiving attention. In order to improve the efficiency of such networks, researchers have tried to apply adaptive array antennas (AAA) for interference cancellation in the space domain. In this paper, we propose a new method based on a new concept, called cross-degree of freedom (CDOF), for the application of AAA to ad hoc communications....
Noise reduction is one of the most crucial functions, if not the most, in hearing aids, as hearing impaired people have great difficulty in understanding speech in noisy environments. In the past, we proposed a two-microphone noise reduction system with one-channel output. In this paper, we further extend this previously proposed noise reduction method for hearing aids application by applying the...
EM noise emission in the radio bands from the communication harness of vehicle-mounted LAN is evaluated by performing an actual measurement test complying with CISPR25. This report provides a method used to define the specifications for the transmitter circuit and receiver circuit required to satisfy the AM noise limit in the test. The noise propagation is analyzed in common and differential modes...
The cognitive radio is a secondary wireless communication system that can overlap the frequency band assigned to the primary system by recognizing the frequency status. Ad-hoc cognitive radio is considered for realizing the cognitive radio by using multi-hop communication networks without giving the large interference toward the primary system. We have proposed the STBC distributed ARQ system applied...
In this paper, we propose a new concept namely forward interference avoidance (FIA) using adaptive array antennas (AAAs) for wireless mobile ad hoc networks (MANETs). It enables nodes to avoid interfering with other nodes so that it results in increasing the number of co-existent wireless links. The performance improvement of MANET in terms of the increase of the number of co-existent communication...
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