Peerapong Uthansakul

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Recently, an outstanding wideband beamformer utilizing only space domain, not time or frequency domain, has been proposed, so called wideband spatial beamformer. The advantage of this beamformer is that it requires only attenuators or amplifiers to perform beam formation in wide frequency band as its weighting coefficients become real values. As a result(More)
This paper presents a full-duplex transceiver system design operating with a single channel using a single antenna for both transmitting and receiving paths. To implement such a system, the self-interference is necessary to be eliminated. From literatures on RF interference cancellation, there has not been any suitable technique to deal with a single(More)
In this paper the performance of a Multiple Input Multiple Output (MIMO) wireless communication system operating in an indoor environment, featuring both Line of Sight (LOS) and Non-Line of Sight (NLOS) signal propagation, is assessed. In the model the scattering objects are assumed to be uniformly distributed in an area surrounding the transmitting and(More)
In Cognitive Radio (CR) network, the secondary users are required to sense the spectrum based on their environment and then they adapt the spectrum as well as the transmission scheme for CR services to the vacant channels. Multiple-Input Multiple-Output (MIMO) technique becomes an interesting option for CR networks because it can increase the spectrum(More)
In this paper, the performances of using Fractional Frequency Reuse (FFR) schemes together with beamforming technique are presented. The key performances in terms of Signal-toInterference plus Noise Ratio (SINR) and channel capacity are compared. The beamforming antenna array have been both simulated and measured. The results show that the beamforming(More)
In this paper, the performance of wireless local area networks (WLANs) with Single-User MIMO (SU-MIMO) vs. Single-User Beamforming (SU-BFM) and Multi-User MIMO (MU-MIMO) vs. Multi-User Beamforming (MU-BFM) schemes in terms of data rate and average throughput has been investigated. The MIMO technique is the use of multiple antennas at both transmitter and(More)
Relay station is a recent approach for multihop cellular networks to increase a signal quality as well as support a high speed data transmission. The coverage range of relay station is determined by its transmit power and level of handover between relay station and its base station. This coverage range directly influences to handover performance. If number(More)
From literatures, path loss effect has not been taken into account when analyzing beamforming performance of distributed or cooperative beamforming networks such as Wireless Sensor Networks (WSNs). Therefore, this paper investigates into the mentioned effect on beamforming performance of WSNs through computer simulation. The obtained results indicate that(More)
It is the fact that the bandwidth of wireless communication system is such a limited resource that several techniques are selectively applied to increase the bandwidth efficiency. The highest bandwidth efficiency can be taken by applying MU-MIMO technique. For this technique, the complexity of detection at receiving side is rapidly increased by increasing(More)