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In recent years, M2M (machine to machine) communications has increasingly been seen as a new growth area for wide-area wireless technologies which were designed for voice and high-speed packet data applications. In this paper, we use simulations to estimate the capacity of M2M applications over one of the widely used 3G wireless systems, CDMA2000 1x. We present capacity estimates of the CDMA2000 1x...
The recent 60GHz mm-wave technology opens a new era for multi-gigabit wireless communication systems. This enables the transmission of Gigabit-per-second applications like applications for transmission of uncompressed high definition video. However, 60GHz mm-wave technology faces a critical challenge of designing high-speed, high-precision Analog-to-Digital Converter (ADC) which is either hard to...
In this paper, we study the I/Q imbalance effect of wireless communication systems at the transmitter side and the novel transmitter I/Q imbalance parameters estimation and signal pre-compensation schemes are proposed. The I/Q imbalance parameters estimation of the transmitter is based on the statistical properties of the in-phase and quadrature-phase parts of the signals. The pre-compensation scheme...
In this paper, we propose a relay-assisted transmission scheme in cognitive radio (CR) to exploit spatial spectrum holes, which are generated by relay techniques. The proposed scheme enables CR users to coexist with primary users at the same time in the same geographic area and spectrum band. Compared to conventional schemes, a higher spectrum efficiency is achieved by our method. We further analyze...
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