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It is known that the main limitation of implementing the multiple input multiple output (MIMO) system is the complexity and high cost of the hardware in the RF section. In this paper, an approach of using time division multiplexing (TDM) with a MIMO receiver to reduce the power consumption and cost of the multiple antenna RF chains is proposed and evaluated. By using the TDM technique, our proposed...
Conventional MIMO (multiple input multiple output) system is required to a number of RF chains as much as a number of antennas. If a number of antennas increased then a number of RF chains increased. Therefore, it is difficult to apply conventional MIMO system to mobile terminals with limited power. In this paper, we propose a TDM (time division multiplexing)-based single RF chain MIMO system. The...
Because of the limitations of the sampling speed and power consumption in the very high frequency several bands of the wireless communication systems, the current receiver cannot directly sample the incoming signals at the Nyquist rate just after a RF stage process. Instead, using the sub-sampling technique can convert multi-band signals from RF band to IF band without oscillators. But Due to the...
In downlink orthogonal frequency division multiple access (OFDMA) systems, available subcarriers are divided into groups and assigned to multiple uses for simultaneous transmissions. The ideal universal receiver sampling the incoming signals just after a RF stage is very seducing but not realistic at this time due to limitations in sampling capabilities for high frequency systems. Software-defined...
This paper is studied about multi-band receiver using sub-sampling and time division multiplexing (TDM) techniques. Software defined radio (SDR) has a goal that places the analog to digital converter (ADC) as near the antenna as possible. But current technique actually cannot process ADC about radio frequency (RF) band signals. So one method is being studied that samples RF band signals to intermediate...
In software defined radio, the analog-to-digital converter (ADC) should be placed as close to antenna as possible. But current technique actually can't do analog-to-digital conversion from RF band signals. So, one method has been studied to sample RF band signals to IF band. As one of the ways, sub-sampling technique can convert signals from RF band to IF band without oscillator. If sub-sampling technique...
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