Research
Performance Analysis of Quantum Dot Intermediate Band Solar Cell (QD IBSC)
Now-a-days quantum dot intermediate band solar cell (QD IBSC) is the most promising approach for increasing the efficiency of the solar cell. In this paper InxGa1-xN &GaAs based p-i-n reference cell and quantum dot intermediate band solar cell where AlxGa1-xAs is used in window layer have been studied for high efficiency and evaluated the performance with various parameters. Here quantum dots of InAs&InN are placed in the i-layer of p-i-n reference cell. V-I characteristics of p-i-n reference cell using GaAs, AlxGa1-xAs is observed & maximum efficiency & the short circuit current density is found 32.87% & 350 A/m2 respectively. Also an increased efficiency of 41.45% & short circuit current density of about 466.07 A/m2 is to be found for same structure using InxGa1-xN material. Maximum efficiency & short circuit current is to be found 58.77% & 649 A/m2 respectively for InxGa1-xN based QD IBSC and 51.59% & 543.36 A/m2 for GaAs based QD IBSC respectively. Comparing all the results we have found that InxGa1-xN based Quantum dot intermediate band solar cell offers the better efficiency.
Performance Analysis of Zero Forcing Equalizer in 2A2 and 3A3 MIMO Wireless Channel
Wireless transmission is affected by fading and interference effects which can be combated with equalizer. The use of MIMO system promises good improvement in terms of spectral efficiency, link reliability and Signal to Noise Ratio (SNR). The effect of fading and interference always causes an issue for signal recovery in wireless communication. Equalization compensates for Inter-Symbol Interference (ISI) created by multipath within time dispersive channels. This paper analyzes the performance of Zero forcing method for MIMO wireless channels. The simulation results are obtained using MATLAB. The Bit Error Rate (BER) characteristics for the various transmitting and receiving antenna simulates in MATLAB and describes many advantages and disadvantages of the system. The simulation results show that the equalizer based zero forcing receivers is good for noise free channel and is successful in removing ISI.
