Lenin Gopal

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Accurate power estimation has an important role for power control and handoff decisions in mobile communications. Window based weighed sample average power estimators are commonly used due to their simplicity. In practice, the performances of these estimators degrade severely when the estimators are used in the presence of correlated samples. In this paper(More)
In this paper, we propose a design scheme for amplify-and-forward multiple-input multiple-output (AF MIMO) relay system with direct link to minimize the mean-squared error (MSE) of the signal estimation at the destination. In the proposed design scheme, an optimal precoding matrix is derived with the assumption that the full channel state information (CSI)(More)
In this paper, the problem of transceiver design in a non-regenerative MIMO relay system is addressed, where linear signal processing is applied at the source, relay and destination to minimize the mean-squared error (MSE) of the signal waveform estimation at the destination. In the proposed design scheme, optimal structure of the source and relay precoding(More)
The current communication systems tend to use OFDM systems in order to provide high data rates, minimize inter symbol interference and fading effect. Some examples are 802.11, 802.16, MC-CDMA, Digital Video Broadcasting (DVB), Wireless USB or Wireless Firmware among others. Trying to provide a solution to the new devices emerging, slow standard adoption,(More)
Reversible computation plays an important role in low power circuit design and efficient energy recycling. In this paper, a switch controlled efficient Reversible Full Adder/Subtractor (RFAS) is presented. RFAS block is further used in the construction of n-bit adder/subtractor. The proposed design is analyzed and compared against the existing reversible(More)
Reversible logic is an emerging technique of upcoming future technologies. Low heat dissipation and energy recycle principle are encouraging its demand for low power daily usage portable devices. In this paper, two reversible gates have been proposed, named as R-I gate and R-II gate, for realizing reversible combinational logic circuits. The proposed two(More)
In this paper, we investigate the performance of the Tomlinson-Harashima (TH) precoder based nonlinear transceiver design for a nonregenerative multiple-input multiple-output (MIMO) relay system assuming that the full channel state information (CSI) of the source-relay link is known, while only the channel covariance information (CCI) of the(More)
In this paper, we propose a robust transceiver design for nonregenerative multicasting multiple-input multipleoutput (MIMO) relay systems where a transmitter broadcasts common message to multiple receivers with aid of a relay node and the transmitter, relay and receivers are all equipped with multiple antennas. In the proposed design, the actual channel(More)
In this paper, we present a performance comparison of Binary Coded Decimal (BCD) Adders on Field Programmable Gate Logic (FPGA) for functional and behavioural verification. Although it does not prove that the circuit is reversible, implementation on FPGA serves as a platform for functional verification of circuits. BCD adders are one such circuit which has(More)
The demand for mobile reconnaissance robots has increased since the beginning of the 21st century war. The army mainly uses these robots for reconnaissance and gathering intelligence data without putting the personnel in danger. In this paper we present the design and implementation of Wi-Fi enabled mobile robot for distributed surveillance applications.(More)