Search Results - "Koilpillai, David"

Limited-Feedback Low-Encoding Complexity Precoder Design for Downlink of FDD Multi-User Massive MIMO Systems by Dutta, Biswajit, Budhiraja, Rohit, Koilpillai, David R.

“…We investigate a limited feedback precoder based on symbol pairwise error probability (PEP) for a block-faded K×n t downlink multiple-input multiple-output…”
Get full text

Synchronization techniques for underwater acoustic communications by Sameer Babu, T. P., Ameer, P. M., David Koilpillai, R.

“…Summary Underwater acoustic channel is a challenging medium for communication due to the presence of significant multipath, high noise, frequency‐dependent…”
Get full text

Dispersion and Nonlinearity Distortion Compensation of the QPSK/16QAM Signals Using Optical Phase Conjugation in Nonlinear SOAs by Sobhanan, Aneesh, Venkatasubramani, Lakshmi Narayanan, Koilpillai, R. David, Venkitesh, Deepa

“…We experimentally demonstrate the simultaneous compensation of both dispersion and nonlinear effects in a 100 km optical fiber link using optical phase…”
Get full text

Optical Phase Conjugation Using Nonlinear SOA for Nonlinearity and Dispersion Compensation of Coherent Multi-Carrier Lightwave Systems by Venkatasubramani, Lakshmi Narayanan, Sobhanan, Aneesh, Vijay, Anirudh, Koilpillai, R. David, Venkitesh, Deepa

“…We study the use of nonlinear semiconductor optical amplifier (SOA) for generating optical phase conjugate towards compensation of distortions in short…”
Get full text

Optical Upconversion of OFDM Signals for Next Generation Fronthauling Using Frequency Doubling and Quadrupling by Sreeraj, S J, Lakshman, B, Ganti, Radhakrishna, Nirmalathas, Ampalavanapillai, Koilpillai, R David, Venkitesh, Deepa

“…Fronthaul data rates in case of mmWave wireless systems scale up to several Gbps in the currently deployed digitized radio over fiber solutions, resulting in…”
Get full text

Widely Linear Filtering for Multiimpairment Compensation in Dispersion Managed mQAM Modulated Optical Systems by Yadav, Rekha, Venkatasubramani, Lakshmi Narayanan, Koilpillai, R. David, Venkitesh, Deepa

“…We propose a blind joint equalization algorithm for M-QAM signals based on a widely linear filtering approach. The proposed scheme jointly compensates for…”
Get full text

Performance of OTFS and OCDM Schemes in Underwater Acoustic Communication Channels by P, Sameer Babu T., Francis, Jobin, Chivurala, Pavan Chandra, David Koilpillai, R.

“…Signaling schemes robust to large Doppler shifts are needed for reliable underwater acoustic (UWA) communication, and orthogonal time frequency space (OTFS)…”
Get full text

Pilot-Free Common Phase Error Estimation for CO-OFDM With Improved Spectral Efficiency by Venkatasubramani, Lakshmi Narayanan, Vijay, Anirudh, Venkitesh, Deepa, Koilpillai, R. David

“…We propose an improved pilot free phase noise mitigation algorithm for COOFDM systems using weighted multi-level QPSK partitioning and Kalman filtering…”
Get full text

Low-complexity algorithms for coherent optical systems with transceiver IQ imbalance by Mir, Sameer Ahmad, Venkatasubramani, Lakshmi Narayanan, Koilpillai, R. David, Venkitesh, Deepa

“…The next-generation coherent optical communication relies on higher symbol transmission rates with higher modulation cardinality. The imbalance between the…”
Get full text

Hybrid-ARQ Protocol for Next Generation Wi-Fi Systems by Shishir, G, Sonigra, Romil, Seshadri, Nambi, Koilpillai, R. David

“…We present and discuss the applications of Hybrid Automatic Repeat Request Protocol (HARQ) in Wi-Fi systems. There has been rapid development in the next…”
Get full text

A Modified MRC Receiver for OTFS Systems with Oversampling by Deconda, Narendra, Seshadri, Nambi, Koilpillai, R. David

“…Orthogonal Time Frequency Space (OTFS) receivers perform joint equalization of all the symbols in an OTFS frame. We consider delay-time domain Maximal Ratio…”
Get full text

Polarization-Insensitive Phase Conjugation of QPSK Signal Using Bragg-Scattering FWM in SOA by Sobhanan, Aneesh, Venkatasubramani, Lakshmi Narayanan, Koilpillai, R. David, Venkitesh, Deepa

“…We experimentally demonstrate polarization-insensitive phase conjugate generation in a semiconductor optical amplifier (SOA) using a counter-propagating and…”
Get full text

Optical Heterodyne Analog Radio-Over-Fiber Link for Millimeter-Wave Wireless Systems by Delmade, Amol, Browning, Colm, Verolet, Theo, Poette, Julien, Farhang, Arman, Elwan, Hamza Hallak, Koilpillai, R David, Aubin, Guy, Lelarge, F, Ramdane, Abderrahim, Venkitesh, Deepa, Barry, Liam P

“…Optical heterodyne analog radio-over-fiber (A-RoF) links provide an efficient solution for future millimeter wave (mm-wave) wireless systems. The phase noise…”
Get full text

Performance analysis of analog IF over fiber fronthaul link with 4G and 5G coexistence by Delmade, Amol, Browning, Colm, Farhang, Arman, Marchetti, Nicola, Doyle, Linda E., Koilpillai, R. David, Barry, Liam P., Venkitesh, Deepa

“…Fifth generation (5G) mobile communications will require a dense deployment of small cell antenna sites and higher channel bandwidth, in conjunction with a…”
Get full text

Studies on CMOS Down-Converter with Double-Balanced Mixer along with Balun at S-Band by Som, Diptapravo, Christopher, S., Koilpillai, R. David

“…A CMOS down-converter with the combination of Gilbert Cell mixer and modified low voltage design technique using LC-balun is demonstrated in this paper. This…”
Get full text

Experimental Demonstration of Multi-channel Frequency Quadrupling for Analog Optical Fronthauling by Sreeraj, S J, Lakshman, B, Ganti, Radhakrishna, Koilpillai, David, Nirmalathas, Ampalavanapillai, Venkitesh, Deepa

“…This paper experimentally demonstrates multichannel frequency quadrupling for analog radio-over-fiber for fronthauling multi-sector antennas in the mmWave…”
Get full text

Wide-band Circular Slot Cut Patch Antenna with Broad Beam-width for X band applications by Gupta, Ritam, Christopher, S, Koilpillai, R. David

“…In this paper, a miniaturised wide-band circular slot cut patch antenna with broad beam width is proposed that can be used for X band applications i.e., radar,…”
Get full text

Compact CMOS Technology-based Phase Shifter Design to Operate in K Band by R, Arthi, Christopher, S., Koilpillai, R. David

“…The design details of K band 6 bit digital phase shifter circuit in 65nm CMOS technology (MMIC) for phased array antennae in general and active phased array…”
Get full text

Modified Widely Linear Filter for Simultaneous Multi-impairment Compensation by Yadav, Rekha, Venkatasubramani, Lakshmi Narayanan, David Koilpillai, R., Venkitesh, Deepa

“…We present a modified widely linear single-tap blind equalizer for the joint multi-impairment compensation of polarization mixing, IQ Imbalance and transceiver…”
Get full text

Theoretical and experimental investigation of the sources of error in stochastic parallel gradient descent-based digital modal decomposition technique by Singh, Karamdeep, Sharma, Priyanka, Suchita, Dixit, Awakash, Srinivasan, Balaji, Koilpillai, R. David, Venkitesh, Deepa

“…A detailed systematic investigation of the accuracy of digital modal decomposition process that uses stochastic parallel gradient descent (SPGD) algorithm is…”
Get full text