Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Author: search.filters.author.Prashantha Kumar, H.

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    Soft decision decoding of Davydov-Tombak codes using a parity check tree
    (2010) Prashantha Kumar, H.; Sripati, U.; Rajesh Shetty, K.; Shankarananda, B.
    Davydov and Tombak have designed an excellent single error correction-double error detection (SEC-DED) code that appears to be more capable of detecting triple and quadruple errors than the conventional Hamming SEC-DED codes. These codes have been applied to memory subsystems and digital storage devices in order to achieve efficient and reliable data processing and storage. A new approach to soft decision decoding of Davydov-Tombak codes using a parity check tree associated with the Tanner graph is presented. For the AWGN channel, gains in excess of 1.6dB at reasonable bit error rates with respect to conventional hard decision decoding are demonstrated for the (40, 33), (37, 30), (35, 28) and (72, 64) Davydov-Tombak codes. ©2010 IEEE.
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    Synthesis of BCH codes for enhancing data integrity in flash memories
    (2010) Rajesh Shetty, K.; Sripati, U.; Prashantha Kumar, H.; Shankarananda, B.
    Flash memories have found extensive application for use in portable storage devices. They have been used for code storage as well as data storage. The storage density associated with these devices has increased tremendously in the past few years. This has necessitated very dense packing of data bits on the device. This gives rise to increased Raw Bit Error Rate (RBER) as a result of Inter Symbol Interference (ISI) between bits stored in adjacent cells. This necessitates the use of powerful error control codes to guarantee information integrity. With the increase in density of data storage, the raw bit error rate (RBER) associated with the storage device increases. Error Control Coding (ECC) can be used to reduce the RBER to acceptable values so that these devices can be employed to store information in applications where data corruption is unacceptable. In this paper, we describe the synthesis of BCH codes based on memory models proposed by the semiconductor industry. These codes have better error correcting capability than the codes used in current practice. ©2010 IEEE.
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    Adaptive receive-antenna selection technique for Spatial Modulation MIMO systems
    (Institute of Electrical and Electronics Engineers Inc., 2015) Neha, N.; Koila, S.; Prashantha Kumar, H.; Sripati, U.
    In this paper, we propose an adaptive receive antenna selection technique for Spatial Modulation (SM) MIMO systems. The proposed method is simple and uses channel state information (CSI) available at the receiver to choose the best subset of active receive antennas among the available Nr receive antennas. Simulation results show that SM MIMO system with the proposed receive antenna selection scheme provides a performance gain of approximately 5 dB over conventional SM system (SM MIMO system without antenna selection). The proposed scheme does not increase the RF chain requirement at the receiver and retains all the benefits of SM MIMO. © 2015 IEEE.
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    Target Estimation Performance Improvement in Cooperative Radar and Communication system Spectrum Sharing
    (Institute of Electrical and Electronics Engineers Inc., 2021) Gunnery, S.; Pardhasaradhi, B.; Prashantha Kumar, H.; Srihari, P.
    This paper presents target estimation performance improvement in cooperative radar and communication system spectrum sharing system model. Due to cooperation, target returns results from the communication transmitter are also exploited to improve the target estimation performance. Further, Cramer-Rao Lower Bound (CRLB) is considered as a metric to evaluate the target estimation performance. In addition, the effect of transmitting energy and target reflection coefficient on CRLB is analyzed. The cooperative system model is compared with the non-cooperative radar and communication system spectrum sharing operation and stand-alone radar system operation. Results show that the cooperative radar and communication system spectrum sharing system model provides improved performance compared to non-cooperative and stand-alone operations. © 2021 IEEE.
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    Power Amplifier for front-end WiFi-6E application
    (Institute of Electrical and Electronics Engineers Inc., 2024) Pawankumar, B.; Prashantha Kumar, H.
    This paper proposes a dual-band Power Amplifier (PA) suited to WLAN 802.11ax applications in wireless communication. Operating in frequency range of 5GHz to 7GHz, the PA employs a single-transistor design biased in a class-AB configuration. Implemented using UMC 65nm CMOS PDK, the compact layout inclusive of pad frames occupies an area of 880µm ×418µm (0.37mm2). For continuous wave (CW) source, post-layout simulation offers a gain of 11.2dB, output saturated power of 20.8dB and a Power Added Efficiency (PAE) of 20.8%. For 802.11ax MCS-11 signals, linear power output (Pavg) exceeds 12dBm at Error Vector Magnitude (EVM) =-35dB across the 5GHz and 6GHz bands. Unlike most literature that predominantly focuses on WLAN PA studies up to 6GHz, this paper extends the investigation up to 7.050GHz suitable for WiFi-6E application. © 2024 IEEE.