Prerana Poddar

Prerana Poddar
BMS College of Engineering · Department of Electronics and Communication Engineering

PhD

About

24
Publications
1,117
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126
Citations

Publications

Publications (24)
Article
Full-text available
The underwater (UW) acoustic channel poses multiple challenges like coloured ambient noise, frequency‐dependent attenuation, and doubly selective fading. The availability of a robust underwater communication mechanism can largely enhance the success of human effort in a multitude of applications, ranging from pollution surveillance to defence and s...
Article
Full-text available
The wireless fading channel creates unknown impairments on the transmitted signal. Multiple antenna systems have been well studied for providing diversity and/or coding gain over fading channels. In this paper, a new simpler form of signaling scheme is developed for Multiple Input Multiple Output(MIMO) channels. At the receiver, minimum Pearson dis...
Chapter
In multiple antenna systems like Multiple Input Single Output (MISO) or Multiple Input Multiple Output (MIMO), the transmitted signal gets distorted due to various factors such as channel fading, multipath propagation, mobility and transmission bandwidth. Using the concepts of differential signalling and permutation modulation which were developed...
Article
One of the major limitations of Orthogonal Frequency Division Multiplexing (OFDM) signal is high Peak-to-Average-Power-Ratio (PAPR). Non-linear companding transforms that expand small signals and compress the peak signals reduce the PAPR significantly. The proposed companding scheme transforms the Rayleigh distributed probability distribution funct...
Article
Full-text available
The major challenge with multimedia communication lies in the demand for higher data rates with better quality of service and lower latency over the wireless channel. Multimedia content is usually source encoded with variable length codes (VLCs) for optimizing bandwidth utilization. VLCs, even though uniquely decodable, suffer from the problem of e...
Article
A simple and efficient method for communication of text information using joint source-channel coding is presented in this paper. The information is encoded by the use of symmetric reversible variable length code and corresponding header sequence is generated. The header information, headers and codewords forms a frame. Since the header plays a cru...
Article
Orthogonal frequency division multiplexing (OFDM) is an attractive multicarrier modulation scheme, but it suffers from the problem of high peak-to-average power ratio (PAPR). Selected mapping (SLM) and partial transmit sequences (PTS) are two well known, distortion-less techniques with good PAPR reduction capabilities. But, both the methods require...
Article
Intercarrier interference (ICI) self-cancellation, new ICI self-cancellation and conjugate cancellation schemes have been proposed in the literature to mitigate the effect of ICI. In this paper we have performed the mathematical analysis of PAPR performances for ICI self-cancellation, new ICI self-cancellation and ICI conjugate cancellation schemes...
Article
A major drawback of orthogonal frequency division multiplexing (OFDM) is high peak-to-average power ratio (PAPR). An OFDM signal with high PAPR requires power amplifierʼs (PAs) with large linear operating ranges but such PAs are difficult to design and costly to manufacture. Therefore, to reduce PAPR various methods have been proposed. One of the e...
Article
Selected mapping (SLM) is an attractive, non-distortion technique to reduce the PAPR of OFDM signal. The conventional SLM method requires the transmission of side information i.e. the index of the selected signal (with lowest PAPR) with each OFDM symbol. This leads to reduction in data rate loss. In this paper we have proposed two new phase sequenc...
Article
A major drawback of orthogonal frequency division multiplexing (OFDM) is its high peak-to-average power ratio (PAPR), which necessitates the use of expensive power amplifiers with a large operating range. Partial transmit sequence (PTS) is one of the existing techniques to reduce PAPR but it requires side information (SI) to be transmitted with dat...
Article
The combination of Space–Time Coded Multiple Input Multiple Output systems (STC-MIMO) with Orthogonal Frequency Division Multiplexing (OFDM) is recently being investigated as an effective means of providing high-speed data transmission over dispersive wireless channels. The strengths of the two techniques coalesce and render MIMO-OFDM systems robus...
Article
Orthogonal frequency division multiplexing (OFDM) technique, when used in wireless environments, is known to be robust against frequency selective fading. However, when the channel shows time selective fading, rapid variations destroy the subcarrier orthogonality and introduce inter-carrier interference (ICI). The use of ICI mitigation schemes requ...
Article
The use of orthogonal frequency division multiplexing (OFDM) in frequency-selective fading environments has been well explored. However, OFDM is more prone to time-selective fading compared with single-carrier systems. Rapid time variations destroy the subcarrier orthogonality and introduce inter-carrier interference (ICI). Besides this, obtaining...
Conference Paper
Accurate estimation of time-varying wireless channels is a difficult task in orthogonal frequency division multiplexing (OFDM) systems. Pilot based techniques have normally been employed for channel estimation. However, for time varying channels, pilot symbols need to be transmitted periodically to overcome the effect of time selective fading. Expe...
Conference Paper
The use of orthogonal frequency division multiplexing (OFDM) in frequency selective fading environments has been well explored. However, OFDM is more prone to time selective fading as compared to single carrier systems. Rapid time variations destroy the subcarrier orthogonality and introduce inter-carrier interference (ICI). Besides this, obtaining...

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