Sibasish Das

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—For communication over doubly dispersive channels, we consider the design of multicarrier modulation (MCM) schemes based on time–frequency shifts of prototype pulses. We consider the case where the receiver knows the channel state and the transmitter knows the channel statistics (e.g., delay spread and Doppler spread) but not the channel state. Previous(More)
6.1 Introduction As discussed in Chapter 1, the wireless communication channel can be modeled as a time-varying (TV) linear 1 system whose output is corrupted by additive noise. To reliably recover the transmitted information from the channel output, the receiver must address the effects of both linear distortion and additive noise. While, in theory, the(More)
— There is a growing demand for higher data rate systems that can function in a highly mobile environment. This mandates designs suited to doubly selective channels. This paper presents a pulse-shaped frequency-division multiplexing (PS-FDM) scheme for transmission over doubly-dispersive channels. The pulse shapes are designed to yield an inter-symbol(More)
— Multi-carrier modulation (MCM) is widely studied as a communication technique for time-and frequency selective (hence, doubly selective) channels. MCM schemes are usually designed either to reduce decoding complexity, to exploit diversity gains, or to enhance spectral efficiency. However, no known scheme accounts for all three concerns. In this paper, we(More)
—For noncoherent communication over fading channels , pilot-aided transmission is a practical scheme which allows the receiver to compute channel estimates for subsequent use in coherent decoding. We propose an improved scheme whereby the transmitter interleaves several pilot substreams with independently-coded data substreams to facilitate successive(More)
In the near future, the need for portable multi-antenna wireless devices supporting high data-rates in a harsh mobile environment is anticipated. Typically, in this scenario , the underlying wireless channels are time-and frequency selective, hence doubly selective (DS). Multicarrier modulation (MCM) schemes, wherein a stream of data is split into(More)
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