Research FieldDr. S. M. Riazul Islam's research field is Wireless Communication in general and Ultra-Wideband (UWB) in particular. More specifically, he works on the PHY layer in wireles personal area network (WPAN) and the topics include Channel estimation for high rate UWB systems (MB-OFDM), Interference mitigation in MB-OFDM systems, Radio resource management (power control), Signal processing in UWB communications and so on. Additionally, he works on MAC protocol in wireless body area network (WBAN) and wireless sensor network (WSN), Low power MAC for WBAN ,Energy-saving MAC for WSN, Wake-up radio in WBAN/WSN.
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UWB and Channel Estimation
Ultra-wideband (UWB) technology has been well documented as a most suitable candidate for short-range multiple access communications. Reasons they are preferred include potential for high data rate, low susceptibility to multi-path interference, potential small size and processing power, together with low equipment cost as well as high precision ranging and localization. UWB technology can enable a wide variety of applications in wireless communications, networking, radar imaging and localization systems. UWB was traditionally accepted as a pulse radio, but the federal communications commission (FCC) and international telecommunication union (ITU) now define UWB in terms of a transmission from an antenna for which the emitted signal bandwidth exceeds the lesser of 500 MHz or 20% of the center frequency. Thus, pulse-based systems—wherein each transmitted pulse instantaneously occupies the UWB bandwidth, or an aggregation of at least 500 MHz worth of narrowband carriers, for example in orthogonal frequency division multiplexing (OFDM)—can gain access to the UWB spectrum under the rules. UWB technology employing OFDM is termed multi-band (MB-OFDM) UWB. The popularity of MB-OFDM UWB system continues to grow as the physical layer (PHY) of wireless personal area network (WPAN), especially for high data rate applications in home networks. MB-OFDM has already been taken in the standard ECMA-368 for high rate UWB. Interested readers are referred to this online page for few references to get more knowledge about UWB systems.
Channel Estimation: The radio channel in mobile radio systems is usually multi-path fading channel that causes intersymbol interference (ISI) in the received signal. Many kinds of equalizers can be used to remove the ISI from the signal. However, these detectors require knowledge on the channel impulse response (CIR) that can be provided by a separate channel estimator. A mathematical and/or statistical method building the channel estimator is termed the channel estimation technique. This technique allows the receiver to approximate the impulse response of the channel and explain the behavior of the channel. So, channel estimation is essential in order to have successful information decoding in the receiving side of the communication system.
Channel Estimation: The radio channel in mobile radio systems is usually multi-path fading channel that causes intersymbol interference (ISI) in the received signal. Many kinds of equalizers can be used to remove the ISI from the signal. However, these detectors require knowledge on the channel impulse response (CIR) that can be provided by a separate channel estimator. A mathematical and/or statistical method building the channel estimator is termed the channel estimation technique. This technique allows the receiver to approximate the impulse response of the channel and explain the behavior of the channel. So, channel estimation is essential in order to have successful information decoding in the receiving side of the communication system.
