Welcome to my Homepage

Suswagatham -- Suswagth -- Welcome -- Willkommen

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The very first research started with the programming of a ALU unit for solving the mathematical function 'log(x)/x'. After designing the data flow and fixing the time schedules, I have written a Verilog code to implement the function.

During my BE course, I have also taken up a small internal project to design and implement a Hamming coder and decoder to demonstrate the short error correcting block codes in digital communications. Then after, I started my research on Turbo-Codes.

International Projects

MEDIAN: This project was sponsored by the 4th Research program of the European Commission (ACTS). Its main goal is to implement a high speed wireless customer premises local area network (WCP-LAN) for multimedia applications upto data rates of 150 Mbit/s. Investigated different synchronization and channel coding algorithms preparing self written C codes for the introduced algorithms, the performance of the complete system in wireless environment has been simulated.

IMT2000: This project being sponsored by the Asahi Chemicals-Japan, deals with the mobile communications of the future generation. Investigated different turbo decoding algorithms with respect to their hardware realisation. Designed a hardware sharing architecture for turbo and convolutional code decoders.

IEEE 802.21: This standard is developing standards to enable handover and interoperability between heterogeneous network types including both 802 and non 802 networks. Contributed couple of concepts.

Further Research Topics

HIPERLAN/2: The status of wireless and cordless are more or less synonymous to the wide and small area networks (eg GSM, DECT). These connections are presently for low data rates, where as the new systems are aiming for high speed data communications. Hiperlan type 2 is an in and out door wireless network where the data rates are between 6 to 54 Mbits/s. It is a broadband radio transmission technology operating at a 5 GHz frequency band.

COVERAGE: This project deals with the extension of the service area of a wireless LAN without any need of an extra access point, thus they are termed as 'Extension Point'. The main requirements on such points are transparency, no network connection, cascadable, compatable, QoS support and naturally low cost.

OFDM: Orthogonal Frequency Division Multiplexing (OFDM) is a method of digital modulation where the bandwidth is split into several narrowband, equally spaced channels at different frequencies, also termed as subcarriers. The use of bandwidth is efficient. OFDM is similar to conventional frequency-division multiplexing (FDM). The difference lies in the way in which the signals are modulated and demodulated. OFDM distributes the information onto many subcarriers, so that the bits on each subcarrier are much longer, drastically reducing inter symbol interference (ISI). For increase in access range and/or data rates, ISI becomes more severe and complex channel equaliser are to be provided for single carrier techniques. As OFDM is capable of dealing with higher data rates for a given bandwidth than either TDMA or CDMA, it is envisioned for the present and future wireless systems. Usually, there is no need of equalisers in the receivers.


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