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Ever since "The Word" is perceived as the very "source of life", man has invented
many ways to announce his existence to his immediate neighbors, to the
society at large, and to his kith and kin staying away in distant locations
by freely using the words. It all started with writing, engraving, printing,
radio, telephony, Internet, and finally, nobody knows where it would end with the kind
of the convergence that is today going on between computation and
communication technologies. Research is keeping pace to invent newer and newer means to
improve man's ability to communicate both in terms of speed, quality, and
satisfactionall at an affordable price. India is no exception to this race in research in the
discipline of telecommunication technologies. Indeed, it is fortunate of India that this
time round, it is notunlike during the Industrial Revolution of the
18th centurylagging behind in keeping pace with the western world in its progress in computation
and communication technologies. It is to cater to the needs of these young
scientists and to provide a platform for them to communicate their research results, IUP is launching its Journal of
Telecommunications. We are sure that the academic fraternity will encourage usas they have done in all our
previous endeavorsby availing this facility for publishing their research works. On
our part, we promise to bring out the journal on time with no lapses.
The maiden issue of the journal has six papers. The authors, P A Haris, E
Gopinathan and C K Ali, of the first paper, "Performance of Blind Successive Interference
Canceller for Multi-Carrier CDMA Systems", realizing the need for overcoming the
adverse impact of Inter Symbol Interference (ISI) and Multiple Access Interference
(MAI) for ensuring efficient multiple user access over the wireless channel, have
carried out simulation studies using blind interference cancellation technique for
countering MAI and found it outperforming conventional MF receiver and BMMSE
receiver, thereby increasing the potential of the system to handle more number of users.
The authors, K Jayanthi and P Dananjayan, of the next paper, "A Novel
Link Adaptation Scheme for Wideband CDMA", have proposed a novel link
adaptation scheme for obtaining target quality in terms of Bit Error Rate (BER) in
multi-user Wideband Code Division Multiple Access (WCDMA) systems. They have
analyzed its performance using two popular control algorithms for comparing the
proposed power control algorithm and found that the proposed algorithm provides
relatively a better system performance in terms of outage probability, convergence time
and consumption.
The authors, G Indumathi and K Murugesan, of the next paper, "Diverse
QoS Support of Multiclass Data Services Using Cross-Layer Scheduling", have
designed a cross-layer priority and fair scheduling algorithms, taking into consideration
the channel qualities at the physical layer and users' packet queuing delay at the
data link layer, and found from the data obtained from the simulation that the
proposed scheduling algorithms have provided more Quality of Service (QoS) in terms
of throughput and delay in priority scheduling. The results have also indicated
that better performance measure can be achieved when validated with NS2 simulations.
The authors, V Mathuranathan, M N Satyanarayan and Shikha Tripathi, of
the next paper, "DSP Implementation of QPSK and 8-QAM Transmitter for
Software Defined Radio", present a software-defined transmitter capable of switching
between Quadrature Phase Shift Keying (QPSK) and 8-Quadrature Amplitude
Modulation (QAM) techniques by using a common oscillator which gives quadrature outputs
at equal amplitudes. A single coupled standard quadrature recursive oscillator
has been used in the design. The results obtained were found to be in accordance
with the simulation and theoretical analysis.
The last two papers are reviews. In the first review, "Global GNSS
Multi-Constellation Scenario: Present and Future", the authors, S Mariappan,
Swarna Ravindra Babu and G Sasi Bhusana Rao, have presented the existing
constellations, constellations likely to emerge, signal spectrum and structures of some of the
civil navigation signals, and accuracy optimization techniques, along with a
discussion on issues such as compatibility and interoperability in a multi-constellation
scenario. In the second review, "A Survey of VLSI Architectures for FFT Computation in
Signal and Image Processing Applications", the authors, Chandan Kumar Jha, M
Suresh and A K Panda, have surveyed VLSI architectures that have already been
reported for computation of FFT in signal and image processing applications. The
authors have also discussed the importance of using CORDIC algorithms for design
and implementation of VLSI architecture to meet the growing demands under high
speed multimedia technology.
-- GRK Murty
Consulting Editor |
