Sakuntala S. Pillai

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This paper describes the analysis of the audio and speech output of the 16 kb/s Low Delay CELP algorithm (LD-CELP). For various speech file conversions, the SoX (Sound eXchange) tool is used. Praat software is used to extract details regarding the quality of the sound synthesized by the coder. The C program of the coder was compiled using the GCC compiler(More)
Orthogonal frequency division multiplexing (OFDM) has attracted a lot of attention because of its high data rate, high spectrum efficiency and robustness against frequency-selective fading channels This paper addresses channel estimation based on time-domain channel statistics. Here the statistical characteristics of AWGN channel is estimated using(More)
Lasercom or laser communication is an optical wireless communication, envisioned to be the next generation wireless communication technology due to its inherent characteristics like increased bandwidth, high data rate, security, immunity to interference, unregulated spectrum etc. Lasercom is a better alternative to conventional communication schemes due to(More)
Fourth generation cellular networks use Orthogonal Frequency Division Multiple Access (OFDMA) as the multiple access technique. It allows multiple users to transmit simultaneously on different subcarriers per OFDM symbol, thereby reducing the effect of multipath fading. To enhance indoor coverage and reduce traffic within macrocells, femtocells are(More)
Multicarrier modulation systems have become a fast growing field in the modern communication field. The most popular multicarrier modulation technique, OFDM has low bandwidth efficiency due to the insertion of cyclic prefix and poor spectral containment and high narrow band interference due to the use of IFFT. Therefore Filter bank based multicarrier(More)
Orthogonal Frequency Division Multiple Access (OFDMA) is a multiple access technique that can accommodate many users with widely varying applications, data rates and Quality of Service requirements, with increased spectral efficiency. Peak to Average Power Ratio (PAPR) reduction for OFDMA is motivated by a desire to increase the mean transmit power and to(More)
The 3GPP LTE/LTE-A is the most promising technology for next-generation wireless communications providing peak data rates of 1 Gbps. The transmission mode has to be selected properly to improve the overall performance of user communication. The performances of the different transmission modes like single antenna port, transmit diversity, open loop spatial(More)
A MIMO system which is used to achieve high data rate and capacity in transmission medium is one of the significant emerging technologies today. The interferences occurring between the different antenna elements in MIMO OFDM can be mitigated to improve the performance of the system. The precoding technique, where the data is coded and transmitted to reduce(More)