Orthogonal Frequency Division Multiple Access (OFDMA) has been selected as the multiple access technique to meet the growth of cellular subscribers and the need for faster and more reliable data services. The fundamental in OFDMA femtocell network is the interference management. When femtocell is deployed in the existing macrocell network, there will be a… (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)
Single Carrier Frequency-Domain Equalization is one of the emerging technologies in broadband wireless systems. It requires reliable channel estimates to maintain an acceptable bit error rate performance. A two-dimensional MMSE channel estimation (2D-MMSE) algorithm along with blind channel equalization based on improved channel estimation is proposed in… (More)
— In Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM systems, symbol timing synchronization is important inorder to find an estimate of where the symbol starts. In this paper, an efficient preamble structure is proposed for improving the timing synchronization in MIMO-OFDM systems. The proposed short preamble consists… (More)
IEEE 802.15.4 standard was especially designed to provide specifications for simple, low data rate, ultra low power and economical wireless personal area networks (WPANs). By exploiting the 16 non-interfering channels supported by IEEE 802.15.4, we can improve the channel capacity of wireless sensor networks. This paper analyses the performance of a channel… (More)
and CELP produce comparable quality while the quality of LD-CELP coder is much higher, at the expense of higher bit rate.
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)