Diversity combining techniques play an important role in combating the destructive effects of channel fading in wireless communication systems. In this work we present a blind diversity combining technique for Rayleigh flat fading channels based on Hammerstein type filters. We show that the performance of this technique is very close to ideal MRC system which is accepted as an optimum receiver ...

This paper compares the vnode architecture found in SunOS with the internal file system interfaces used in the Sprite distributed file system implementation. The emphasis of the comparison is on generalized support for remote access to file system resources, which include peripheral devices and IPC communication channels as well as regular files. A strong separation of the internal naming and I...

In wireless communication, multiplexing & multiple access concept is most important. In most communication systems require, sharing of channels. In Multiple Access techniques types such as FDMA, TDMA, CDMA, & OFDM. OFDM based transmission system uses CP in an MB-OFDM symbol in order to maintain the orthogonality of Trasmission.Present days ultra-wideband systems use multi-band OFDM techniques f...

In cognitive radio networks, secondary users exchange control information to utilize the available channels efficiently, to maintain connectivity, to negotiate for data communication such as sender-receiver handshakes, for neighbor discovery etc. This task is not trivial in cognitive radio networks due to the dynamic nature of network environment. Generally, this problem is tackled by using two...

There is disparity in access to Information and Communication Technologies between male and female especially in developing countries. This study did a gender analysis of access and use of ICTs in Ekiti state, Nigeria. Multistage sampling procedure was used to select 178 respondents. Data collected were analysed using descriptive statistics and t-test at α0.05. Radio (198.7), mobile phones (186...

Sparse code multiple access (SCMA) is a promising multiuser communication technique for the enabling of future massive machine-type networks. Unlike existing codebook design schemes assuming uniform power allocation, we present novel class SCMA codebooks which display imbalance among different users downlink transmission. Based on Star-QAM mother constellation structure and with aid genetic alg...

This paper studies media access protocols which support collision-free broadcast/multi-cast communication for optically connected star-coupled systems with Wavelength Division Multiple Access channels. An early hybrid access protocol, consisting of reservation and of receiver channels pre-allocation, allows reservation for exactly one WDM channel per node during the reservation phase. We extend...