The Discrete Multi Tone (DMT) modulation is considered a viable technique for high-speed digital transmission over subscriber loop. It was selected as the standard for ADSL modems and it is also a strong candidate in the VDSL area. This paper investigates a programmable solution for the DMT based VDSL modems using Texas Instrument processor family TMS320C62xx. A structure for both transmitter a...

In this work we consider the uplink scenario of a single cell multi carrier code division multiple access (MCCDMA) in which the channel between a given user and the base station receiver is assumed known and stable for the duration of the transmission. We propose an algorithm that uses the greedy interference avoidance method as well as power update to adapt the transmitter waveform of users. T...

UART (Universal Asynchronous Receiver Transmitter) is used for serial communication. It is used for long distance and low cost process for transfer of data between pc and its devices. In general a UART operated with specific baud rate. To meet the complex communication demands it is not sufficient. To overcome this difficulty a multi channel UART is proposed in this paper. And the whole design ...

NTT DOCOMO Technical Journal Vol. 10 No. 4 *1 MIMO: A signal transmission technology that uses multiple antennas at both the transmitter and receiver to perform spatial multiplexing and improve communication quality and spectral efficiency. *2 Beam forming: A method for improving signal separation performance at the receiving side by doing precoding on the transmitting side based on channel dat...

Orthogonal frequency division multiplexing (OFDM) is an attractive multi carrier modulation technique for future broadband wireless transmission systems. However, the OFDM system exhibits high peak to average power ratio (PAPR) , large computational complexity by applying discrete Fourier transform (DFT) at the transmitter and inverse DFT (IDFT) at the receiver and sensitivity to carrier freque...

Fig. 1. Inter-chip wireless communication within computer chassis Impulse radio systems have received much attention as a possible architecture for UWB transceivers due to the large data bandwidth, low spectral interference with nearby channels, and simplicity of UWB transmitter/receiver architectures using mostly digital implementations. Due to the low emitted power spectral density of -41.3dB...

In this paper, Tomlinson-Harashima precoding, a nonlinear pre-equalization technique, is proposed for transmission over multiple-input/multiple-output channels. Instead of equalizing intersymbol interference (temporal equalization) here spatial equalization, i.e., equalization of multi-user interference is performed. If only a low-rate backward channel is available for communicating channel sta...

On bi-static or multi-static space-borne radar the appropriate digital beam-former (DBF) algorithms can obtain multi-angular synthetic aperture radar (SAR) data and enhance signal-tonoise ratio. Some applications ask for short revisit time that need to ensure seamless coverage to obtain a wide swath SAR image data with a single satellite using digital beam-forming on receive scheme [1]. The tra...

Multi-Radio Multi-Channel Wireless mesh networks (MRMC WMNs) is the self-configuring backhaul providing internet access for last mile users through multi-hop forwarding. The increasing demand for low cost wireless networks coverage has motivated a high interest in multi-hop communications based recent and significant IEEE 802.11s WMN standard. One of the main challenges being faced by WMN is co...

An ESM sensor composed of either a single channel or multi channel superhetrodyne receiver followed by Digital receiver and ELINT processor to identify radar emitters in a particular frequency band of interest. In real life, such systems may encounter with a continuous stream of pulses accompanied by many imperfections, and it should work on real-time basis. In order to handle such circumstance...