Prior treatments of space-time communications in Rayleigh flat fading generally assume that channel coding covers either one fading interval-in which case there is a nonzero “outage capacity”or multiple fading intervals-in which case there is a nonzero Shannon capacity. However, we establish conditions under which channel codes span only one fading interval and yet are arbitrarily reliable. In ...

In this paper, a new adaptive transmit diversity selection (ATDS) scheme is proposed for future wireless communication system to provide high spectral efficiency (SE) and good quality of service (QOS) .The ATDS scheme selects the space time block code (STBC) orthogonal frequency division multiplexing (OFDM) scheme for flat fading channel and it selects space frequency block code (SFBC) OFDM sch...

The performance of turbo-coded asynchronous direct sequence code division multiple access (DS-CDMA) using long and short spreading sequences is compared by both analysis and simulation. For coded systems with a conventional matched filter (MF) receiver, three analytical methods with different complexity are compared: the standard Gaussian approximation, the improved Gaussian approximation (IGA)...

Alexander Lampe, and Johannes B. Huber Telecommunications Institute II, University of Erlangen Cauerstraße 7/NT, D–91058 Erlangen, Germany Phone: +49-9131-85 27114, Fax: +49-9131-85 28919, Email: [email protected] Abstra t | In this paper we investigate the synchronous transmission over time–variant multipath Rayleigh–fading channels employing Direct Sequence Code Division Multiple Access (DS–CDMA)...

We propose a new training based scheme for multiple antenna broadcast channels consisting of a base station (transmitter) and many users (receivers) in a flat fading environment. Both the transmitter and the users transmit at a common carrier frequency so that, by virtue of reciprocity, the downlink and uplink propagation matrices are equal. We show that by using appropriate training the base s...

The effects of performing channel estimation in AWGN and Rayleigh channels using non-ideal interpolating and decimating filters on an OFDM system are investigated. Pilots are used to estimate the combined response of the channel and the filters. By making use of standard Gaussian approximation to the interference for the AWGN channel, we illustrate how to estimate the symbol error rate of a M-Q...

Efficient simulation models for correlated Nakagami-m fading channels are required for the development, performance evaluation and validation of diversity combining systems in general fading channels. We propose a theoretical explanation of the Nakagami-m distribution, as a natural extension of the Rayleigh fading model. In this model, a Nakagami random variable is viewed as the norm of an mdim...

A Wireless Sensor Network (WSN) consists of a hundred of sensor nodes deployed in sensing fields in order to serve various applications. The limited resources of sensor nodes such as energy source, computational ability and communication bandwidth are the most important challenges in designing a reliable smart WSN which guarantees the connectivity and maximizes the lifetime of sensor’s batterie...

In this paper we estimate the performance of 2*3 MIMO-MC-CDMA system using convolution code in MATLAB which highly reduces BER by increasing the efficiency of system. MIMO and MC-CDMA system combination is used to reduce bit error rate and also for forming a new system called MC-CDMA which is multi user and multiple access schemes used to increase the performance of the system. MC-CDMA system i...

This paper presents a Multiple-Input Multiple-Output (MIMO) transmission scheme that combines the spatial modulation (SM) with MIMO spatial multiplexing technique. The SM uses NA number of active antennas to transmit the same symbol, the proposed MIMO model uses the NA number of active antennas to transmit different symbols at the same time to increases the spectral efficiency of the system. A ...