Physical-layer network coding (PLNC) has the ability to drastically improve the throughput of multi-source wireless communication systems. In this paper, we focus on the problem of channel tracking in a Decode-and-Forward (DF) OFDM PLNC system. We proposed a Kalman Filter-based algorithm for tracking the frequency/time fading channel in this system. Tracking of the channel is performed in the t...

Future mobile communications is required to provide data transmission with higher rates and more reliability than current systems. As a solution to this problem, the diversity transmission using Alamouti’s space time block coding (STBC)[1] has been adopted in several wireless standard due to its attractive features such as full spatial diversity at full transmission rate. Usually, it requires c...

This article presents an ultra-compact and highthroughput reconfigurable architecture for implementing an efficient fading channel simulator that supports a relatively large number of propagation paths. To closely reflect actual radio signal propagation conditions, we used a recently improved Rayleigh and Ricean fading channel model based on the sumof-sinusoids technique. The improved model is ...

The performance of direct-sequence code division multiple access (DS-CDMA) using space– time spreading system, over frequency-selective fading channels, is investigated. The underlying transmit diversity scheme, previously introduced in the literature, is based on two transmit and one receive antenna. It was shown that when employed in flat fast-fading channels, the received signal quality can ...

Introduction: In this paper, we study the design of space–time codes for frequency selective quasi-static fading channels with nonnegligible ISI. It has been shown by Tarokh et al. [1] that the achievable diversity of a space– time code designed for flat fading channel is not reduced if it is used in a frequency selective fading channel. However, a full diversity space-time code designed for fl...

Analysis of Coded OFDM System over Frequency-Selective Fading Channels. (August 2003) Jun Zheng, B.S., Tsinghua University, P.R. China Chair of Advisory Committee: Dr. Scott L. Miller This thesis considers the analysis of system performance and resource allocation for a coded OFDM system over frequency selective fading channels. Due to the inseparable role taken by channel coding in a coded OFD...

One of the options to mitigate fading effects in mobile communication is adaptive transmitter gain. This paper proposes a simple technique to eliminate the effects of fading in different multi antenna set-ups by varying the transmitter gain. The multi antenna set-ups considered in this paper include Single input-single output (SISO), Single input-multi output (SIMO), Multi input-single output (...

Abstract In this paper hybrid ARQ is applied to DS-CDMA with minimum mean square error frequency-domain equalization (MMSE-FDE). The throughput of turbo-coded HARQ is evaluated in addition to the packet error rate (PER). DS-CDMA with MMSE-FDE can provide much better PER performance than with rake combining in a frequency-selective fading channel and the performance improves with the increase in...

Abstract The multiple-access interference (MAI) limits the performance of the DS-CDMA uplink transmission. 2D OVSF spread/chip-interleaved DS-CDMA is an MAI-free system, and hence single-user coherent frequency-domain equalization (FDE) can be used instead of complicated multiuser detection (MUD). However, coherent FDE needs channel estimation. Pilot-assisted channel estimation is not reliable ...

Frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can replace the conventional rake combining to significantly improve the bit error rate (BER) performance in a frequency-selective fading channel. MMSE-FDE requires an accurate estimate of the channel transfer function and the signal-to-noise power ratio (SNR). Direct application of pilot-assisted channel es...