Suppression of multiuser interference (MUI) and mitigation of multipath effects constitute major challenges in the design of third-generation wireless mobile systems. Most wideband and multicarrier uplink CDMA schemes suppress MUI statistically in the presence of unknown multipath. For fading resistance, they all rely on transmitor receive-diversity and multichannel equalization based on bandwi...

A theoretical characterization of intracell and intercell interference statistics in cellular direct-sequence code-division multiple-access systems in a multipath environment is presented considering both fast and slow power control. Unlike many of the previous papers, mobiles are assumed to connect to a base station according to a minimum attenuation criterion, also known as base station diver...

This paper derives equations that describe level-crossing rates and average fade durations for mobile receivers operating in spatially complicated multipath channels. The results are useful for describing fading statistics for wireless systems that operate in realistic propagation channels or employ smart antennas, adaptive arrays, or other technologies that lead to a non-omnidirectional distri...

A continuous adaptive modulation multitone system for multipath fading channels is shown. To obtain a target BER and maximum aggregated rate, each subcarrier bit rate is modified independently to adjust the transmitted signal to the spectral channel shape and to track the channel variations dynamically. Spectral efficiency and the required feedback channel capacity are obtained through simulati...

Abstract— The direct sequence-code division multiple accesses (DS-CDMA) signals are transmitted over multipath channels that introduce fading and shadowing. Combined effect of multipath fading and shadowing along with multiple access interference (MAI) and inter-symbol interference (ISI) worsens the system performance. Further, experimental results have confirmed the presence of impulsive nonGa...

In this paper, we investigate the estimation of multipath parameters and prediction of wideband multipath fading channels for mobile-to-mobile wireless communications. Based on a statistical model for mobile to mobile urban and suburban channels, we derive a parametrized model and utilize two-dimensional ESPRIT algorithm to jointly estimate the delay of arrival (DOA) and effective Doppler frequ...

Abslloct-Many wimles, systems exploit transmit diversity for mom reliable detection ofsignals at the receiver. To nrrompUsh this, ceding ls spread acms multiple trsormit anteomas. An erample of this is the well known “Alamauti transmit diversity”, whcm B very simple eodiag scheme acmss multiple tramsmit iotennas allows systems to attain performance similar to systems with multiple receive snten...

This paper analyzes the error performance of multiple-input multiple-output (MIMO) systems in frequencyselective Rayleigh fading channels. A zero-forcing (ZF) receiver is applied to separate transmitted data streams for each resolvable multipath component. The decision for each symbol of a transmitted data stream is based on combining L zero-forced multipath components carrying information of t...

In this paper we review the most peculiar and interesting information-theoretic and communications features of fading channels. We first describe the statistical models of fading channels which are frequently used in the analysis and design of communication systems. Next, we focus on the information theory of fading channels, by emphasizing capacity as the most important performance measure. Bo...

The paper presents a technique to transmit 16QAM signals in mobile radio environments. The conventional method for compensating the multipath fading e ect using pilot symbol assisted modulation (PSAM) is extended, employing not only the pilot symbols but also the previously estimated fading values for evaluating the fading in the current frame. The main results of this paper are the symbol erro...