Discrete-time noncoherent Rayleigh fading multiple-input multiple-output (MIMO) channels are considered, with no channel state information at either the transmitter or the receiver. The fading is assumed to be correlated in time and independent from antenna to antenna. Peak and average transmit power constraints are imposed, either on the sum over antennas, or on each individual antenna. In bot...

Sensing coverage problem in wireless sensor networks is a measure of quality of service (QoS). Coverage refers to how well a sensing field is monitored or tracked by the sensors. Aim of the paper is to have a priori estimate for number of sensors to be deployed in a harsh environment to achieve desired coverage. We have proposed a new sensing channel model that considers combined impact of shad...

A loss of subchannel orthogonality due to timevariant multipath channels in orthogonal frequency-division multiplexing (OFDM) systems leads to interchannel interference (ICI) which increases the error floor in proportion to the Doppler frequency. In this paper, a simple frequency-domain equalization technique which can compensate for the effect of ICI in a multipath fading channel is proposed. ...

Ultra-wideband (UWB) is a widely used technology in wireless indoor positioning. However, Non-line-of-sight (NLOS) and complex multipath fading introduce positioning errors to the UWB system. In order alleviate influence of non-line-of-sight fading, channel-quality-evaluation-based method proposed this paper. method, qualities channel between unknown nodes anchor are evaluated by weighted equat...

At the basic RF-channel level, DRM shares many characteristics with other modern systems such as DVB-T and DAB. It utilises Coded Orthogonal Frequency Division Multiplexing (COFDM) [1][2] to combat noise, narrowband fading and multipath. Broadcasts can be synchronized to support Single-Frequency Networks (SFNs) and Multi-Frequency Networks (MFNs). One DRM service normally occupies one AM channe...

This paper presents the average error probability performance in coherent DS-CDMA systems using a 2DRAKE receiver with an arbitrary number of antennas and arbitrary number of RAKE fingers. In the analysis, we assume a general frequency selective Nakagami-m fading channel with exponential Multipath Intensity Profile. Analytical expression of the average Bit-Error-Rate (BER) is derived, including...

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...

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...

Macrodiversity system with macrodiversity selection combining (SC) receiver and two microdiversity SC receivers is considered. Received signal is affected simultaneously to Gamma long term fading and Rician short term fading resulting in system performance degradation. Macrodiversity SC receiver reduces Gamma shadowing effects and microdiversity SC receivers reduce multipath fading effects on b...

In this paper, the problem of estimating the channel parameters of a new user in a multiuser code-division multiple-access (CDMA) communication system is addressed. It is assumed that the new user transmits training data over a slowly fading multipath channel. The proposed algorithm is based on maximumlikelihood estimation of the channel parameters. First, an asymptotic expression for the likel...