Antenna diversity has been used for many years as a method to mitigate multipath fading. For mobile communications, this has usually been conventionally at the base station, although there is an increasing demand for diversity antennas to be implemented at the mobile. The most common occurrence of this is in the Personal Digital Communications (PDC) network deployed in the Far East (1). Mobile ...

Design diversity has long been known to protect redundant systems against common-mode failures. In this paper, for the first time, we present a metric to quantify diversity among several designs. Based on this metric, we derived analytical reliability models that show a simple relationship between design diversity, system failure rate, and mission time. In addition, we also present simulation r...

Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can provide a better bit error rate (BER) performance than rake combining. However, the residual inter-chip interference (ICI) is produced after MMSE-FDE and this degrades the BER performance. Recently, we showed that frequency-domain ICI cancellation can bring the BER performance close to the theoretica...

Cholera is a severe, water-borne diarrhoeal disease caused by toxin-producing strains of the bacterium Vibrio cholerae. Comparative genomics has revealed 'waves' of cholera transmission and evolution, in which clones are successively replaced over decades and centuries. However, the extent of V. cholerae genetic diversity within an epidemic or even within an individual patient is poorly underst...

In this paper, reverse link capacity, in terms of user capacity, of a code-division multiple access (CDMA) system with both beamforming and antenna diversity under a multipath environment is analyzed and compared. Signal-tointerference ratio (SIR) based power control is assumed in the system. Antenna elements are divided into several groups to achieve antenna diversity gain. Antenna elements in...

We quantify the multiplexing-diversity tradeoff of a multiple-input multiple-output (MIMO) system, when the channel state information (CSI) is known perfectly at the receiver and partially at the transmitter. The partial knowledge of CSI at the transmitter consists of the quantized value of one of the eigenvalues and perfect knowledge of eigenvectors of the channel matrix. The key result is tha...

In this paper, a multi–source multi–relay cooperative wireless network with binary network coding is studied. The system model encompasses: i) a demodulate–and–forward protocol at the relays, where the received packets are forwarded regardless of their reliability; and ii) a maximum–likelihood optimum decoder at the destination, which accounts for possible decoding errors at the relays. An asym...

In this work, we analyze the performance of fullduplex relay selection (FDRS) in spectrum-sharing networks. Contrary to half-duplex relaying, full-duplex relaying (FDR) enables simultaneous listening/forwarding at the secondary relay(s), thereby allowing for a higher spectral efficiency. However, since the source and relay simultaneously transmit in FDR, their superimposed signal at the primary...

.4bsn.err-This paper presents a new diversity scheme for quasi-static wireless RIIMO channels. In the proposed scheme, iin innovative pre-cadingiframing mechanism is employed to translate a multiple-input multiple-output (MIRIO) frequencyselective channel into a mathematically equivalent single-input multiplr-output (SIMO) channel. Consequently, the conventional trellis codes designed for fast ...

We use a recently developed expression for the bivariate Rayleigh cumulative distribution function (CDF) to derive a novel analytical formula for the average signal-to-noise ratio (SNR) of the correlated dual selection combining (SC) system under slow Rayleigh fading. We relate the average SNR diversity gain to spatial correlation as well as to antenna separation. Furthermore, we also develop a...