Statistical channel models based on BER performance are presented for a frequencyand time-selective vehicle-to-vehicle wireless communications link in an expressway environment in Atlanta, Georgia, where both vehicles traveled in the same direction. The models are developed from measurements taken using the direct sequence spread spectrum (DSSS) technique at 2.45 GHz. A collection of tapped del...

In this paper, review to improve the channel estimation accuracy in OFDM system, channel state information is required for signal detection at receiver and its accuracy affects the overall performance of system and it is essential to improve the channel estimation for more reliable communications. A multipleinput multiple-output (MIMO) communication system combined with the orthogonal frequency...

Mammalian DNA polymerase (pol) is a member of the X-family of DNA polymerases and has striking enzymatic and structural similarities to mammalian DNA pol . Because pol provides two important enzymatic activities for base excision repair (BER), we examined whether pol might also contribute to BER. We used extracts from mouse embryonic fibroblasts representing wild-type and null genotypes for pol...

In this contribution, we provide an exact BER analysis for M-QAM transmission over arbitrarily correlated Nakagamim fading channels with maximal-ratio combining (MRC) and imperfect channel estimation at the receiver. Assuming an arbitrary joint fading distribution and a generic pilot-based channel estimation method, we derive an exact BER expression that involves an expectation over (at most) 4...

This paper proposes a new MIMO-OFDM precoding technique that aims to minimize a bit error rate (BER) upper bound of the maximum likelihood detection (MLD) in mobile radio communications. Using a steepest descent algorithm, the proposed method estimates linear precoding matrices that can minimize the upper bound of BER under power constraints. Since the upper bound is derived from all the pairwi...

In this paper, we propose a novel three-time-slot transmission scheme combined with an efficient embedded linear channel equalization (ELCE) technique for the Physical layer Network Coding (PNC). Our transmission scheme, we achieve about 33% increase in the spectral efficiency over the conventional two-time-slot scheme while maintaining the same end-toend BER performance. We derive an exact exp...

An analysis based on a Gaussian approximation of the BER performance for noncoherent optical fiber code-division multiple-access (CDMA) networks (both asynchronous and synchronous) is presented. The effects of shot noise, thermal noise, interference and the architecture of optical receivers are included in the evaluation of the BER. A general equation for the BER is established and it is shown ...

Introduction: Conventionally, the rectangular QAM (R-QAM) BER has been estimated by using various approximations or bounds. Most exact QAM BER results are obtained without taking into account the co-channel interference (CCI) [1, 2]. When CCI is considered, exact BER analyses procedures are performed only for BPSK [3–5] and QPSK [4, 5] systems. Hence, the contribution of this Letter is that we ...

Abstract: In this paper, a theoretical BER analysis of orthogonal frequency division multiplexing combined with time division multiplexing (OFDM/TDM) is presented for joint use of space-time transmit diversity (STTD) and receive antenna diversity with minimum mean square error (MMSE) frequency-domain equalization (FDE). The conditional BER expression is derived, based on a Gaussian approximatio...

This paper investigates the degradation in uncoded BER due to selfinterference ISI caused by nonlinear gain compression and phase rotation in the transmission path. A QPSK scheme is simulated and the probability density functions of the nonlinear distortion effects are analysed with respect to the BER degradation. The results show that AM-AM nonlinearity produces more self-interference ISI and ...