This paper presents a semi-analytical approximation of Symbol Error Rate (SER) for the well known LoRa Internet Things (IoT) modulation scheme in following two scenarios: 1) multi-path frequency selective fading channel with Additive White Gaussian Noise (AW GN) and 2) presence second interfering user flat-fading AW GN channel. Performances both coherent non-coherent cases are derived by consid...

We study coherent binary direct-sequence code division multiple access (DS-CDMA) systems operating over frequency-selective Nakagami fading channels. In particular a performance comparison between maximal-ratio combining (MRC) and equal-gain combining (EGC) RAKE receivers is considered. For interference limited systems, perfect MRC RAKE receivers can accommodate about 5m=(5m ? 1) more users tha...

Recently, space-time block coding has emerged as a promising spatial transmit diversity scheme, mainly due to its simple decoding complexity. As it was initially proposed, spacetime block coding was based on the assumption of flat multipath fading channel, where there is no intersymbol interference. In this paper, we investigate the performance of two different receiver proposals using space-ti...

Transmit antenna diversity has been exploited recently to develop high performance space-time coders and simple maximum-likelihood decoders for transmissions over known at fading channels. Relying on block precoding, this paper develops generalized space-time coded multicarrier transceivers appropriate for wireless propagation over frequency-selective (and perhaps unknown) multipath channels. M...

Abstract In a frequency-selective fading channel, the performance of single-carrier (SC) transmission significantly degrades due to severe inter-symbol-interference (ISI). In this paper, delay transmit diversity and space-time transmit diversity (STTD) as transmit diversity are combined with minimum mean square error (MMSE) frequency-domain equalization achieving frequency diversity effect whil...

The Orthogonal Frequency Division Multiplexing (OFDM) has widely been used in broadband wireless communication due to its ability to efficiently utilize the spectrum with multicarrier communication. In this paper BER expression for π/4 DQPSK modulation has been derived from FrFT based OFDM system in the presence of carrier frequency offset (CFO) under frequency selective Rayleigh fading channel...

This paper presents interference suppression using a subband adaptive array (SBAA) for uplink space-time block coding (STBC) code division multiple access (CDMA) under a frequency selective fading (FSF) channel. The proposed scheme utilizes CDMA with STBC and a receive array antenna with SBAA processing at the receiver. The received signal is converted into the frequency domain before despreadi...

This paper addresses the design and performance evaluation with respect to capacity of M-PSK turbo-coded systems operating in frequency-flat time-selective Rayleigh fading. The receiver jointly performs channel estimation and turbo decoding, allowing the two processes to benefit from each other. To this end, we introduce a suitable Markov model with a finite number of states, designed to approx...

This paper presents a novel receiver design from signal processing viewpoint for direct-sequence code-division multiple access (DS-CDMA) systems under multipath fading channels. A robust adaptive decision-feedback equalizer (DFE) is developed by using optimal filtering technique via minimizing the mean-square error (MSE). The multipath fading channels are modeled as tapped-delay-line filters, a...

Multi-carrier code division multiplexing (MC-CDM) is one of promising multiplexing techniques for fourth-generation mobile downlink communications systems, where high data rate services should be provided even for high speed-cruising mobiles. For MC-CDM-based packet communication, a frequency scheduling method, which adaptively assigns different sub-carriers to different users, is proposed. Thi...