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In this contribution, we examine the bit error rate (BER) performance of orthogonal space-time block codes (OSTBCs) under flat-fading channels with imperfect channel state information. We present new exact BER expressions for PAM and QAM signal constellations, regardless of the fading distribution. Furthermore, we show how these expressions can be efficiently and accurately evaluated for the case...
In the paper, performance of multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) eigenbeam-space division multiplexing (E-SDM) systems using uniform circular antenna arrays is evaluated. We conducted a MIMO channel measurement campaign at a 5.2 GHz frequency band in an indoor fading environment. Simulation results based on the measured data have shown that differently...
Abstract-One-tap frequency-domain equalization (FDE) can significantly improve the bit error rate (BER) performance of single-carrier (SC) transmission in a frequency-selective fading channel. However, a big performance gap from the theoretical lower bound still exists due to the presence of residual intersymbol interference (ISI) after FDE. In this paper, we point out that the frequency-domain received...
A performance-enhanced two-transmit antenna spatial modulation (SM) technique is introduced and analysed. Specifically, this paper modifies the conventional spatial modulation technique by utilising simultaneous transmission from both antennas to improve the diversity aspect and hence the system performance. A unique symbol to antenna assignment to enable the receiver to distinguish between the different...
We propose an implementation of the tapped delay line adaptive array (TDLAA) at the base station for improving the BER performance of asynchronous multi-user in mobile communication over fast fading channels using multiple antennas. The data in each user at the mobile station, which applies two transmit antennas, are encoded by space time block code (STBC). The proposed scheme transmits the pilot...
An analytical approach is presented to determine the impact of time selective fading, timing jitter and AWGN on a STBC-OFDM system with DQPSK, DPSK and QPSK modulation schemes. The BER performance results are evaluated for different values of fading and jitter variance in presence of single and multiple receiving antennas. The computed results show that the DPSK and QPSK systems suffer higher amount...
Free space optical (FSO) communications is a cost-effective and high bandwidth access technique, which has been receiving growing attention with recent commercialization successes. A major impairment in FSO links is the turbulence- induced fading which severely degrades the link performance. To mitigate turbulence-induced fading and, therefore, to improve the error rate performance, spatial diversity...
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