Orthogonal frequency division multiplexing with Index Modulation (OFDM-IM) has been used to transmit extra bits by indexing subcarriers using the ON-OFF keying modulation. In this paper, the closed-form of average bit error probability (ABEP) for BPSK and M-ary QAM modulations with OFDM-IM are derived in the absence and presence of co-channel interference (CCI) over composite Nakagami-m and Gamma (NG) shadowing channel. Simple closed-form expressions are introduced by using the Meijer G function. The theoretical results are validated through comparisons with existing research studies.

Abstract This paper presents a simplified mathematical approach to evaluate the performance of any given circular constellation of 16‐level quadrature amplitude modulation (16‐QAM) in terms of symbol error rate (SER). Following this approach, with the aim to work with memoryless nonlinear satellite channels, a model is derived as a generalized form for both linear and nonlinear channels in the presence of down link additive white Gaussian noise (AWGN). The analysis provides means to calculate the optimal ring ratio (RR) and phase difference (PD) for several possible candidates of 16‐QAM circular constellations. The effects of RR and PD on the SER performance are investigated in the analysis. To overcome the nonlinear distortion, data pre‐distortion is taken into account in the study. The paper gives a general procedure for data pre‐distortion implementation for all circular 16‐QAM constellations. The analytical formulation has been extended for total degradation (TD) performance measure as a function of input back‐off (IBO) of the nonlinear amplifier. A SER performance‐comparison between different constellations for 16‐QAM systems has also been presented in this paper. The analytical results are validated by simulation. Copyright © 2006 John Wiley & Sons, Ltd.

Central features of future 4G mobile communication systems are high-speed data transmission (up to 1 Gb/s) and interactive multimedia services. For effective delivery of these services, the network must satisfy some stringent QoS metrics, defined typically in terms of maximum delay and/or minimum throughput. Mobile satellite systems will be fully integrated with the terrestrial cellular systems to provide ubiquitous global coverage to diverse users. The challenges for future broadband satellite systems, therefore, lie in the proper deployment of state-of-the-art satellite technologies to ensure seamless integration of the satellite networks into the cellular systems and its QoS frameworks, while achieving, as far as possible, efficient use of satellite link resources. The paper presents an overview of future high-speed satellite mobile communication systems, the technologies deployed or planned for deployment, and the challenges. Focusing in particular on nonlinear downlink channel behavior, shadowing and multipath fading, various physical channel models for characterizing the mobile satellite systems are presented. The most prominent technologies used in the physical layer, such as coding and modulation schemes, multiple-access techniques, diversity combining, etc., are then discussed in the context of satellite systems. High-speed and QoS-specific technologies, such as onboard processing and switching, mobility and resource management, IP routing and cross-layer designs, employed in the satellite systems are also discussed.

This paper presents a theoretical analysis, for a noncoherent multi-tone code division multiple access (MT-CDMA) system with post-detection diversity combining, in terms of average bit error rate (BER) performance. The study considers slowly Rician fading and frequency selective channels in the indoor environment with differential quadrature phase shift keying (DQPSK) modulation. Here, the influence of the order of diversity and number of tones is studied for given bandwidth, bit rate and transmitter power. The paper also compares the BER performance of this system with its coherent counterpart.