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This paper presents the strategy of combining antenna selection with an adaptive modulation scheme for Multiple Input Multiple Output (MIMO) systems. The proposed scheme maximized the Average Spectral Efficiency (ASE) with a constant power for a given Bit Error Rate (BER) constraint. This system provided the advantages of both antenna selection and adaptive modulation technique Also due to the practical...
This study presents an exact analysis of circuit non-linearity and phase noise effects on orthogonal frequency division multiplexing (OFDM) communication systems. Using an analytical approach, the degradation effects of these impairments on the performance of OFDM systems are studied. A truncated power series is used to represent the third-order non-linear behaviour of a radio frequency circuit. The...
The effect of DC offset on multi-input multi-output (MIMO) direct transceivers with adaptive modulation (AM) is discussed in this paper. A variable-rate variable-power (VRVP) AM system with perfect channel state information (P-CSI) at both the transmitter and receiver in a MIMO scenario is considered. The DC offset is modeled as a zero mean complex Gaussian distributed random variable. By this modeling...
In this paper, continuous phase modulation (CPM) is detected using TURBO-BLAST space-time architecture to improve the system performance. This is realized by implementing an iterative architecture according to the trellis structure of CPM modulation in space-time communication systems. This architecture provides the benefits of the space-time wireless communication systems while it preserves the advantages...
A direct conversion modulator-demodulator with even harmonic mixers for fixed wireless applications is presented. The circuits consist of even harmonic mixers (EHMs) realized with antiparallel diode pairs (APDPs). The self-biased APDPs are used to flatten the conversion loss of the mixers. We also evaluate the different levels of I/Q imbalances and DC-offsets and use signal space concepts to analyze...
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