In the present work we have analysed the performance of a dual hop cooperative communication system. Multiple relays are taken for DF (Decode and Forward) relaying of signal from source to the destination over i.i.d. ...
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ISBN:
(纸本)9781467396233
In the present work we have analysed the performance of a dual hop cooperative communication system. Multiple relays are taken for DF (Decode and Forward) relaying of signal from source to the destination over i.i.d. α - μ generalized fading channel distribution. Multiple antennas are realized at all the receive and transmit nodes on the source, relay and destination with Orthogonal space time block coding (OSTBC) implementation. Theoretical approximation for Symbol Error Rate (SER) performance is evaluated for Binary Phase Shift Keying (BPSK) and 4-Quadrature Amplitude Modulation (4-QAM) schemes as a function of Signal to Noise Ratio (SNR) using the Moment Generating Function (MGF) of the channel distribution. The variation of performance with number of relays used is studied. Monte Carlo simulation is used for verification of the analytical expression obtained.
Cognitive radio (CR) systems require knowledge of the signal environment if they are to coexist with the primary (incumbent) users of the radio spectrum. Consequently, signal identification is a major task of a CR. Th...
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ISBN:
(纸本)9781457720529
Cognitive radio (CR) systems require knowledge of the signal environment if they are to coexist with the primary (incumbent) users of the radio spectrum. Consequently, signal identification is a major task of a CR. This paper proposes a novel identification algorithm for spatial multiplexing (SM) and Alamouti space-timeblock code (AL STBC) transmissions, when the CR employs a single receive antenna. This algorithm relies on the fourth-order moment as a discriminating signal feature and uses a maximum likelihood (ML) criterion for decision making. Its performance is investigated through theoretical analysis and simulation experiments.
Signal classification is a major task of a cognitive radio. This paper proposes a novel cyclostationarity-based algorithm for the blind classification of spacetimeblock codes (STBCs) and derives analytical expressio...
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ISBN:
(纸本)9781457720529
Signal classification is a major task of a cognitive radio. This paper proposes a novel cyclostationarity-based algorithm for the blind classification of spacetimeblock codes (STBCs) and derives analytical expressions for the second-order cyclic statistics used as the basis of the algorithm. Monte Carlo simulation results demonstrate a good classification performance with low sensitivity to phase noise and the channel Doppler shift. The proposed approach avoids the need for a priori knowledge of the channel coefficients, carrier phase, and timing offsets. Moreover, it does not need accurate information about the transmission data rate and carrier frequency offset.
In this paper, we propose a compensation method for the joint effect of high-power amplifier (HPA) nonlinearity, in-phase/quadrature-phase (I/Q) imbalance and crosstalk in multiple-input multiple-output (MIMO) orthogo...
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ISBN:
(纸本)9781457713460
In this paper, we propose a compensation method for the joint effect of high-power amplifier (HPA) nonlinearity, in-phase/quadrature-phase (I/Q) imbalance and crosstalk in multiple-input multiple-output (MIMO) orthogonal space-timeblockcoding (OSTBC) systems. The performance of the MIMO OSTBC equipped with the proposed compensation mechanism is evaluated in terms of average symbol error probability and system capacity, in Rayleigh fading channels. Numerical results are provided and show the effects on performance of several system parameters, namely, the HPA parameters, image-leakage ratio, crosstalk, numbers of antennas, and phase-shift keying modulation order.
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