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This paper presents an overview of the state-of-the-art technologies for future communication networks in order to satisfy complex and ever increasing user requirements. The new communication networks will be heterogeneous, embrace cognitivity and cross-layer protocol designs and permit interoperability between cellular systems, wireless local area(More)
This paper proposes opportunistic beamforming with multiple orthogonal beams and superposition coding on each beam for the downlink transmission in a single-cell environment. By exploiting limited feedback SINRs, the base station schedules simultaneous data transmission on multiple beams to the pairs of users with the largest SINRs. This paper presents the(More)
In this paper, the construction of GMSK modulated SDR (Software defined radio) design which could be processed in nano-satellites is discussed. A Gaussian FIR filter which is controllable and has the coefficients arranged with different BT values (0.3, 0.5, 0.7, and 1.0) has been formed. After the filter which works on the Cyclone II FPGA has been(More)
The bit error probability, delay and throughput of a hybrid-ARQ system based on LDPC is studied. The system performance is presented as a function of the packet length, maximum number of retransmissions, the number of iterations and decoding and combining strategies. Simulation results show that the proposed algorithm leads to improved system performance in(More)
This paper presents the bit error probability performance, in a Rayleigh fading channel, of a 3×3 multiple input multiple output (MIMO) system in which only one of the transmitter antennas is fed, whereas the others are used as parasitic elements. The transmit power, which feeds only one of the transmit antennas, is used more efficiently than the(More)
Rotated constellation techniques are usually employed for digital video broadcasting (DVB) to provide modulation diversity for M-PSK and M-QAM modulations over fading channels. Constellation rotation is usually coupled with interleaving the real and imaginary components of transmitted symbols either in time or frequency domain. If one of these components is(More)