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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)
This paper examines the performances of spatial multiplexing (SM) and maximal ratio combining (MRC) systems in the presence of the polarization diversity. It is assumed that dual-polarized antennas are used at both the transmitter and the receiver. The symbol error rate (SER) for SM and MRC systems is obtained as a function of cross polarization(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)
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)