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We consider the problem of wireless multicasting through multiple-input multiple-output (MIMO) heterogeneous networks in which macro and pico base stations communicate with multiple macro and pico users, respectively. At first, we calculate the multicast capacity of macro users (MUs) and pico users (PUs), and investigate the impact of interferences on it. Then, we use zero-forcing (ZF) precoding at...
In this study, we analyze the role of interleavers in OFDMA system for ensuring uniform BER performance amongst the active users and also investigate their respective PAPR properties. At first considering a generic system in a slowly changing multipath channel where high dispersion in the individual users performance exists, we apply different types of interleaving and show that they in general help...
In OFDMA, the subcarrier allocation process amongst the users has a significant role in governing the performance of the system. In this paper, we study the application of interleaver based subcarrier allocation schemes for ensuring uniform BER across all the active users. We show that for a slowly changing multipath channel, individual user's BER performance can vary from each other to a great extent,...
This paper introduces a new multicarrier system that uses a low computational complexity transform developed by Boussakta to combine the Walsh-Hadamard Transform (WHT) and Discrete Fourier Transform (DFT) into a single orthogonal transform or as a transition from one transform domain to another. The proposed transform is used in a new orthogonal frequency division multiplexing (T-OFDM) system, across...
The underwater acoustic communication (UAC) channel presents severe time, space, and frequency selectivity that makes it difficult to achieve high data rate communication. In the recent years OFDM is used to resolve primarily frequency selectivity among these problems. Due to high absorbency of water over small frequency range path loss may be highly variable over OFDM subcarriers. This paper will...
Iterative decoding of an irregular variable-length coding (IrVLC) scheme concatenated with precoded fast frequency-hopping (FFH) M-ary frequency-shift keying (MFSK) is considered. We employ extrinsic information transfer (EXIT) charts to investigate the three-stage concatenation of the FFH-MFSK demodulator, the rate-1 decoder, and the outer IrVLC decoder. The proposed joint source and channel coding...
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