| 1. |
- Ben Slimane, Slimane, et al.
(författare)
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A doubly stochastic Poisson model for self-similar traffic
- 1995
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Ingår i: IEEE International Conference on Communications. ; , s. 456-460
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Konferensbidrag (refereegranskat)abstract
- This paper presents a data traffic model capable of describing the long-range dependence and self-similar burstiness structure found in measurement studies of packet data traffic. The model introduced is based on doubly stochastic Poisson processes. The intensity of arrivals is modeled as a continuous stochastic process. This process satisfies most of the properties found in the measurement studies, namely long-range dependence and self-similarity. The generality and simplicity of this model makes it attractive in data traffic modeling
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| 2. |
- Ben Slimane, Slimane, et al.
(författare)
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Coded quadrature pulse-overlapping modulation techniques for personal communications
- 1992
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Ingår i: 1st International Conference on Universal Personal Communications, 1992. ICUPC '92 Proceedings. ; , s. 11-03/1-11-03/5
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Konferensbidrag (refereegranskat)abstract
- Hard-limited quadrature pulse-overlapping modulation (QPOM) techniques have a constant envelope, good spectral properties and good performance especially in fading channels. These modulation techniques are suitable to applications using nonlinear or saturated power amplifiers to obtain high power and bandwidth efficiencies. A technique to combine convolutional codes and QPOM schemes to further improve its performance in fading channels is introduced and evaluated. At first, the QPOM scheme is decomposed into an encoder followed by a memoryless modulator. Then, the binary convolutional encoder is concatenated to the QPOM encoder and considered as one entity to be optimized. Performance of the coded QPOM scheme is analyzed and compared to uncoded QPOM and coded QPSK schemes
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| 3. |
- Ben Slimane, Slimane, et al.
(författare)
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IJF-OQPSK modulation schemes with MLSE receivers for portable/mobile communications
- 1992
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Konferensbidrag (refereegranskat)abstract
- A receiver structure for constant enveloped IJF-OQPSK modulation under fading channel conditions is introduced. Its performance in AWGN and Rayleigh fading channels was analyzed and verified by computer simulations. Results show the relation between the performance of the system and the memory introduced by the double-interval overlapping pulse shape. By properly using this memory, it is possible to achieve superior performance compared to conventional schemes. Even though no coding has been used, comparable results to coded schemes was obtained with no extra redundancy. Therefore, the complexity caused by multilevel modulation can be avoided, and transmission of signals with compact spectrum and good performance is possible. The constant envelope, compact spectrum, superior performance in fading channels and low complexity make the hardlimited IJF-OQPSK scheme a good choice for portable/mobile communications, to achieve low cost, small size, and high power and bandwidth efficiencies
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| 4. |
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| 5. |
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| 6. |
- Ben Slimane, Slimane, et al.
(författare)
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Performance of 16-QPOM signals on a fading mobile satellite channel
- 1993
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Ingår i: Proceedings of the IEEE 1993 Pacific Rim Conference on Communications, Computers and Signal Processing. ; , s. 674-677
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Konferensbidrag (refereegranskat)abstract
- The authors present a maximum likelihood sequence estimation (MLSE) receiver structure for both linear and hard-limited 16-quadrature pulse overlapping modulation (QPOM) schemes. Using this structure, the performance of these schemes over shadowed Rician fading channels is studied. The structure of linear 16-QPOM schemes allowed the use of independent decoding for in-phase and quadrature components of the transmitted signal, thus reducing considerably the complexity of the MLSE receiver. The hard-limited 16-QPOM scheme used two hard-limited QPOM schemes in parallel. It is shown that an optimum MLSE receiver for this type of signal needs to consider both in-phase and quadrature components at the same time. Using the MLSE receiver, both schemes outperform conventional coherent 16-quadrature amplitude modulation (QAM)
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| 7. |
- Ben Slimane, Slimane, et al.
(författare)
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Performance of 16-QPOM signals on a fading mobile satellite channel
- 1993
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Ingår i: Proceedings of the IEEE Global Telecommunications Conference. - : IEEE. ; , s. 1787-1791
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Konferensbidrag (refereegranskat)abstract
- Presents the bit error probability of 16-QPOM schemes over mobile satellite shadowed Rician fading channels. An upper bound on the pairwise error probability is derived, and then combined with the transfer function bounding technique. The derived upper bound is given in a closed form without the need of any numerical integration. This upper bound is then used to evaluate the performance of both linear and hard-limited 16-QPOM signals. Simulation results are also performed to verify the analytical results
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| 8. |
- Ben Slimane, Slimane, et al.
(författare)
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Performance of quadrature pulse-overlapping modulated signals in Rayleigh fading channels
- 1991
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Ingår i: IEEE Global Telecommunications Conference and Exhibition. ; , s. 1802-1806
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Konferensbidrag (refereegranskat)abstract
- The authors discuss the average bit error probability of constant envelope quadrature pulse-overlapping modulation and maximum likelihood Viterbi decoding in a Rayleigh fading channel. The quadrature pulse-overlapping modulation is first decomposed into a linear encoder followed by a memoryless modulator. An upper bound on the average bit error probability as a function of the transfer function of the linear encoder is then developed under the assumption of using the Viterbi decoder with perfect fading amplitude measurement. Tightness of the bound was examined by means of computer simulation. A performance comparison with conventional quadrature phase shift keying is also provided
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| 9. |
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| 10. |
- Ben Slimane, Slimane, et al.
(författare)
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Tight bounds on the error probability of coded modulation schemes in Rayleigh fading channels
- 1994
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Konferensbidrag (refereegranskat)abstract
- This paper presents a tight upper bound on the bit error performance of coded modulation schemes in Rayleigh fading channels. Upper and lower bounds on the pairwise error probability are first derived. The upper bound is then expressed in a product form to be used with the transfer function bounding technique. This upper bound has the same simplicity as the union-Chernoff bound while providing closer results to the exact expression. Examples for 4-state and 8-state TCM 8PSK schemes are also given to illustrate the tightness and the application of this upper bound
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| 11. |
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| 12. |
- Vu, Thanh Tung, et al.
(författare)
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Energy-Efficient Massive MIMO for Federated Learning : Transmission Designs and Resource Allocations
- 2022
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Ingår i: IEEE Open Journal of the Communications Society. - : Institute of Electrical and Electronics Engineers (IEEE). - 2644-125X. ; 3, s. 2329-2346
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Tidskriftsartikel (refereegranskat)abstract
- This work proposes novel synchronous, asynchronous, and session-based designs for energy-efficient massive multiple-input multiple-output networks to support federated learning (FL). The synchronous design relies on strict synchronization among users when executing each FL communication round, while the asynchronous design allows more flexibility for users to save energy by using lower computing frequencies. The session-based design splits the downlink and uplink phases in each FL communication round into separate sessions. In this design, we assign users such that one of the participating users in each session finishes its transmission and does not join the next session. As such, more power and degrees of freedom will be allocated to unfinished users, resulting in higher rates, lower transmission times, and hence, higher energy efficiency. In all three designs, we use zero-forcing processing for both uplink and downlink, and develop algorithms that optimize user assignment, time allocation, power, and computing frequencies to minimize the energy consumption at the base station and users, while guaranteeing a predefined maximum execution time of each FL communication round.
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