Papers by Borhanuddin Mohd Ali
Wireless Personal Communications, 2013
Agile-SD is one of the latest versions of loss-based congestion control algorithm (CCA), which ha... more Agile-SD is one of the latest versions of loss-based congestion control algorithm (CCA), which has been proposed to improve the total performance of transmission control protocol (TCP) over high-speed and short-distance networks. It has introduced a new mechanism, called agility factor mechanism, which shortens the epoch time to reduce the sensitivity to packet losses and in turn to increase the average throughput. Agile-SD has only been tested via simulation; however, it has not been mathematically proven or evaluated. The contribution of this paper is twofold. First, a new mathematical model for the throughput of NewReno and Agile-SD is proposed. This model is designed using the well-known Markov chains to validate the correctness of Agile-SD and to show the impact of buffer size, multiplicative decrease factor, and maximum limit of agility factor (λ max) on the total performance. Second, an automated algorithm configuration and parameter tuning (AACPT) technique is employed to optimize and automate the configuration of λ max. Furthermore, the numerical results for both NewReno and Agile-SD are compared with the simulation results, in which the validity of the proposed model is confirmed. Moreover, the output of the AACPT is exploited to formulate a new equation, which calculates the optimal λ max from a given β in order to conserve the standard interface of the TCP. This equation increases the scalability of Agile-SD and improves its total performance.
Proceedings of the Asia-Pacific Advanced Network, 2013
The 17th Asia Pacific Conference on Communications, 2011
Theoretically, IEEE 802.15.4 is more suitable for resource-constraint ad-hoc network because of i... more Theoretically, IEEE 802.15.4 is more suitable for resource-constraint ad-hoc network because of its low power consumption characteristic. However, performance of IEEE 802.11 is unknown if its transmission power and receiver sensitivity are limited to match those levels of IEEE 802.15.4. In this paper, the performance evaluation of IEEE 802.11 against IEEE 802.15.4 with those power levels is presented. The transmission
articles by Borhanuddin Mohd Ali
This paper presents a novel low-complexity technique for reducing the Peak-to-Average Power Ratio... more This paper presents a novel low-complexity technique for reducing the Peak-to-Average Power Ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) systems followed by an efficient hardware co-simulation implementation of this technique by using a Xilinx system generator on a Field Programmable Gate Array (FPGA). In this technique, each subblock is interleaved with the others, and a new optimisation scheme is introduced in which the number of iterations is equal only to the number of subblocks, which results in reduced processing time and less computation that, in turn, leads to reduced complexity. Furthermore, the proposed method focuses on simplifying the required hardware resources. Thus, it can be easily combined with other simplified techniques. The simulation results demonstrate that the new technique can effectively reduce the complexity up to 98.22% compared with the new existing Partial Transmit Sequence (PTS) techniques and yield a good Bit Error Rate (BER) performance. Through the comparison of performance between simulation and hardware, it is distinctly illustrated that the designed hardware block diagram is as workable as the simulation and the difference of the result is only 0.1 dB.
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Papers by Borhanuddin Mohd Ali
articles by Borhanuddin Mohd Ali