Adit Kurniawan

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Multimedia Broadcast Multicast Services (MBMS) provides a mechanism to support effective delivery of multimedia traffic over cellular network for all users which request the same multimedia data. It was introduced in 3GPP release 6 and has been developed in recent release in term of enhanced MBMS (eMBMS). Current eMBMS can support two kinds of transmission,(More)
Channel estimation is one of key problems in IEEE 802.16e Orthogonal Frequency Division Multiplexing Access (OFDMA) downlink system. Minimum Mean Square Error (MMSE) channel estimation has been known as a superior performance channel estimation. However, this algorithm has high computational complexity. In this paper, we present low complexity(More)
Cerebral aneurysm is a cerebrovascular disorder in which weakening in the walls of brain blood vessels causing a swelling or dilation of blood vessels. The disease is also called intracranial aneurysms and usually occurs around the arteries at the base of the brain called the Circle of Willis.
The performance of the Least Mean Square (LMS) and Recursive Least Square (RLS) adaptive array are compared via Monte Carlo simulation. The comparisons are in terms of the convergence behavior, the Mean Square Error (MSE) of weight tracking, and the Bit Error Rate (BER). The communication systems is the downlink from High Altitude Platforms (HAPs) to(More)
This paper describes a successive multiuser detection technique for Direct Sequence Code Division Multiple Access (DS-CDMA) systems. In conventional CDMA system, single-user detection is employed, so that the interference between users or multiple access interference (MAI) component is considered as noise, which contributes to the statistics of detection(More)
⎯ This paper describes the performance evaluation of fixed step closed loop power control algorithm in a novel wireless channel that is called High Altitude Platforms (HAPs). This new wireless delivery method is proposed as a complementary system in providing the next generation services in which the technology basically employs CDMA. In HAPs communication,(More)
Wireless broadband access system will operate in high mobility and high data rate environment It is necessary to consider a system that is applied with or without perfect channel information, having more spectrum efficiency, and mitigating selective fading problems. We propose an MC CDMA multilevel coding system model that capable to solve those problems.(More)
In this paper an improved prediction-based power control is proposed for code division multiple access (CDMA) systems in Rayleigh fading channel environments. One of the most serious problems which degrades the performance of power control algorithm is the effect of feedback delay. To overcome the effect of feedback delay, power control needs to employ(More)
An improved method for estimating the symbol timing offset based on symmetric correlator using statistical change of correlator in preamble-aided OFDM systems is presented. It uses a preamble structure that have symmetrical property and combines with statistical change of Correlator to achieve a near-ideal timing performance without degradation in multipath(More)