Trio Adiono

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High mobility communication systems need suitable channel estimation to cope high frequency selectivity channel effect. In this paper we propose data pilot based channel estimation in downlink OFDMA for IEEE 802.16e standard (mobile WiMAX). The mobile WiMAX channel estimation can be done by exploiting pilot from preamble, in this paper we obtain channel(More)
In Digital Signal Processing, trigonometry and complex multiplications are used in many signal equations, such as synchronization and equalization. Therefore, a fast and an efficient method to calculate trigonometry and complex multiplications are required. Coordinate Rotation Digital Computer (CORDIC) is trigonometric algorithm <sup>[1]</sup> that is used(More)
In this paper, we propose a hardware-software co-design solution for a real-time noise cancelling algorithm using spectral subtraction algorithm. The hardware and software are partitioned based on the logic size and the speed performance. Considering the speed, hanning windowing filter and 64-point I/FFT are implemented in a dedicated hardware modules. Due(More)
This paper proposes a formulation scheme for communication data protocol at the application layer that can adapt to heterogeneous smart objects which may arise in the case of Smart Home application. Mesh-based design WSN is an attempt to realize the Smart Home concept, where DigiMesh topology is chosen as the basic topology in experimental setup of WSN.(More)
This paper proposed a reconfigurable and flexible SoC architecture for various applications of wireless sensor network (WSN). The hardware-software system reconfiguration can be easy done because the systems utilize FPGA based SoC as a platform. The system also supports various network topologies and interfaces. The supported interface consists of I2C, SPI,(More)
Turbo code is a high performance channel coding which is able to closely reach the channel capacity of Shannon limit. It plays an important role to increase the performance in one of the latest standard in the mobile network technology tree, LTE [1]. In this paper, a new architecture of Turbo code encoder based on 3GPP standard is proposed. This(More)
This paper proposes timing synchronization for IEEE 802.16e OFDMA downlink. The proposed scheme utilizes the conjugate symmetry property of preamble structure. Therefore, prior knowledge of actual transmitted preamble type is not required. Considering hardware complexity, this paper proposes a new single correlation function for 114 different structures of(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)
This paper describes the design of a MIPS architecture with a small number of stall. Stall frequently happens in pipeline architecture which results in larger clock cycles. In this paper we significantly reduced stall by introducing pre-fetching unit. This unit reduces stall by concurrently reading three instructions and check their possibility of stall. If(More)
The use of hybrid automatic-repeat-request (HARQ) with multi-antenna systems (MIMO) promises high throughput with high reliability in broadband wireless communication systems. One of the combining methods in MIMO-HARQ is by directly optimizing the log-likelihood ratio (LLR) values instead of compensating the multiple signal-to-interference-and noise power(More)