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—In this paper, a stair-planar phased array antenna system for mobile broadcast satellite reception in Ku-band will be introduced. The height of the antenna is only 6 cm and the system has two-dimensional electronic scanning capability. The design procedures of low profile high gain microstrip sub-array antennas, low noise amplifiers, hybrid analog phase… (More)
In transmission of the packets using OFDM (Orthogonal Frequency Division Multiplexing) system recommended by IEEE.802.11  there is a constraint on the interleaving depth due to the maximum allowable packet size and processing delay requirement. This results in a non-ideal interleaving which effectively limits the maximum achievable diversity from the… (More)
—In this paper, deliberate level clipping and turbo coding are combined to achieve an orthogonal frequency division mul-tiplexing (OFDM) transmission system with a low peak-to-average power ratio (PAR) and a good performance. Using the linear approximation technique based on the minimum mean square error (MMSE) criterion, we first modify the metric… (More)
—In this paper, a novel hybrid tracking method for mobile active phased-array antenna systems is developed. The proposed technique consists of a mechanical stabilization loop and a direction-of-arrival (DOA) estimation algorithm, which is based on electronic beamforming. Compared with other tracking methods, the proposed method requires only one low-cost… (More)
Engineering, 578 pages. Combining theoretical knowledge and practical applications, this advanced-level textbook covers the most important aspects of contemporary digital communication systems.