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SUMMARYThe advantages of subband signal processing adaptive array (SBAA) are the ability to perform parallel signal processing in each subband division and the substantial reduction in the total computational load. However, the price is not preventing a drop in performance, for example, the incorporation of delayed waves, and a countermeasure must be found. Therefore, in this paper, we propose introducing a scheme that inserts a guard interval (cyclic prefix), which is commonly adopted in Orthogonal Frequency Division Multiplexing (OFDM), into ordinary data transmission, and extracts the best possible performance of SBAA. We also evaluate the performance by a computer simulation.

A novel transmitter, which does not require the up-converter at the baseband stage, is presented. The main difference between proposed system and conventional one is the use of an alias harmonic component as high-IF (Intermediate Frequency) signal.In this paper, each alias harmonic components are examined by EVM (Error Vector Magnitude) and, the RF (Radio Frequency) front-end using the 3rd order alias harmonic component at 180 MHz as IF is demonstrated. The EVM performance of RF output at 2150 MHz resulted in less than 4 % in the case of 200 ksps (symbol per second).

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