Yeni Bir QPSK Modülatör Mimarisinin Tasarımı

Bu çalışmada kablosuz haberleşme sistemlerinde yaygın olarak kullanılan QPSK (Quadrate Phase Shift Keying: Dördün Faz Kaydırmalı Anahtarlama) modülasyon tekniği için yeni bir mimari önerilmiştir. QPSK modülasyon tekniği, OFDM (Orthogonal Frequency Division Multiplexing: Dikgen Frekans Bölmeli Çoğullama) ve CDMA (Code Division Multiplexing Access: Kod Bölmeli Çoklu Erişim) gibi çoklu kullanıcılara hizmet veren sistemlerde yaygın olarak kullanılmaktadır. Dolayısıyla vericilerin kaynak kullanımının düşük olması oldukça önemlidir. Yeni mimari sayesinde QPSK tekniğinin RAM bit kullanım miktarı %87.5 oranında düşürülmüştür. Ancak sistemin karmaşıklığı arttığı için TLE (Total Logic Element: Toplam Lojik Eleman) ve kaydedici kullanımı da artmıştır. Ayrıca önerilen yöntemin pratik uygulaması da düşük maliyetli Altera DE-0 Nano bord ile gerçekleştirilmiştir.

Design of a Novel Architecture for QPSK Modulator

In this study, a new architecture is proposed for QPSK (Quadrate Phase Shift Keying) modulation technique which is widely used in wireless communication systems. QPSK modulation technique is generally utilized in systems serve multiple user such as OFDM (Orthogonal Frequency Division Multiplexing) and CDMA (Code Division Multiplexing Access). Therefore, it is very important that transmitters have low resource utilization. Thanks to the new architecture, RAM bit utilization of QPSK technique is decreased by up to 87.5%. However, the use of TLE (Total Logic Element) and register rise since complexity of the system increases. Besides, practical application of the proposed technique is realized by using low-cost Altera DE-0 Nano Board.

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