Continuous phase frequency shift keying is a power/bandwidth efficient modulation technique, hence, attractive for use in relay/cooperative systems employing inexpensive nonlinear power amplifiers. We investigate optimum distributed space-time 4-ary continuous phase frequency shift keying trellis codes for amplify & forward relaying method and propose novel codes for relay transmission systems. The error performances of the classical and novel codes are investigated for one and two-relay systems using various transmission protocols.
ÖzetçeBu bildiride, uzay-zaman kafes kodları asimetrik 4PSK modülasyonu kullanılarak tasarlanmaktadır. Bu yolla, uzayzaman kafes kodlarına ilişkin determinant ve/veya iz değerlerinin artırılabildiği gösterilmektedir. Tasarlanan kodların duruğumsu sönümlemeli Rayleigh kanallardaki hata başarımları bilgisayar benzetimi yardımıyla incelenmekte ve önerilen yeni kodların literatürde var olan klasik uzay-zaman 4PSK kafes kodlarına göre hata başarımını iyileştirdiği gösterilmektedir.
AbstractIn this paper, space-time trellis codes are designed using asymmetric 4PSK modulations. By this way, it is shown that determinant and/or trace values of space-time trellis codes can be increased. The error performances of the new codes are investigated by computer simulations over quasi-static Rayleigh fading channels and it is shown that the proposed codes improve the performance with respect to the conventional space-time 4PSK trellis codes given in the literature.
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