A comparison of frequency-division systems to code-division systems in overloaded channels
作者： Joon Ho Cho , Qu Zhang , Lixin Gao
DOI: 10.1109/TCOMM.2008.050304
关键词:
摘要: In this paper, a frequency-division counterpart of joint power control and sequence design problem for code- division multiple-access (CDMA) systems is solved. Total transmit receive minimizations are considered frequency- multiplexing (FDM) multiple- access (FDMA) communications over overloaded channels. After the definition channel overloading CDMA extended to systems, user admissibility characterized by necessary sufficient condition existence optimal solution under unequal signal-to- interference-plus-noise ratio constraints at output linear receivers asymmetric data transmission rate among users. The signal power, bandwidth, waveform, waveform derived each as decision parameters optimization problem. It shown that, if applied uplink users minimize total FDMA system performs same system. also downlink FDM always outperforms code-division that minimizes squared correlation. Numerical results suggest achieve performance when minimized.
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