Asynchronous Multiple Access Performances of Frequency-Time-Hopped Multi-Level Frequency-Time Shift Keying Communication Systems (Special Issue on Spread Spectrum Techniques and Applications)

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Assuming application to the mobile multiple-access communication, chip-asynchronous mobile-to-base perfor mances of FH / FTH (Frequency-Time-Hopped)-MFTSK (Multi-level Frequency-Time Shift Keying) systems are inverstigated. Analytical expressions are obtained for the probabilities of false detection and missed detection of signal elements, assuming independent and asynchronous arrival of each of the signal elements with Rayleigh fading and optional AWG noise. Using the result or by simulation and employing dual-k coding, parameter optimization was carried out to obtain the maximum spectrum efficiency. The results of the noisy case analysis and simulation show high noise-robustness of the FTH systems. For a given value of information transmission rate the optimized FTH-MFTSK gives an effectively constant spectrum efficiency for a wide range of the number K_f of frequency chips. As a result, FTH-MFTSK well outperforms FTH-MFSK at any, especially small value of K_f. Relative to the overall optimum FH-MFSK, FTH-MFSK systems show typically around 20% of degradation in spectrum efficiency even with one-eighth of K_f. Compared with FH-MFSK, accordingly, FTH-MFTSK systems allow the designer to reduce, without any degradation in multiple-access performances, the number of frequency chips to the minimum value tolerated by the frequency selective fading characteristics and the time chip duration requirement imposed by the signal-to-noise ratio margin and the transmitter peak power rating.
社団法人電子情報通信学会の論文
1993-08-25

Asynchronous Multiple Access Performances of Frequency-Time-Hopped Multi-Level Frequency-Time Shift Keying Communication Systems (Special Issue on Spread Spectrum Techniques and Applications)

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