Method of determining sampling time points

Details Method of determining sampling time points Method of determining sampling time points

1992-11-17

1993-07-13

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375111, 375114, H04L 2710

Patent

active

052280578

ABSTRACT:
Symbol sequences having synchronization sequences are transmitted over a radio channel. Received signals are sampled in signal sampling time points (n) and by correlation a channel response (C.sup.2) is obtained. The impulse response is sampled (T.sub.s) over a period (M.times.N) corresponding to time dispersion of the channel. For separate samples with separate start points (n), channel estimates are obtained (n=0, 2, 4, 6, N=1, 3, 5, 7. . .) whose energy values are calculated, and the estimate (n=8, 10, 12, 14) with the largest energy is selected. The first time point (n=8) in this estimate is selected as sampling time point for the symbol sequence. Alternatively, the signal sampling time point (n=9) with maximum energy value (C.sup.2 max) is selected. By comparing the energy values either one of these signal sampling time points (n=8 , n=9) can be selected as the sampling time point for the symbol sequence. For consecutive sequences, an average value for the sampling time points is calculated.

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"Adaptive Adjustment of Receiver for Distorted Digital Signals", A. P. Clark and S. F. Hau, IEE Proceedings, vol. 131, Pt. F, No. 5, (Aug. 1984) pp. 526-536.
"Estimation of the Sampled Impulse-Response of a Channel"; A. P. Clark, C. P. Kwong, and F. McVerry, Signal Processing 2 (1980) pp. 39-53.

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