By M. Khatib
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Extra resources for Advanced Trends in Wireless Communications
The preamble detection is based on the cross-correlation of 64 successive received bits and the internal 64 bits preamble. Further, each Ck (1 ≤ k ≤ 8) correlator of 64 bits must analyze a 1-bit shifted sequence. Therefore, the preamble detection is performed with 64+7 = 71 bits, due to the different possible shifts of a byte. In all, there are 8 correlators in each bank of correlators. In addition, in order to improve the frame synchronization performance, two banks of correlators are used, taking into consideration the periodical repetition of the preamble: P1 (8 bytes) + D1 (510 bytes) + P2 (8 bytes) + D2 (510 bytes) + P3 (8 bytes).
Fig. 18 presents the result of an impulse response of the RF Tx-Rx blocks at 10 m Tx-Rx distance. A back-to-back test was realized using a 45 dB fixed attenuator at 60 GHz but similar results were obtained. Therefore, few side lobes were obtained which are mainly due to RF components imperfections. 5 Frequency (GHz) Fig. 17. Frequency response of RF blocks (Tx & Rx) using horn antennas 10 m Tx-Rx distance -4 8 x 10 Impulse response (uU) 7 6 5 4 3 2 1 0 33 34 35 36 37 38 39 40 41 42 43 Time (ns) Fig.
S. (1947). Probability functions for the modulus and angle of the normal complex variate, Bell System Technical Journal 26: 318–359. James, H. B. & Wells, P. I. (1955). Some tropospheric scatter propagation measurements near the radio-horizon, Proceedings of the IRE pp. 1336–1340. , Muhammad, S. & Leitgeb, E. (2006). Estimation of the power scintillation probability density function in free-space optical links by use of multicanonical monte carlo sampling, Optics Letters 31(21): 3077–3079. , Kotsopoulos, S.