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PCF5083H/001/F2 数据表(PDF) 78 Page - NXP Semiconductors |
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PCF5083H/001/F2 数据表(HTML) 78 Page - NXP Semiconductors |
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78 / 136 page  1996 Oct 29 78 Philips Semiconductors Objective specification GSM signal processing IC PCF5083 EM_ sync_burst Adaptive viterbi equalizer for synchronization bursts. The 167 I and Q pairs in IQ_BUFF are demodulated. The demodulated CMI values are also stored in SCRATCH_BUFF. snr is an estimation for the signal-to-noise ratio (0 ≤ snr ≤ 255) The toi denotes the measured time difference (in quarterbits) between the first information bit of the burst and the start of the sampling window. Range: 0 ≤ toi ≤ 96. A toi value of 46 is the optimal position. The foi_re and foi_im denote the real and imaginary part of the frequency offset information. The frequency offset df (Hz) can be calculated in accordance with equation: 36 − snr toi foi_re foi_im FB_freq_estim This procedure performs a frequency measurement by analysing the phase of the 156 IQ samples located in IQ_BUFF. The parameter threshold is the frequency estimation reliability threshold. If it is not specified a default value of 3 will be used. fb_qual = 0; indicates that no FCB has been detected, fb_qual > 0 means that an FCB has been found. The fb_qual may be used as reliability information. The return value fb_foi is the measured frequency offset information in Hertz. fb_foi = received frequency − frequency of local oscillator. 66 [threshold] fb_qual fb_foi FB_freq_estim_init This routine initialises all internal counters that are used for averaging by FB_freq_estim and FB_estim_eval. It is not necessary to call FB_freq_estim if averaging via FB_freq_estim_eval is not required. 65 −− FB_freq_estim_eval The procedure performs a weighted averaging over all previous results of FB_freq_estim. The parameter threshold is the frequency estimation reliability threshold (recommended value: tbf). fb_flag = 0 indicates that no FCBs have been detected. fb_flag = 1 indicates that at least one FCB has been detected. The return value fb_foi is the measured frequency offset information in Hertz. fb_foi = received frequency − frequency of local oscillator. 67 threshold fb_flag fb_foi DESCRIPTION ID PARAMETERS RETURN VALUES f df foi_im foi_re 663 × ------------------------------- = |
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