PCF5083HSLASH001SLASHF2 datasheet(77/136 Pages) PHILIPS

77 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

EM_normal_burst

Adaptive viterbi equalizer for normal bursts. The 149 I and Q pairs in

IQ_BUFF are demodulated. The parameter cmi_buff_id determines the

buffer where the demodulated CMI values should be stored. The following

values for cmi_buff_id are allowed:

TCH_CMI_BUFFx for sub-block number x of a TCH.

CCH_CMI_BUFFx for sub-block number x of a CCH.

The parameter tsc determines the training sequence code. Valid range:

≤ tsc ≤ 7.

The 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 ≤ 28. A toi value of 12 is the optimal position.

For output_mode = 1; (see EM_init) 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:

For output_mode = 0; the frequency offset df in Hz is returned instead of

foi_im as the 4th return values.

It should be noted that the frequency offset output (for both output modes)

only contains meaningful information, if foi_re > 450.

cmi_buff_id

tsc

snr

toi

foi_re

foi_im df

EM_offset_measurement

This procedure measures the offset of the complex baseband signal

located in IQ_BUFF.

The parameter n_samples is the number of complex I and Q samples to be

used for averaging; n_samples must be one of the following values: 64 or

128. If n_samples is not specified, then a default value of 128 is used.

The i_offset and q_offset is the time averaged value of the complex

baseband signal.

[n_samples]

i_offset

q_offset

EM_power_measurement

Power measurement for RXLEV calculation of serving and neighbouring

cells.

The agc_gain is the gain of the current AGC range in 1

⁄8 dB.

The parameter n_samples is the number of I and Q samples located in

IQ_BUFF to be used for averaging; n_samples must be one of the following

values: 80 or 144. If the parameter n_samples is not speciﬁed, then a

default value of 80 is used.

The power_dBm is the time averaged value of the complex baseband

signal in 1

⁄8 dBm steps (range: −722+agc_gain to agc_gain).

agc_gain

[n_samples]

power_dB

DESCRIPTION

PARAMETERS

RETURN

VALUES

foi_im

foi_re

663

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