Agilent Technologies 8922M, S GSM manual Crc

Glossary

Burst-by-Burst

Bit Error Rate The Burst-by-Burst Bit Error Measurement makes use of a new loopback path within the mobile to calculate the equivalent Class II BER. This measurement is 5 times faster than the conventional method. This is also sometimes known as Fast Bit Error Measurement.

Channel Coding The baseband digital process used to arrange the error protected speech data into the final form necessary for RF transmission. Channel coding involves adding the following data for channel control: training sequences, tail bits, and guard bits.

Class I Bits	In an error correction scheme, the most important data bits. This
	class is subdivided into classes Ia and Ib.
Class II Bits	In an error correction scheme, the slowly changing or long-term
	data bits. Class II bits receive no error correction.
CRC	Cyclic Redundancy Check. A method for detecting errors by
	dividing the reception polynomial (which expresses the
	reception data) by the generator polynomial, and then detecting
	errors by residuals.
DCS1800	Digital Cellular System. DCS1800 is technically very similar to
	GSM900 with wider frequency bands leading to more channels
	and at a frequency of 1.8 GHz. DCS1800 systems are designed
	to cope with higher user densities. DCS1800 mobiles have a
	lower output power than GSM900 mobiles, therefore the cell
	size is smaller.
Equalization	The process used by digital radios to correct for the fading
	which occurs in real world conditions.
Error
Correction	A way to provide reasonable voice quality for digital radios that
	are subject to Doppler shifts and multipath fading. Types of
	error correction include parity bits, cyclic error correction
	coding, and convolutional coding.
FACCH	When the SACCH reports coming back to the BS indicate that
	another cell would offer the mobile a better signal quality, a
	handover is necessary. The SACCH doesn’t have the bandwidth
	necessary to transfer all the information associated with the
	handover. The TCH is replaced by a FACCH (Fast Associated
	Control Channel), for a short time using short consecutive
	bursts, which have a higher data rate than the SACCH, which

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