SAIC-Single Antenna Interference Cancellation Technique in GSM

This page describes SAIC i.e. Single Antenna Interference Cancellation Technique used in GSM DARP enabled phone. It explains generic modules in SAIC receiver and covers types of SAIC algorithms.

In GSM, SAIC referred as Single Antenna Interference Cancellation technique. It was introduced in 3GPP Release 6. As the name suggests in SAIC technique a single antenna is used with interference cancellation/suppression.

It basically helps improve receiver performance of GSM enabled DARP-I compliant mobile/UE.

SAIC advantages

•  Due to performance improvement in receiver part of mobile/UE GSM BTS need to transmit less power compare to non-SAIC phones.
•  SAIC mobile will have less FER compare to non SAIC mobile phones
• Single antenna hence easy to integrate with mobile phone PCB and less size of the phone

There are two main SAIC algorithms viz. 1. Blind Interference Cancellation(BIC) 2. Joint Demodulation(JD)

BIC technique deals with desired signal and it is blind to the interferer signal. It is applicable to GMSK modulated signal used in GSM system. GMSK is mainly used for voice/GPRS applications. JD technique is used for 8-PSK modulation.

The technique used in MIMO is referred as MAIC(Multi Antenna Interference Cancellation). DARP-II enabled mobile phone usually use MSRD(Mobile Station Receiver Diversity) technique.

As shown in SAIC receiver block diagram, after timing estimation and correction, interference is estimated using auto regressive filter and later with I/Q whitening colored noise in the signal is converted to white noise before being applied to the channel estimation/equalization module.

To know more on colored noise versus white noise refer our page on
white noise versus colored noise.

GSM RELATED LINKS

RF and Wireless Terminologies