Single Antenna Interference Cancellation
- Single Antenna Interference Cancellation
Single Antenna Interference Cancellation or known as SAIC is a promising technology to boost the capacity of GSM network without any needed change in the network. It is in the high interest of the network operator to use the allocated spectrum as efficiently as possible and to the highest possible capacity because most of the investment is done to get the licence for it. It would be desirable to have the frequency reuse of one, which means that each cell can operate in the same frequency. This in turn creates interference to the users operating in nearby places. Increase Interference causes voice quality to drop and may cause call drop. It is now a well known fact that it is possible to cancel the interference at the mobile handset side by changing the baseband software without changing anything in the network side. SAIC-enabled mobiles can work in high interference levels. SAIC-enabled mobiles need even less transmit power from the network which in turn reduces the interference for non-SAIC mobiles. studies shows that with 100% SAIC mobile penetration a capacity gain of 60 to 80% is achievable. There are various approaches possible to have a SAIC-enabled phone:
1. Prefilter based baseband algorithms (2X complex than conventional receiver but gives 12-15 dB gain)
2. Constant Modulus based SAIC (simple but less gain and also it is not very robust)
3. Joint Detection (JD):a. Best case (Training sequence and timing of Interferer is known):i. very high gain compared to all available algorithms:ii. not a practical method as without signalling message support from the network it is not possible to know the training sequence of the interferer:b. Worst case (Training sequence and timing of interferer is not known):i. Very high complexity:ii. good gains in terms of dB:iii. not a practical method of implementation because of complexity
References
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