08_03_074_080.pdf - 74 F GLEISSNER S HANUS CO-CHANNEL AND...

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74 F. GLEISSNER, S. HANUS, CO-CHANNEL AND ADJACENT CHANNEL INTERFERENCE MEASUREMENT... Co-channel and Adjacent Channel Interference Measurement of UMTS and GSM/EDGE Systems in 900 MHz Radio Band Filip GLEISSNER, Stanislav HANUS Dept. of Radio Electronics, Brno University of Technology, Purky ň ova 118, 612 00 Brno, Czech Republic [email protected], [email protected] Abstract. This paper is concerned with inter-system and intra-system interference measurements of 2.5G and 3G mobile communication systems. The both systems UMTS and GSM/EDGE are assumed to operate in a common radio band of 900 MHz. The main system parameters are briefly introduced as well as the measurement scenario. Several simulations and key measurements were per- formed. Important results are described and commented along with a graphical representation, namely bit error ratio (BER) dependence on carrier to noise ratio (CNR) in the presence of additive white Gaussian noise (AWGN), the measurement of adjacent channel interference ratio of each system, the coexistence of both systems in same band and the impact of a carrier offset on BER. Keywords UMTS, GSM/EDGE, interference, measurement, co- channel, adjacent channel, BER, carrier offset. 1. Introduction The radio spectrum becomes occupied very densely nowadays. Thus, radio planning and management is a vital question of present studies and papers. The performance of any radio system is interference dependent. The aim of this work is the coexistence investi- gation of the mobile wireless systems UMTS and GSM/EDGE. The main aspect observed is co-channel and adjacent channel interference, while both the systems oper- ate in the common radio band of 900 MHz. Frequency planning is assumed, in which a UMTS carrier is sandwiched between existing GSM carriers with sufficient guard bands between the carriers (see Fig. 1). The size of guard bands is the subject of examination, because there could be possible capacity loss due to the adjacent channel interference. Standard rules for the guard bands are based on nominal assumptions about the adjacent channel selectivity (ACS) of the receivers and the adjacent channel leakage (ACLR) of the transmitters. It has been shown that inter- ference from GSM uplink onto the UMTS uplink is the dominant cause of capacity loss. The use of adaptive filters on UMTS Node B transceivers, with the ability to selec- tively reject interfering GSM uplink signals, can essentially reduce the size of guard bands [4]. Fig. 1. Frequency plan – “sandwich” type of UMTS band between GSM bands. 2. Measurement Scenario It is very important to distinguish a measurement in a laboratory and a real-time measurement on an operating base station. There are clearly defined conditions in a labo- ratory in terms of fixed parameters. Moreover, the radio channel is simulated in a deterministic way. This method is suitable for cases that need reproducible testing, while the measurement in the real network reveals the real system behavior and operation. However, this method needs portable equipment and a direct access to the network [1].
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