Abstract
The handling of intercell interference at the cell border area is a strong demand in future communication systems to guarantee efficient use of the available bandwidth. Therefore, this paper focuses on the application of iterative intercell interference cancellation schemes in cellular multicarrier code division multiple access (MC-CDMA) systems at the receiver side for the downlink. First, the influence of the interfering base stations to the total intercell interference is investigated. Then, different concepts for intercell interference cancellation are described and investigated for scenarios with several interfering cells. The first approach is based on the use of the hard decision of the demodulator to reconstruct the received signals. This does not require the higher amount of complexity compared to the second approach which is based on the use of the more reliable soft values from the decoding process. Furthermore, the extrinsic information as a reliability measure of this soft iterative cancellation process is investigated in more detail based on the geographical position of the mobile terminal. Both approaches show significant performance gains in the severe cell border area. With the soft intercell interference cancellation scheme, it is possible to reach the single-user bound. Therefore, the intercell interference can be almost eliminated.
Highlights
The high data rate demands of generation mobile communication systems require a very efficient exploitation of the available spectrum
The number of used subcarriers is Nc = 768 and the guard interval length is set to NGI = 226
In the inner part of the desired cell a small influence of the number of interfering cells is visible because the mobile terminal (MT) is nearly equidistant to all surrounding base station (BS). These results show that the main contribution of the intercell interference in a cellular multicarrier code division multiple access (MC-code division multiple access (CDMA)) system is generated by the two closest interfering BSs
Summary
The high data rate demands of generation mobile communication systems require a very efficient exploitation of the available spectrum. A Gaussian approximation was proposed for the intercell interference modeling which was verified with more analytical investigations in [10, 11] This simplified intercell interference assumption allows a large reduction of the simulation complexity for cellular MC-CDMA systems. Note that the packet-switched channelaware scheduled transmissions which will take place in future systems complicate the use of many of the previously suggested schemes for intercell interference avoidance. It is not, without additional side information, possible to conclude that the interference power in a set of subcarriers is likely to be higher/lower than average just because it is measured as high/low at present. The performances of the different ICIC schemes are compared by simulations
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