Multiuser Detection for LTE Random Access in MTC-Oriented Space Information Networks

The random access (RA) procedure in LTE systems is essential for the machine-type communication (MTC) in space information networks (SIN). By using the RA procedure, the delays of different MTC terminals could be aligned to the reference timing such that signals of each other could arrive at the satellite simultaneously. To this end, an enhanced iterative parallel interference cancellation (EIPIC) algorithm is proposed in this paper. Analyses show that the inverse impact of multiple access interference and near-far effect always persists even though the codes are ideally orthogonal with each other. The proposed algorithm could parallelly detect each possible code, re-construct its frequency-domain signal and cancel its inverse impact for further detection. And an optimized weighting vector is further applied for the frequency-domain signal re-construction based on the analyses of the mean square error. Simulation results show that the proposed algorithm could significantly improve the RA performance compared to existing algorithms.

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