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GSM network is seeing its greatest expansion because of the growing demand for mobile voice services in emerging markets recently. A newly proposed technology, Multi-User Reusing One Slot (MUROS), would help operators in densely populated cities to alleviate the strain on their networks. The concept of MUROS is based on multiplexing two or more users onto one time slot without degrading the speech quality. The authors improved one solution of MUROS, Orthogonal Sub Channel (OSC) in this contribution. For the Down-Link (DL) OSC, they designed new Training Sequence Codes (TSCs) which are low cross-correlated with legacy TSCs. For the Up-Link (UL) OSC, they adopted Successive Interference Cancellation based on Minimum Mean Square Error (MMSE-SIC) algorithm.
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