Soft Handoff and Uplink Capacity in a Two-Tier CDMA System

Details Soft Handoff and Uplink Capacity in a Two-Tier CDMA System Soft Handoff and Uplink Capacity in a Two-Tier CDMA System

2005-03-18

arxiv.org/abs/cs/0503041v1

Computer Science

Information Theory

To appear in IEEE Transactions on Wireless Communications

Scientific paper

This paper examines the effect of soft handoff on the uplink user capacity of a CDMA system consisting of a single macrocell in which a single hotspot microcell is embedded. The users of these two base stations operate over the same frequency band. In the soft handoff scenario studied here, both macrocell and microcell base stations serve each system user and the two received copies of a desired user's signal are summed using maximal ratio combining. Exact and approximate analytical methods are developed to compute uplink user capacity. Simulation results demonstrate a 20% increase in user capacity compared to hard handoff. In addition, simple, approximate methods are presented for estimating soft handoff capacity and are shown to be quite accurate.

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