Mobility

Sounding Reference Signal Design for TDD LTE-Advanced System

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Executive Summary

In the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) Time Division Duplex (TDD) systems, base stations use uplink Sounding Reference Signals (SRSs) to estimate downlink Channel State Information (CSI) for downlink beam-forming transmissions. Because SRSs sent by up to 8 users are multiplexed on the same time-frequency resources, there exist mutual interferences among these SRSs over fading channels. Thus the current scheme inevitably impacts the estimation accuracy of CSI and thereby degrades the beam-forming performance.

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