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This paper presents laboratory experimental results on the throughput performance of asymmetric carrier aggregation between the uplink and downlink using an LTE-Advanced testbed. The implemented Base Station (BS) and Mobile Station (MS) transceivers have transmission bandwidth capability of up to 100 MHz (5 Component Carriers (CCs)) and 40 MHz (2 CCs), respectively. The testbed also features CC-specific Adaptive Modulation and Channel coding (AMC) and Hybrid Automatic Repeat reQuest (HARQ) functionalities based on the actually transmitted control signaling. The experimental results show that, in the uplink, CC-based AMC using up to 64QAM high-order modulation is effective in increasing the user throughput in multipath fading channels and achieves a throughput greater than 100 Mbps using carrier aggregation with 2 CCs and 1-by-2 SIMO.
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