| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Outline of Final Research Achievements |
This research focuses on an overloaded multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) system. One of the problems in the overloaded MIMO-OFDM system is the performance degradation due to spatial signal multiplexing. In the conventional MIMO system, antenna diversity in a receiver suppresses the performance degradation. Instead, a proposed overloaded MIMO system applies forward error correction coding. With the use of coding, frequency diversity can be realized and it suppresses the performance degradation owing to spatial signal multiplexing. The problem of the use of coding is that the complexity of joint maximum likelihood decoding (MLD) increases exponentially with the number of signal streams. Thus, this research proposes the complexity reduction schemes in the overloaded MIMO-OFDM systems. Furthermore, the joint MLD is applied to user terminals in a non-orthogonal multiple access system for improving the throughput of a NOMA downlink.
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