MLD Based MIMO-OFDM Demodulation and Decoding LSI with Low Power Consumption for Release 8 LTE

The Long-Term Evolution (LTE), which was specified as the Release 8 specification in the 3 rd Generation P artnership Project (3GPP), will achieve broadband services with the peak data rate of 100 Mbps in the downlink. This paper presents the measured throughput performance a nd power consumption performance of the implemented demodulation and decoding LSI for 2-by-2 M IMO-OFDM in the Rel-8 LT E downlink. The implemented LSI comprises FFT timing detection, a 2048-point FFT, a channel estimation filter, maximum likelihood detection (MLD) based signal detection, a channel deinterleaver, and a turbo decoder with the Max-Log-MAP (maximum a posteriori) algorithm. The most prominent feature of the implemented LSI is MLD based signal detection with low power consumption and a low required received signal-to-noise power ratio (SNR) for 2-by-2 MIMO multiplexing. Experiments show that the implemented LSI achieves the measured throughput of 100 Mbps at the average received SNR of 22 dB with a low power consumption level of approximately 40 mW with 16QAM and the channel coding rate of 8/9.