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A 74.8 mW Soft-Output Detector IC for 8 8 Spatial-Multiplexing MIMO Communications

A 74.8 mW Soft-Output Detector IC for 8 8 Spatial-Multiplexing MIMO Communications,10.1109/JSSC.2009.2037292,IEEE Journal of Solid-state Circuits,Chun

A 74.8 mW Soft-Output Detector IC for 8 8 Spatial-Multiplexing MIMO Communications   (Citations: 2)
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In this paper, VLSI implementation of a configurable, soft-output MIMO detector is presented. The proposed chip can support up to 8 �? 8 64-QAM spatial multiplexing MIMO communications, which surpasses all reported MIMO detector ICs in antenna number and modulation order. Moreover, this chip provides configurable antenna number from 2 �? 2 up to 8 �? 8 and modulation order from QPSK to 64-QAM. Its outputs include bit-wise log likelihood ratios (LLRs) and a candidate list, making it compatible with powerful soft-input channel decoders and iterative decoding system. The MIMO detector adopts a novel sphere decoding algorithm with high decoding efficiency and superior error rate performance, called modified best-first with fast descent (MBF-FD). Moreover, a low-power pipelined quad-dual-heap (quad-DEAP) circuit for efficient node pool management and several circuit techniques are implemented in this chip. When this chip is configured as 4 �? 4 64-QAM and 8 �? 8 64-QAM soft-output MIMO detectors, it achieves average throughputs of 431.8 Mbps and 428.8 Mbps with only 58.2 mW and 74.8 mW respective power consumption and reaches 10-5 coded bit error rate (BER) at signal-to-noise ratio (SNR) of 24.2 dB and 22.6 dB, respectively.
Journal: IEEE Journal of Solid-state Circuits - IEEE J SOLID-STATE CIRCUITS , vol. 45, no. 2, pp. 411-421, 2010
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    • ...MMSE-PIC ASIC with the synthesis results of the SISO STS-SD algorithm presented in [14] and other state-of-the-art non-iterative MIMO detector implementations [6]–[10]...
    • ...For the design in [6], we used the throughput figures stated in the paper, which are, however, only achieved under “good channel conditions” and therefore, represent optimistic performance...
    • ...In summary, the given throughput results favor the implementations [6], [7], [14]...
    • ...We can observe from Table IV that the throughput achieved by the proposed SISO MMSE-PIC implementation is comparable to that achieved by the detectors proposed in [6], [8] and only about 50% smaller than that of [9], [10]...
    • ...It is, however, important to note that our proposed implementation, as in contrast to the implementations of [6], [8]–[10], supports iterative MIMO decoding...
    • ...The missing preprocessing circuitry in [6]–[9], [14] is therefore reflected in lower silicon area, improved hardware-efficiency, lower power consumption, and optimistic energy-efficiency figures...
    • ...If we incorporate the additional preprocessing area of 250 kGE for these designs, the silicon area of the proposed low-complexity SISO MMSE-PIC implementation is in-between that of the detector implementations in [7], [8], [10] and those reported in [6], [9], [14]...
    • ...3) Hardware-Efficiency: Intermsofhardware-efficiency,we attain comparable results as in [6], [7]...
    • ...4) Energy-Efficiency: Our detector exhibits 3 and 2 worse energy-efficiency compared to the designs in [6], [9] and the design in [8], respectively...
    • ...The reason for this penalty is mainly due to i) the preprocessing circuitry present in our design and ii) the fact that the SISO MMSE-PIC ASIC supports iterative MIMO decoding, whereas all other designs reporting energy-efficiency [6], [8], [9] are non-iterative...

    Christoph Studeret al. ASIC Implementation of Soft-Input Soft-Output MIMO Detection Using MMS...

    • ...To obtain MIMO detector performance being equal to or close to the optimal solution, many nonlinear signal detection methods [3]-[8] have been discussed in the literature...
    • ...In addition to DFS and BFS, other MIMO detection approaches such as QOC method [7] and best-first search algorithm [8] were also investigated...

    Jing-Shiun Linet al. Design of high-throughput MIMO detectors using sort-free and early-pru...

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