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A 4 - 4 MIMO-OFDM Baseband Receiver With 160 MHz Bandwidth for Indoor Gigabit Wireless Communications | IEEE Journals & Magazine | IEEE Xplore

A 4 \times 4 MIMO-OFDM Baseband Receiver With 160 MHz Bandwidth for Indoor Gigabit Wireless Communications


Abstract:

This paper presents the design and implementation of a 4 × 4 multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) baseband receiver for i...Show More

Abstract:

This paper presents the design and implementation of a 4 × 4 multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) baseband receiver for indoor high-throughput wireless communication systems. The receiver uses bandwidths of 40, 80, and 160 MHz that correspond to three operation modes of 128, 256, and 512-point FFT, respectively. Four spatial streams are supported to offer the maximum uncoded data rate of 2.6 Gbps. Channel pre-processing based on sorted QR decomposition and the non-constant K-best soft-output MIMO detector are adopted to enhance the system performance. The addressing scheme for the QR phase memory is proposed to deal with the processing-time discrepancy between the write-in and read-out accesses. The high-throughput pipelined architecture for the non-constant K-best soft-output MIMO detector with selected discard-paths is analyzed to show a balance between performance and complexity. This receiver IC integrates 1.034 M logic gates as well as a total of 835 Kb SRAM in 90 nm CMOS technology and can generate hard output for 64-QAM constellation. The coded system performance is also provided with the soft-output MIMO detection. From the measurement results, the power consumption of the chip is 424 mW, 97 mW, and 26 mW at 1.16 V, 0.8 V and 0.66 V, respectively, for operations in 160 MHz, 80 MHz, and 40 MHz bandwidth modes. Compared to the prior works for 80 MHz channel bandwidth, this work supports wider channel bandwidth and achieves higher throughput.
Published in: IEEE Transactions on Circuits and Systems I: Regular Papers ( Volume: 62, Issue: 12, December 2015)
Page(s): 2929 - 2939
Date of Publication: 17 November 2015

ISSN Information:


I. Introduction

The successful deployment of wireless local area networks, such as IEEE 802.11a/b/g/n, makes wireless communications prevailing and indispensable in our daily life. The advent of bandwidth-hungry applications and products, such as video streaming, cellular backhaul, and cellular data offloading, drives the demand for high-throughput wireless communication systems to deliver digital contents in the big-data era [1]. As a result, multi-gigabit wireless communications, standardized in IEEE 802.11ac and 802.11ad, are under development. Some of the key features toward the multi-gigabit wireless include wide signal bandwidth and MIMO techniques. In 802.11ac, channel bandwidths of 40 MHz, 80 MHz, and 160 MHz are supported. With carrier aggregation, the 160 MHz channel bandwidth can be constituted by two contiguous or non-contiguous 80 MHz channels. Besides, with MIMO techniques, the system capacity can be boosted by the spatially-multiplexed streams. A total of eight streams can be transmitted and each user can share up to four data streams.

References

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