A Power Efficient Baseband Engine for Multiuser Mobile MIMO-OFDMA Communications

In this paper, the authors present a configurable and power efficient multiuser MIMO-OFDMA baseband processor for uplink mobile communications. To solve the carrier frequency offset (CFO) problem in multiuser transmission, an inter-carrier interference-based (ICI-cancellation-based) CFO estimator is implemented based on an iterative search criterion of minimum signal-to-interference-noise (SINR) ratio. Compared to the state-of-the-art methods, the proposed CFO estimator is more robust to transmission configurations (MIMO and multiuser) and CFO variations. Moreover, the authors propose an efficient architecture that saves 78% of the hardware complexity compared to the direct implemented architecture by employing Taylor series expansion for ICI/multiple-access interference (MAI) cancellation. Meanwhile, a 2-D linear channel estimator is also proposed to assist the CFO estimator and track the time-variant multipath channel. Two kinds of MIMO detector, vertical Bell Laboratory layered space-time (V-BLAST) and V-BLAST with maximum likelihood (V-ML), are adopted to minimize output latency and achieve the best ML bit-error-rate (BER) performance. An ASIC fabricated by 0.13 μm 1P8M CMOS technology is measured with 2.31 Mbps/mW power efficiency and less than 1.5 dB implementation loss. In addition, the whole transceiver is integrated and verified by a system-on-chip (SoC) platform to demonstrate its efficacy.

[1]  Ieee Microwave Theory,et al.  Part 16: Air Interface for Fixed and Mobile Broadband Wireless Access Systems — Amendment for Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands , 2003 .

[2]  Hsi-Pin Ma,et al.  A low complexity scalable MIMO detector , 2006, IWCMC '06.

[3]  Khaled Ben Letaief,et al.  An interference-cancellation scheme for carrier frequency offsets correction in OFDMA systems , 2005, IEEE Transactions on Communications.

[4]  Geoffrey Ye Li,et al.  Broadband MIMO-OFDM wireless communications , 2004, Proceedings of the IEEE.

[5]  Hlaing Minn,et al.  Initial uplink synchronization and power control (ranging process) for OFDMA systems , 2004, IEEE Global Telecommunications Conference, 2004. GLOBECOM '04..

[6]  Hugo De Man,et al.  A digital 72Mb/s 64-QAM OFDM tranceiver for 5GHz wireless LAN in 0.18µm CMOS , 2001 .

[7]  Yu-Dong Yao,et al.  Deterministic multiuser carrier-frequency offset estimation for interleaved OFDMA uplink , 2004, IEEE Transactions on Communications.

[8]  Pei-Yun Tsai,et al.  A Low-Power Multicarrier-CDMA Downlink Baseband Receiver for Future Cellular Communication Systems , 2007, IEEE Transactions on Circuits and Systems I: Regular Papers.

[9]  Luc Deneire,et al.  80-Mb/s QPSK and 72-Mb/s 64-QAM flexible and scalable digital OFDM transceiver ASICs for wireless local area networks in the 5-GHz band , 2001 .

[10]  Shousheng He,et al.  Designing pipeline FFT processor for OFDM (de)modulation , 1998, 1998 URSI International Symposium on Signals, Systems, and Electronics. Conference Proceedings (Cat. No.98EX167).

[11]  T.C.W. Schenk,et al.  Frequency synchronization for MIMO OFDM wireless LAN systems , 2003, 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484).

[12]  Sae-Young Chung,et al.  Design of ICI Canceling Codes for OFDM Systems Based on Capacity Maximization , 2007, IEEE Signal Processing Letters.

[13]  C. Tellambura,et al.  Transmitter precoding for ICI reduction in OFDM systems , 2005, 2005 IEEE 61st Vehicular Technology Conference.

[14]  Shixin Cheng,et al.  Combined maximum likelihood and ordered successive interference cancellation grouped detection algorithm for multistream MIMO , 2004, Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738).

[15]  Hsi-Pin Ma,et al.  A Power-Efficient Configurable Low-Complexity MIMO Detector , 2009, IEEE Trans. Circuits Syst. I Regul. Pap..

[16]  Hsi-Pin Ma,et al.  A high performance baseband transceiver for SISO-/MIMO-OFDA uplink communications , 2009, IEEE Transactions on Wireless Communications.

[17]  B. Daneshrad,et al.  32 mW self contained OFDM receiver ASIC for mobile cellular applications , 2004, 2004 Symposium on VLSI Circuits. Digest of Technical Papers (IEEE Cat. No.04CH37525).

[18]  Ming-Xian Chang,et al.  A Novel Algorithm of Inter-Subchannel Interference Self-Cancellation for OFDM Systems , 2007, IEEE Transactions on Wireless Communications.

[19]  Pangan Ting,et al.  A Baseband Transceiver for IEEE 802.16e-2005 MIMO-OFDMA Uplink Communications , 2007, IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference.

[20]  Jen-Ming Wu,et al.  Design and Implementation of Low Power Baseband Receiver IC for Fixed WiMAX Communication , 2007 .

[21]  Yu-Dong Yao,et al.  Efficient structure-based carrier frequency offset estimation for interleaved OFDMA uplink , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[22]  C.-C. Jay Kuo,et al.  An EM-based joint maximum likelihood estimation of carrier frequency offset and channel for uplink OFDMA systems , 2004, IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004.

[23]  Chintha Tellambura,et al.  A Technique for Multiuser and Intercarrier Interference Reduction in Multiple-Antenna Multiuser OFDM Downlink , 2007, IEEE Transactions on Wireless Communications.

[24]  Jean-Pierre Cances,et al.  EM-based Joint ML Estimation of Carrier Frequency Offset and Channel Coefficients in MIMO-OFDM Systems , 2007, 2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications.

[25]  Heinrich Meyr,et al.  Optimum receiver design for OFDM-based broadband transmission .II. A case study , 2001, IEEE Trans. Commun..

[26]  Georgios B. Giannakis,et al.  Blind carrier frequency offset estimation in SISO, MIMO, and multiuser OFDM systems , 2005, IEEE Transactions on Communications.

[27]  Hüseyin Arslan,et al.  ICI Cancellation Based Channel Estimation for OFDM Systems , 2005, IEICE Trans. Commun..

[28]  Jianhua Lu,et al.  Nonpilot-aided carrier frequency tracking for uplink OFDMA systems , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).

[29]  Jen-Ming Wu,et al.  A low power baseband OFDM receiver IC for fixed WiMAX communication , 2007, 2007 IEEE Asian Solid-State Circuits Conference.

[30]  Sergio Barbarossa,et al.  Channel-independent synchronization of orthogonal frequency division multiple access systems , 2002, IEEE J. Sel. Areas Commun..

[31]  C.-C. Jay Kuo,et al.  Maximum-likelihood synchronization and channel estimation for OFDMA uplink transmissions , 2006, IEEE Transactions on Communications.

[32]  Koushik Maharatna,et al.  Low-Power VLSI Implementation of the Inner Receiver for OFDM-Based WLAN Systems , 2008, IEEE Transactions on Circuits and Systems I: Regular Papers.

[33]  M.-E. Grandmaison,et al.  Channel Estimation Algorithms for Uplink OFDMA Tiles , 2007, 2007 2nd International Symposium on Wireless Pervasive Computing.

[34]  David W. Lin,et al.  Joint Detection of Integral Carrier Frequency Offset and Preamble Index in OFDMA WiMAX Downlink Synchronization , 2007, 2007 IEEE Wireless Communications and Networking Conference.

[35]  Jaeseok Kim,et al.  Design and Implementation of MIMO-OFDM Baseband Processor for High-Speed Wireless LANs , 2007, IEEE Transactions on Circuits and Systems II: Express Briefs.

[36]  Zhongshan Zhang,et al.  Robust uplink carrier frequency offset estimation with interference mitigation in OFDMA systems , 2006, IEEE Wireless Communications and Networking Conference, 2006. WCNC 2006..

[37]  Xing Zhang,et al.  Synchronization algorithms for MIMO OFDM systems , 2005, IEEE Wireless Communications and Networking Conference, 2005.

[38]  Hannu Tenhunen,et al.  A new VLSI-oriented FFT algorithm and implementation , 1998, Proceedings Eleventh Annual IEEE International ASIC Conference (Cat. No.98TH8372).

[39]  Dong Li,et al.  A Novel Timing Synchronization Method for Distributed MIMO-OFDM System , 2006, 2006 IEEE 63rd Vehicular Technology Conference.