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Publications (12)2.06 Total impact

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    ABSTRACT: A low-complexity numerical codebook construction method is presented in this paper for limited feedback transmit beamforming systems. The so-constructed codebook takes a DFT matrix structure and achieves equal amplitude beamforming all the time. The codebooks are designed such that the selected row indices mimic the behavior of a difference set which, when exists, is able to achieve codebook optimality. Finite alphabet constraint on the codebook is further studied, where scalar quantization is further applied.
    Consumer Communications and Networking Conference, 2009. CCNC 2009. 6th IEEE; 02/2009
  • Pengfei Xia, Huaning Niu, Jisung Oh, Chiu Ngo
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    ABSTRACT: We study antenna training method for millimeter wave MIMO communication systems and develop iterative antenna training (IAT) algorithm and protocols. The newly developed training method features low training overhead as well as low computation complexity, and has great application potential in practice.
    Vehicular Technology Conference, 2008. VTC 2008-Fall. IEEE 68th; 10/2008
  • Pengfei Xia, Huaning Niu, Jisung Oh, Chiu Ngo
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    ABSTRACT: We study the diversity performance of multiple-input-multiple-output (MIMO) transmit beamforming when perfect channel state information is available at the transmitter side. In particular, we derive the achievable diversity order on each eigenmode in closed form. As an application, the diversity result is applied in average bit error rate (BER) approximation for IEEE 802.11n systems, where approximate BER performance bounds are obtained and further validated by numerical results.
    IEEE Transactions on Vehicular Technology 08/2008; · 2.06 Impact Factor
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    ABSTRACT: Uncompressed HD (high-definition) video delivery over wireless personal area networks (WPANs) is a challenging problem because of the limited bandwidth and variations in channel. The most straight forward technique to recover from channel errors is to retransmit corrupted packets. However, retransmissions introduce significant delay/jitter and require additional bandwidth. Therefore, retransmissions may be unsuitable for uncompressed video streaming. In this paper, we develop, simulate, and evaluate an millimeter- wave (mmWave) system for supporting uncompressed video streams up to 3-Gbps without any retransmissions. New features of the mmWave system incorporates: (i) UEP (unequal error protection) where different video bits (MSBs and LSBs) are protected differently, (ii) a multiple-CRC to determine whether MSB or/and LSB portions are in error, (iii) RS code swapping (RSS), an error concealment scheme which can conceal some errors in video pixels. Simulations using real uncompressed HD images indicate that the proposed mmWave system can maintain good average PSNR (peak-signal-to-noise-ratio) under poor channel conditions, achieving what is generally accepted as a good picture quality with PSNR values greater than 40 dB. Moreover, the proposed system results in less fluctuating PSNR values.
    Conference Proceedings. 01/2008;
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    ABSTRACT: In 60 GHz wireless networks, autonomous coordinator selection is required to find a device to coordinate the transmissions among devices. In order to minimize the power consumption for the coordinator, we utilize the direction information extracted from beamformed transmissions in finding the coordinator automatically. The problem is formulated as a K-center problem, which is a NP-hard problem in general. Analysis is carried out to find optimal solutions in certain tractable topologies. Numerical algorithms and simulation results are further presented for random two dimensional topologies.
    WCNC 2008, IEEE Wireless Communications & Networking Conference, March 31 2008 - April 3 2008, Las Vegas, Nevada, USA, Conference Proceedings; 01/2008
  • Huaning Niu, Pengfei Xia, Jisung Oh, Chiu Ngo
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    ABSTRACT: We study OFDM symbol interleaver design for gigabit per second (Gbps) wireless communications over the millimeter-wave (mmWave) frequency band. A bit-reversal symbol interleaver is proposed, which significantly outperforms conventional block interleaver design. It is demonstrated that the new interleaver design can be naturally combined with FFT operation and simplifies the hardware implementation complexity, which is especially important for several Gbps throughput applications. Simple design parameters are also proposed which serve as new and effective metrics for interleaver designs.
    01/2008;
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    ABSTRACT: In this paper, we discuss multi-gigabits per second wireless networks in the 60GHz millimeter wave frequency band. Despite the large unlicensed bandwidth offered by the 60GHz frequency band, severe technical challenges exist towards making multi-Gbps a reality. We discuss the challenges in three different layers: PHY, MAC and the application layers. We also discuss some important technologies in overcoming these challenges, including antenna array beamforming, baseband modulation, data aggregation. The worldwide 60GHz regulatory and the ongoing standardization efforts are reviewed as well.
    Ultra-Wideband, 2007. ICUWB 2007. IEEE International Conference on; 10/2007
  • Huaning Niu, Chiu Ngo
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    ABSTRACT: Tremendous interest in multimedia applications such as wireless video streaming drives the need for high throughput WLAN communications. Spatial multiplexing and diversity techniques (such as space-time coding and delay diversity) are adopted in the IEEE 802.11n draft specification to fully exploit the benefit of MIMO channel. In this paper, we propose an efficient and simple algorithm that switches between these modes based on the instantaneous channel state information. The post- detection constellation-coding SNR is calculated at the receiver for each mode and is used to derive the switching criterion. The algorithm is designed for practical 802.11n systems with linear receiver and outer forward error correction codes, and does not require complicated eigen-decomposition. Simulations demonstrate the effectiveness of our switching algorithm.
    Signals, Systems and Computers, 2006. ACSSC '06. Fortieth Asilomar Conference on; 12/2006
  • Huaning Niu, Xuemei Ouyang, Chiu Ngo
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    ABSTRACT: Tremendous interest in multimedia applications such as wireless video streaming drives the need for high throughput WLAN communications. In this paper, we study the interleaver design for MIMO-OFDM based high throughput WLAN transmission which enjoys higher spatial diversity and frequency diversity. New design metrics are proposed as the design guideline to maximize the diversity, which can avoid exhaustive search for interleaver parameters. Different interleaver schemes are proposed which provide tradeoff between implementation complexity and performance. Extensive simulation results show that our design metrics are effective and robust to different channel models and the new interleaver design can achieve 1.5 - 2 dB system performance improvement compared to legacy interleaver
    Wireless Communications and Networking Conference, 2006. WCNC 2006. IEEE; 05/2006
  • Pengfei Xia, Huaning Niu, Chiu Y. Ngo
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    ABSTRACT: We study transmit beamforming in IEEE 802.11n systems, where perfect channel state information is available at the transmitter. We first derive the achievable diversity order on each eigenmode. It is found that these eigenmodes are almost Gamma distributed for small number of antennas, which is the typical configuration for IEEE 802.11n systems. Finally, we develop a tight lower- and upper-bound to the average bit error rate performance over each eigenmode.
    Proceedings of the Global Telecommunications Conference, 2006. GLOBECOM '06, San Francisco, CA, USA, 27 November - 1 December 2006; 01/2006
  • Pengfei Xia, Huaning Niu, Chiu Y. Ngo
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    ABSTRACT: We study transmit beamforming in IEEE 802.11n systems, where perfect channel state information is available at the transmitter. We first derive the achievable diversity order on each eigenmode. It is found that these eigenmodes are almost Gamma distributed for small number of antennas, which is the typical configuration for IEEE 802.11n systems. Finally, we develop a tight lower- and upper-bound to the average bit error rate performance over each eigenmode.
    Circuits, Systems and Computers, 1977. Conference Record. 1977 11th Asilomar Conference on 01/2006;
  • Huaning Niu, Chiu Ngo
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    ABSTRACT: First Page of the Article
    Signals, Systems and Computers, 2005. Conference Record of the Thirty-Ninth Asilomar Conference on; 01/2005