Guangguo Bi

Southeast University (China), Nan-ching-hsü, Jiangxi Sheng, China

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Publications (98)22.14 Total impact

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    ABSTRACT: A variable-power (VP) adaptive modulation (AM) scheme with space-time block code (STBC) is developed in MIMO systems, and the corresponding performance is investigated in Nakagami fading channels. The optimum switching thresholds are derived so that the spectrum efficiency (SE) under an average power and a target bit error rate (BER) constraint is maximized. By the switching thresholds, average BER and SE are further derived. As a result, closed-form expressions are obtained. Besides, the exact and approximate BER expressions of VP AM and constant-power (CP) AM systems with delayed feedback are respectively derived. Simulation results show that the theoretical SE and BER can match the corresponding simulation well. The results indicate that VP-AM with STBC provide higher spectrum efficiency than the CP counterparts, and has slighter bite error rate performance degradation when the normalized delay is less than 0.01.
    Sciece China. Information Sciences 10/2012; 56(10). DOI:10.1007/s11432-012-4643-2 · 0.70 Impact Factor
  • Hongjun Wang, Guangguo Bi
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    ABSTRACT: Based on the concept of interference temperature, a novel interference temperature estimation algorithm for cognitive domain, which integrates adaptive line enhancement with multi-taper spectrum estimation and singular value decomposition, is presented with detailed description in this paper. The algorithm provides the reference for communication access, avoidance and power control of cognitive radio subscribers. The performance of the algorithm is analyzed and compared by simulation according to the practical requirement of cognitive radio. The result shows that the proposed algorithm has higher probability.
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    ABSTRACT: The ability to detect the primary user’s signal is one of the main performances for cognitive radio networks. Based on the multi-different-cyclic-frequency characteristics of the cyclostationary primary user’s signal and the cooperation detection advantage of the multi-secondaryuser, the paper presents the weighted cooperative spectrum detection algorithm based on cyclostationarity in detail. The core of the algorithm is to detect the primary user’s signal by the secondary users’ cooperation detection to the multi-different-cyclic-frequency, and to make a final decision according to the fusion data of the independent secondary users’ detection results. Meanwhile, in order to improve the detection performance, the paper proposes a method to optimize the weight on basis of the deflection coefficient criterion. The result of simulation shows that the proposed algorithm has better performance even in low signal-to-noise ratio (SNR).
    01/2012; 7(4). DOI:10.1007/s11460-012-0214-y
  • 01/2012; 42(10):1270. DOI:10.1360/112012-297
  • Jun Wang, Guangguo Bi
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    ABSTRACT: Cognitive radio (CR) is a promising technology. The most fundamental problem of CR is spectrum sensing. Energy detector is often considered for spectrum sensing in CR, and if the noise power is exactly known, energy detector has admirable performance. However, in practice, noise power is always inexactly known. To solve this problem, Dandawate [Dandawate et al. IEEE Transactions on Signal Processing, 1994, 42(9): 2355–2369] has proposed a nonparametric single-cycle detector based on cyclostationarity, which is robust to noise uncertainty. In this paper, based on Dandawate’s single-cycle detector, a joint multi-cycle detector is further proposed, which is also nonparametric and immune from noise uncertainty. Simulation results have shown the validity and superiority over single-cycle detector of the proposed detector.
    Frontiers of Electrical and Electronic Engineering in China 12/2011; 6(4). DOI:10.1007/s11460-011-0180-9
  • Source
    Xiangbin Yu, Guangguo Bi
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    ABSTRACT: Two optimal power control (PC) schemes under the power constraint for space-time coded multiple input multiple output systems over the flat Rayleigh fading channel with the imperfect channel state information (CSI) are presented. One is based on the minimization of a bit error rate (BER), and the other is based on the maximization of a fuzzy signal-to-noise ratio. In these schemes, different powers are allocated to individual transmit antennas rather than equal power in the conventional one. For the first scheme, the optimal PC procedure is developed. It is shown that the Lagrange multiplier for the constrained optimization in the power control does exist and is unique. A practical iterative algorithm based on Newton's method for finding the Lagrange multiplier is proposed. In the second scheme, some existing schemes are included, and a suboptimal PC procedure is developed by means of the asymptotic performance analysis. With this suboptimal scheme, a simple PC calculation formula is provided, and thus the calculation of the PC will be straightforward. Moreover, the suboptimal scheme has the BER performance close to the optimal scheme. Simulation results show that the two PC schemes can provide BER lower than the equal PC and antenna selection scheme under the imperfect CSI.
    Journal of Systems Engineering and Electronics 10/2011; 22(5):730-738. DOI:10.3969/j.issn.1004-4132.2011.05.002 · 0.38 Impact Factor
  • Xiangbin Yu, Xiaomin Chen, Guangguo Bi
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    ABSTRACT: By introducing a full-rate space–time coding (STC) scheme, a synchronous CDMA (code division multiple access) system with full-rate STC is given, and the corresponding uplink performance is investigated in Rayleigh fading channel with imperfect estimation. Considering that existing STC-CDMA system has high decoding complexity, low-complexity multiuser receiver schemes are developed for perfect and imperfect estimations, respectively. The schemes can make full use of the complex orthogonality of STC to reduce the high decoding complexity of the existing scheme, and have linear decoding complexity compared with the existing scheme with exponential decoding complexity. Moreover, the proposed schemes can achieve almost the same performance as the existing scheme. Compared with full-diversity STC-CDMA, the given full-rate STC-CDMA can achieve full data rate, low complexity, and partial diversity, and form efficient spatial interleaving. Thus, the concatenation of channel coding can effectively compensate for the performance loss due to partial diversity. Simulation results show that the full-rate STC-CDMA has lower bit error rate (BER) than full-diversity STC-CDMA systems under the same system throughput and concatenation of channel code. Moreover, the system BER with imperfect estimation are worse than that with perfect estimation due to the estimation error, which implies that the developed multiuser receiver schemes are valid and reasonable. Copyright © 2010 John Wiley & Sons, Ltd. (Based on the imperfect estimation information, a multiuse receiver scheme for full-rate space-time coded CDMA system with estimation error is developed in Rayleigh fading channel. This scheme includes perfect estimation as a special case. It has a lower implement complexity than the existing scheme, and can obtain almost the same performance.)
    International Journal of Communication Systems 03/2011; 24(3):295-309. DOI:10.1002/dac.1154 · 1.11 Impact Factor
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    ABSTRACT: In this article, a new adaptive primary user's signal detection algorithm for cognitive radio, which integrates frequency-domain block adaptive filtering with a matrix accumulation estimation, is presented with detailed description' of the concept and process of the algorithm. Then, the performance of the algorithm is analyzed and compared by simulation according to the practical requirement of cognitive radio. The result shows that the proposed detection algorithm can detect weak signals quickly and effectively with higher detection probability.
    Journal on Advances in Signal Processing 01/2011; 2011(1). DOI:10.1186/1687-6180-2011-51 · 0.81 Impact Factor
  • Mingwei Cao, Guangguo Bi
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    ABSTRACT: A family of space-time block codes (STBCs) for systems with even transmit antennas and any number of receive antennas is proposed. The new codeword matrix is constructed by concatenating Alamouti space-time codes to form a block diagonal matrix, and its dimension is equal to the number of transmit antennas. All Alamouti codes in the same codeword matrix have the same information; thus, full transmit diversity can be achieved over fading channels. To improve the spectral efficiency, multi-level modulations such as multi-quadrature amplitude modulation (M-QAM) are employed. The symbol mapping diversity is then exploited between transmissions of the same information from different antennas to improve the bit error rate (BER) performance. The proposed codes outperform the diagonal algebraic space-time (DAST) codes presented by Damen [Damen et al. IEEE Transactions on Information Theory, 2002, 48(3): 628–636] when they have the same spectral efficiency. Also, they outperform the 1/2-rate codes from complex orthogonal design. Moreover, compared to DAST codes, the proposed codes have a low decoding complexity because we only need to perform linear processing to achieve single-symbol maximum-likelihood (ML) decoding. Keywordsspace-time block codes (STBCs)-symbol mapping-spectral efficiency-decoding complexity-pair-wise error probability (PEP)
    Frontiers of Electrical and Electronic Engineering in China 12/2010; 5(4):464-469. DOI:10.1007/s11460-010-0115-x
  • Jin Tian, Qingdi Ye, Guangguo Bi
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    ABSTRACT: HG is a principal interface device to connect digital home devices of private domain to access network of public domain. HG in the paper is with optical interface as a backbone network access and with UWB interface as an Ad Hoc services access. MB UWB signal based analogy sub-carriers modulation modulates Laser Diode with intensity modulation. OCML consists of an open ended microstrip line with a GaAs substrate as E/O demodulator. The device performance of GaAs substrate is better than that of Ge-on-Si, SiGe/Si, and Si. The research shows that the system with these components is much feasible.
    Optical Communications and Networks (ICOCN 2010), 9th International Conference on; 11/2010
  • International Journal of Electronics 09/2010; 97(9):1035-1049. DOI:10.1080/00207217.2010.482020 · 0.75 Impact Factor
  • Mingwei Cao, Guangguo Bi
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    ABSTRACT: A two-path amplify-and-forward (AF) relaying scheme, which uses two relays to retransmit for the source alternately, was proposed by Rankov [Rankov et al. IEEE Journal on Selected Areas in Communications, 2007, 25 (2): 379–389]. This scheme can avoid half-duplex loss in spectral efficiency, but it cannot work well when the interrelay channel gain is strong. An efficient detection scheme for two-path AF relaying system is proposed in this paper. In the proposed scheme, interference cancellation is first performed at the destination so that the received signal after interference cancellation is the superposition of two symbols with noise. Then, a low complexity soft maximum a posteriori (MAP) decoder and an iterative soft decoder are employed to extract the diversity of the two relay-destination links. The proposed detection scheme can efficiently improve the system performance compared to the detection scheme presented by Rankov (2007), especially when the inter-relay channel gain is strong.
    Frontiers of Electrical and Electronic Engineering in China 01/2010; 5(1):29-35. DOI:10.1007/s11460-009-0077-z
  • Zaichen Zhang, Liang Wu, Guangguo Bi
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    ABSTRACT: This paper propose a new IR-UWB scheme - the OQD IR-UWB scheme. It generates and receives UWB signals through digital ways. A high speed ADC with one-bit quantization is designed for the receiver. It achieves high data rate with reasonable complexity and power consumption, and is easy for implementation on digital IC's. Simulation results show that, at moderate multipath environment, good performance can be achieved at 110 Mbps data rate with simple data recovery algorithm. Details on implementation of the proposed scheme are also discussed.
  • XiangBin Yu, Tao Dong, GuangGuo Bi
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    ABSTRACT: In this paper, by introducing orthogonal space-time coding scheme, the multiuser CDMA systems with different space time codes are given, and corresponding system performance is investigated over Rayleigh fading channel. A low-complexity multiuser receiver scheme is developed for space-time coded CDMA systems. The scheme can make full use of the complex orthogonality of space-time coding to simplify the high decoding complexity of the existing scheme. Compared to the existing scheme with exponential decoding complexity, it has linear decoding complexity. Based on the performance analysis and mathematical calculation, average bit error rate (BER) of the system is derived in detail, and tight closed-form approximation expressions of BER are attained. Simulation results on average BER are in agreement with the theory analysis. The results show that the proposed scheme can achieve almost the same performance as the existing scheme. Moreover, on the condition of same system throughput and concatenation of channel code, the given full-rate space-time coded CDMA system has lower BER than the full-diversity space-time coded CDMA systems.
    Science in China Series F Information Sciences 12/2009; 52(12):2296-2307. DOI:10.1007/s11432-009-0216-4 · 0.66 Impact Factor
  • Xiufeng Jin, Guangguo Bi
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    ABSTRACT: Orthogonal space-time block codes (OSTBCs) have attracted considerable attention due to their low complexity linear decoding and full diversity in Rayleigh fading channels. However, OSTBCs exist only for certain numbers of transmit antennas and do not provide full code rate when more than two transmit antennas are used. In this paper, a novel rate-2 algebraic space-time code that combines coordinate-interleaving and group precoding is proposed. By properly choosing the designed parameters, the coding scheme can achieve full diversity order and high coding gain. The receiver adopts polynomial complexity sphere decoding algorithm to get maximum likelihood (ML) performance. Analysis and simulations illustrate that the new code exhibits significant performance gain over the conventional OSTBCs and diagonal algebraic space-time code.
    Frontiers of Electrical and Electronic Engineering in China 12/2009; 4(4):371-377. DOI:10.1007/s11460-009-0059-1
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    ABSTRACT: Cognitive radio (CR) is a promising wireless communications technology. When using NC (non contiguous)-OFDM to transmit data, CU (cognitive user) promptly evacuates the channel reused for communication once PU's (Primary User's) reappearance is detected, and needs to acquire new channel. One way is to increase modulation rate on remainder uninterfered channels, while the other is to acquire new channels. Acquiring new subcarriers takes a great portion of the link maintenance time. This paper proposes using increased modulation mode to keep the same transmission data rate so that CU can save the time of acquiring new channel. Numerical result shows that the goodput of increased modulation rate method is 14 Mb/s advantageous over that of acquiring new channel.
    Systems, Man and Cybernetics, 2009. SMC 2009. IEEE International Conference on; 11/2009
  • Hongjun Wang, Guangguo Bi
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    ABSTRACT: With the progress of research on cognitive radio in ultra-wideband (UWB) open frequency-band, a joint detection algorithm integrating the energy and bi-spectrum detection is proposed in detail for non-Gaussian signal detection from Gaussian noise. The performance of the algorithm was evaluated by simulation, the result of which indicates that the joint detection not only solves the problem of the signal detection in low signal-to-noise ratio (SNR) but also improves the operational speed and the detection probability. Thus, the joint detection algorithm has definite prospect in practice.
    Frontiers of Electrical and Electronic Engineering in China 09/2009; 4(3):295-299. DOI:10.1007/s11460-009-0049-3
  • XiangBin Yu, GuangGuo Bi, WeiYe Xu
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    ABSTRACT: By introducing a space-time coding scheme based on amicable orthogonality, we develop a distributed differential space-time coding scheme with the amplify-and-forward (AF) method for wireless cooperative networks. The scheme requires no knowledge of the channel state information at both transmitters and receivers, and effectively decreases the realization complexity due to no channel estimation. Moreover, it has lower decoding complexity and higher coding advantage than the existing scheme, thus avoiding the shortcoming of exponential decoding complexity of some existing schemes. According tothe pairwise error probability (PEP) analysis of the system, the power allocations of source and relay terminals are jointly optimized, and as a result, the PEP is minimized, which will provide a helpful guideline for system design. Numerical calculation and simulation results show that the developed scheme is superior to the existing scheme. Moreover, the scheme with optimal power allocation yields obvious performance improvement over that with equal power allocation.
    Science in China Series F Information Sciences 08/2009; 52(8):1418-1427. DOI:10.1007/s11432-009-0117-6 · 0.66 Impact Factor
  • Source
    Mingwei Cao, Guangguo Bi, Xiufeng Jin
    Wireless Sensor Network 01/2009; 1(01):1-6. DOI:10.4236/wsn.2009.11001
  • Xiangbin Yu, Guangguo Bi
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    ABSTRACT: Space-time coding technique and Multi-carrier CDMA (MC-CDMA) technique have been research hotspots due to their high frequency spectrum efficiency and high data rata transmission. On the basis of analyzing the two technique principle, by the use of the optimized complex orthogonal wavelet packet and space-time coding technique, we propose a complex orthogonal wavelet packet based MC-CDMA system with space-time coding, and investigate the system bit error rate performance over Rayleigh fading channel. Theoretical analysis and simulation results show that the proposed complex wavelet packet based MC-CDMA (CWP-MC-CDMA) system outperforms conventional MC-CDMA system and it is slightly superior to the conventional MC-CDMA with cyclic prefix (CP). Without any CP, the system has much higher spectrum efficiency. Especially, the application of space-time coding technique significantly improves the system ability to combat channel fading and various interference. Moreover, the space-time coded CWP-MC-CDMA system has comparative superiority to space-time coded MC-CDMA with CP.

Publication Stats

159 Citations
22.14 Total Impact Points

Institutions

  • 1996–2012
    • Southeast University (China)
      Nan-ching-hsü, Jiangxi Sheng, China
  • 2006
    • Nanjing University of Aeronautics & Astronautics
      • Department of Electrical Engineering
      Nan-ching, Jiangsu Sheng, China
  • 1999
    • City University of Hong Kong
      • Department of Electronic Engineering
      Chiu-lung, Kowloon City, Hong Kong
  • 1997
    • Indiana University Southeast
      Нью-Албани, Indiana, United States