Closed-Loop Transmit Diversity Techniques for Small Wireless Terminals and Their Performance Assessment in a Flat Fading Channel

다국어 초록 (Multilingual Abstract)

Closed-loop transmit diversity is considered an important technique for improving the link budget in the third generation and future wireless communication standards. This paper proposes several transmit diversity algorithms suitable for small wireless terminals and presents performance assessment in terms of average signal-to-noise ratio (SNR) and outage improvement,convergence, and complexity of operations. The algorithms presented herein are verified using data from measured indoor channels with variable antenna spacing and the results explained using measured radiation patterns for a two-element array. It is shown that for a two-element array, the best among the proposed techniques provides SNR improvement of about 3 dB in a tightly spaced array (inter-element spacing of 0.1wavelength at 2 GHz) typical of small wireless devices.
Additionally, these techniques are shown to perform significantly better than a single antenna device in an indoor channel considering realistic values of latency and propagation errors.

다국어 초록 (Multilingual Abstract)

Closed-loop transmit diversity is considered an important technique for improving the link budget in the third generation and future wireless communication standards. This paper proposes several transmit diversity algorithms suitable for small wireless terminals and presents performance assessment in terms of average signal-to-noise ratio (SNR) and outage improvement,convergence, and complexity of operations. The algorithms presented herein are verified using data from measured indoor channels with variable antenna spacing and the results explained using measured radiation patterns for a two-element array. It is shown that for a two-element array, the best among the proposed techniques provides SNR improvement of about 3 dB in a tightly spaced array (inter-element spacing of 0.1wavelength at 2 GHz) typical of small wireless devices.
Additionally, these techniques are shown to perform significantly better than a single antenna device in an indoor channel considering realistic values of latency and propagation errors.

참고문헌 (Reference)

1 R. Prasad, "Universal Wireless Personal Communications, Chapter6" Artech House Publishers 1998

2 S. Parkvall, "Transmit Diversity in WCDMA: Link and System Level Results" 864-868, 2000

3 T. Hwang, "Transmit Diversity for Down-Link MC-CDMA based on Energy Spreading Transform" 612-616, 2007

4 N. Souto, "Transmit Diversity Schemes for High Speed Downlink Packet Access in 3.5G Cellular Systems" 623-627, 2004

5 "Transmit Diversity Enabled Chipsets from Magnolia"

6 F. Rashid-Farrokhi, "Transmit Beamforming and Power Control for Cellular Wireless Systems" 16 (16): 1437-1449, 1998

7 P. Zetterberg, "The Spectrum Efficiency of a Base Station Antenna Array System for Spatially Selective Transmission" 1517-1521, 1994

8 V.K.N. Lau, "The Role of Transmit Diversity on Wireless Communications-Reverse Link Analysis with Partial Feedback" 50 : 2082-2090, 2002

9 C.B. Dietrich, "Spatial, Polarization, and Pattern Diversity for Wireless Handheld Terminals" 49 (49): 1271-1281, 2001

10 J.-H. Kim, "Reverse Link Capacity and Interference Statistics of DS/CDMA with Transmit Diversity" 4320-4324, 2004

11 M.J. Fakhereddin, "Reduced Feedback and Random Beamforming for OFDM MIMO Broadcast Channels" 57 (57): 3827-3835, 2009

12 ETSI TS 125 214, "Physical Layer Procedures (FDD)"

13 B. Raghothaman, "Performance of Closed Loop Transmit Diversity with FeedbackDelay" 1 : 102-105, 2000

14 J. Choi, "Performance analysis for transmit antenna diversity with/without channel information" IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC 51 (51): 101-113, 2002

15 J. Hamalainen, "Performance Analysis of Closed-Loop Transmit Diversity in the Presence of Feedback Errors" 5 : 2297-2301, 2002

16 E.N. Onggosanusi, "Performance Analysis of Closed-Loop Transmit Diversity in the Presence of Feedback Delay" 49 : 1618-1630, 2001

17 K. Chang, "Open-Loop Transmit Diversity for Broadcast Channel Transmission in E-UTRA" 1293-1297, 2007

18 T.K.Y. Lo, "Maximum Ratio Transmission" 47 (47): 1458-1461, 1999

19 G.H. Golub, "Matrix Computations, 2nd ed" Johns Hopkins University Library Press 1993

20 Qualcomm Inc, "HSPA+ for Enhanced Mobile Broadband"

21 J.W. Liang, "Forward Link Antenna Diversity Using Feedback for Indoor Communication Systems" 1753-1755, 1995

22 V.M. DaSilva, "Fading-Resistant Transmission from Several Antennas" 1218-1222, 1995

23 K.C. Hwang, "Efficient Weight Vector Representation for Closed-Loop Transmit Diversity" 52 (52): 9-16, 2004

24 N.-S. Kim, "Effect of Channel Estimation Errors and Feedback Delay on the Performance of Closed-Loop Transmit Diversity System" 542-545, 2003

25 B.M. Green, "Diversity Performance of Dual- Antenna Handsets Near Operator Tissue" 48 (48): 1017-1024, 2000

26 J.G. Proakis, "Digital Communications, 3rd ed" McGraw Hill 1995

27 R. Mostafa, "Demonstration of Real-Time Wideband Transmit Diversity at the Handset in an Indoor Wireless Channel" 2072-2076, 2001

28 A. Heidari, "Closed-Loop Transmit Diversity with Imperfect Feedback" 9 (9): 2737-2741, 2010

29 Telmo André Rodrigues Batista, "Capacity Increase in UMTS/HSPA+ Through the Use of MIMO Systems" Universidade Tecnica de Lisboa 2008

30 D. Gerlach, "Base Station Transmitting Antenna Arrays for Multipath Environments" 54 (54): 59-73, 1996

31 P. Ming-yu, "A Transmit Antenna Selection Diversity Scheme Based on ACK/NACK Feedback" 24-27, 2009

32 R.W. Heath, "A Simple Scheme for Transmit Diversity Using Partial Channel Feedback" 2 : 1073-1077, 1998

33 S.C. Ip, "A New Fast Sub-Optimal Search Method for Closed-Loop Transmit Diversity System with Limited Number of Feedback Bits" 387-390, 2004