An Efficient Scheme to Achieve Differential Unitary Space-Time Modulation on MIMO-OFDM Systems

다국어 초록 (Multilingual Abstract)

Differential unitary space-time modulation (DUSTM)
has emerged as a promising technique to obtain spatial
diversity without intractable channel estimation. This
paper presents a study of the application of DUSTM on
multiple-input multiple-output orthogonal frequency
division multiplexing (MIMO-OFDM) systems with
frequency-selective fading channels. From the view of a
correlation analysis between subcarriers of OFDM, we
obtain the maximum achievable diversity of DUSTM on
MIMO-OFDM systems. Moreover, an efficient
implementation strategy based on subcarrier
reconstruction is proposed, which transmits all the signals
of one signal matrix in one OFDM transmission and
performs differential processing between two adjacent
OFDM blocks. The proposed method is capable of
obtaining both spatial and multipath diversity while
reducing the effect of time variation of channels to a
minimum. The performance improvement is confirmed
by simulation results.

참고문헌 (Reference)

1 B.M. Hochwald, "Unitary Space-TimeModulation for Multiple-Antenna Communications in RayleighFlat Fading" 46 (46): 543-564, Mar.2000

2 B.M. Hochwald,, "Systematic Design of Unitary Space-TimeConstellations" 46 (46): 1962-1973, Sept.2000

3 D. Agrawal,, "Space-TimeCoded OFDM for High Data-Rate Wireless Communication overWideband Channels" Canada 2232-2236, May1998

4 Z. Liu, Y. Xin,, "Space-Time-FrequencyCoded OFDM over Frequency-Selective Fading Channels" 50 (50): 2465-2576, Oct.2002

5 V. Tarokh,, "Space-Time Codesfor High Data Rate Wireless Communication: PerformanceCriterion and Code Construction" 44 (44): 744-765, Mar.1998

6 H. Bolcskei, "Space-Frequency CodedBroadband OFDM Systems" 1-6, Sept.2000

7 B. Lu, "Space-Frequency Code Design in OFDMSystems" 2 : 1000-1004, Dec.2000

8 Y. Zheng, "Improved Models for the Generation ofMultiple Uncorrelated Rayleigh Fading Waveforms" 26 (26): 256-258, December2004

9 K.L Clarkson,, "Fast Multiple-Antenna Differential Decoding" 49 (49): 253-261, Feb.2001

10 J. Wang, "Differential Unitary Space-Time-FrequencyCoding for MIMO OFDM Systems" 2 : 1867-1871, 2002

11 B.M. Hochwald, "Differential Unitary Space-Time Modulation" 48 (48): 2041-2052, Dec.2000

12 H. Li, "Differential Space-Time-Frequency Modulation overFrequency-Selective Fading Channels" 7 (7): 349-351, Aug.2003

13 Q. Ma,, "Differential Space-Time-Frequency Coded OFDM with Maximum Diversity" The Johns HopkinsUniversity 12-14, Mar.2003

14 B.L. Hughes, "Differential Space-Time Modulation" 46 (46): 2567-2578, Nov.2000

15 S.M. Alamouti, "A Simple Transmit Diversity Technique forWireless Communications" 16 (16): 1451-1458, Oct.1998