MIMO in Integrated/Hybrid Satellite-Terrestrial Systems

Transcription

1 University of Oulu Wireless Communications Research Seminar 16 TH February 2012 MIMO in Integrated/Hybrid Satellite-Terrestrial Systems Antti Roivainen (1), Jukka Kyröläinen (2), Wei Li (3), Visa Tapio (1), Aaron Byman (2) (1) Centre for Wireless Communications, University of Oulu, Finland (2) Elektrobit Corporation, Oulu, Finland (3) Renesas Mobile, Oulu, Finland

2 2 Introduction Overview of the DVB-SH system Evaluation of MIMO techniques in DVB-SH A novel Space-Time Block Code for distributed MIMO systems Conclusions Outline

3 3 Integrated/hybrid system Satellite component (SC) Ground component Target Worldwide communication/broadcasting Motivation Introduction Only few studies related MIMO in integrated/hybrid system MIMO techniques are not yet applied to DVB- SH standard

4 4 Introduction Hybrid system [1] Interconnected but operate independently of each other Not necessarily operate in the same frequency band [1] Annex 12 to ITU-R Working Party 4B Chairman s Report on the Twenty Sixth Meeting. Document 4B/85, 27 May 2009.

5 5 Introduction Integrated system [1] Terrestrial component is complementary ground component (CGC) Satellite and CGC use the same portions of frequency bands

6 6 Overview of the DVB-SH system Digital Video Broadcasting - Satellite services to Handhelds (DVB-SH) system is used in a study of MIMO techniques in integrated/hybrid networks

7 7 Overview of the DVB-SH system Reception conditions & environments Urban The coverage is mainly provided by the CGC (weak satellite component) Suburban The user terminal receives the signal from both the satellite and the repeaters Rural The coverage is mainly provided by the SC

8 8 Evaluation of MIMO techniques in DVB-SH Definitions Full diversity: n t n r Full Rate: min(n t,n r ) complex symbols per channel use Decoding Complexity: the minimum number of values of code matrix X that should be computed simultaneously transmitted symbols in Maximum- Likelihood (ML) decoding the squared Euclidean distance between the received noisy signal and the noiseless signal

9 9 Evaluation of MIMO techniques in DVB-SH Performance evaluation metrics Bit Error Rate (BER) ESR5(20) Ratio of time windows for which ESR5 criterion is fulfilled ESR5 criterion: In time interval of 20 seconds at most one second in error allowed The same data rate with different techniques

10 10 Evaluation of MIMO techniques in DVB-SH MIMO 2 x 2 Note: SISO QPSK (blue curve) has 0.5 x data rate of other schemes

11 11 Evaluation of MIMO techniques in DVB-SH MIMO 4 x 2

12 12 A novel Space-Time Block Code for distributed MIMO systems 3D-Space-Time-Space block code have been proposed for integrated systems Double layer coding Inner layer coding Golden code [3] is applied for SC and CGC Outer layer coding Drawback Alamouti to combining SC and CGC Decoding complexity is M 8,where M is constellation size [3] J.-C. Belfiore, G. Rekaya, and E. Viterbo, The golden code: A 2x2 full-rate space-time code with nonvanishing determinants, IEEE Trans.Inf. Theory, vol. 51, no. 4, pp , 2005.

13 13 Objective A novel Space-Time Block Code for distributed MIMO systems Design STBC, which offers Full diversity and rate Lower decoding complexity Code design Family II STBC [4] as an inner layer coding for both links and Alamouti coding as an outer layer coding to combining links [4] S. Sezginer and H. Sari, Full-rate full-diversity 2x2 space-time codes of reduced decoder complexity, IEEE Commun. Lett., vol. 11, no. 12, pp , 2007.

14 14 A novel Space-Time Block Code for distributed MIMO systems Code matrix Where, b= and d =-jb Decoding a c 1/ Presented in [5] j [5] Roivainen A., Kyröläinen J. and Juntti M., New Double Layer Space-Time Block Code for Distributed 4 x 2 MIMO Systems,accepted to WCNC 2012, Paris, France, 1-4 Apr Roivainen, Kyröläinen

15 15 A novel Space-Time Block Code for distributed MIMO systems STBC Divers. Compl. SL SM - M 2 SL Golden SL Family II 4 M 4 4 M 2 DL SM 4 M 4 3D-STS 8 M 8 Proposed 8 M 6

16 16 The performance of several MIMO techniques have been evaluated in DVB-SH system A novel MIMO technique for distributed system have been developed Applicable to integrated satellite-terrestrial systems Future work Conclusions Integration of satellite component and LTE Satellite component influence to LTE network

17 17 THANK YOU!