Cooperative DVB-SH Satellite Broadcasting Systems with Rotated Signal Constellations  

作　　者：Nikos C.Sagias Stylianos Papaharalabos P.Takis Mathiopoulos 

机构地区：[1]Department of Informatics and Telecommunications,University of Peloponnese [2]Laboratory of Wireless Communications,Institute of Informatics and Telecommunications,National Centre for Scientific Research"Demokritos," Patriarhou Grigoriou and Neapoleos street,Agia Paraskevi,15 310 Athens,Greece [3]Department of Informatics and Telecommunications,University of Athens

出　　处：《China Communications》2015年第6期59-72,共14页中国通信（英文版）

基　　金：Support to the SatNEx-Ⅲ Network of Experts (SatNEx-Ⅲ) CoO2,2011-2012

摘　　要：In this paper,we study the advantages of cooperation in broadcasting systems from a geosynchronous earth orbit(GEO)satellite to mobile terminals(MTs),achieved through a terrestrial complementary ground station(CGS) with fixed installment,which acts as a relay.Moreover and in the context of the digital video broadcasting-satellite-to-handheld(DVB-SH) standard,the performance improvements offered by the rotated constellations method are investigated,where prior transmission,a phase rotation of the transmitted symbols by a fixed angle is applied followed by a random component interleaver.Turbo codes with soft decision decoding and appropriate random channel interleavers are also considered.We present analytical expressions for the bit log-likelihood ratios(LLRs)that are needed for soft decision decoding at the MT turbo decoder,while the code combining technique is adapted to improve the end-to-end(E2E) performance.Then,we obtain through extensive computer simulations the average bit error probability(ABEP) of quadrature phase-shift keying(QPSK) signals received over pure land-mobile satellite(LMS)and pure CGS links for coding rates 1/3 and6/7.Moreover,the optimal rotation angles are obtained for both links.E2 E ABEP results are then presented assuming cooperation between GEO and CGS,while the power allocation issue is investigated under fixed total transmission power.Our performance evaluation results show that by using the constellation rotation technique,a performance gain can be achieved for high coding rates.In this paper, we study the advan- tages of cooperation in broadcasting systems from a geosynchronous earth orbit （GEO） satellite to mobile terminals （MTs）, achieved through a terrestrial complementary ground station （CGS） with fixed installment, which acts as a relay. Moreover and in the con- text of the digital video broadcasting-satel- lite-to-handheld （DVB-SH） standard, the per- formance improvements offered by the rotated constellations method are investigated, where prior transmission, a phase rotation of the transmitted symbols by a fixed angle is applied followed by a random component interleaver. Turbo codes with soft decision decoding and appropriate random channel interleavers are also considered. We present analytical expres- sions for the bit log-likelihood ratios （LLRs） that are needed for soft decision decoding at the MT turbo decoder, while the code com- bining technique is adapted to improve the end-to-end （E2E） performance. Then, we ob- tain through extensive computer simulations the average bit error probability （ABEP） of quadrature phase-shift keying （QPSK） signals received over pure land-mobile satellite （LMS） and pure CGS links for coding rates 1/3 and 6/7. Moreover, the optimal rotation angles are obtained for both links. E2E ABEP results are then presented assuming cooperation between GEO and CGS, while the power allocationissue is investigated under fixed total trans- mission power. Our performance evaluation results show that by using the constellation rotation technique, a performance gain can be achieved for high coding rates.

关 键 词：BROADCASTING code combining constellation rotation coding rate comple-mentary ground system （CGS） coopera-tion digital video broadcasting satellite-to-hand-held （DVB-SH） DECODE-AND-FORWARD log-likelihood ratio （LLR） quadrature phase-shift keying （QPSK） orthogonal frequency-di-vision multiplexing （OFDM） relays satellitecommunications soft-decision decoding tur-bo codes random interleavers 

分 类 号：TN938[电子电信—信号与信息处理] TN946.2[电子电信—信息与通信工程]