雙迭代級(jí)聯(lián)譯碼的Turbo V-BLAST結(jié)構(gòu)
Double-Iterated Concatenated Decoding for Turbo V-BLAST System
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摘要: 垂直貝爾實(shí)驗(yàn)室分層空時(shí)(V-BLAST)方案能有效提高系統(tǒng)的信道容量而成為研究的熱點(diǎn)。但多發(fā)送天線造成了接收信號(hào)的空間干擾，這嚴(yán)重造成了誤比特(誤幀)系統(tǒng)性能的下降。在接收端，采用了迫零(Zero-forcing)排序的迭代混合干擾消除(Hybird Interference Cancellation，HIC)算法，相比迫零排序的串行干擾消除(Serial Interference Cancellation，SIC)算法，在降低復(fù)雜度的同時(shí)提高系統(tǒng)性能。干擾消除后的軟信息經(jīng)過Turbo迭代譯碼，得到的硬判決信息可以反饋回到V-BLAST的迭代ZF-HIC干擾檢測(cè)，進(jìn)行系統(tǒng)級(jí)聯(lián)迭代。因此，文中的Turbo V-BLAST結(jié)構(gòu)具有雙迭代級(jí)聯(lián)的多迭代環(huán)特征。仿真證明能很大程度上改進(jìn)系統(tǒng)的BER和FER，是一種理想的系統(tǒng)結(jié)構(gòu)。
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關(guān)鍵詞:
- Turbo; V-BLAST; 混合干擾消除; 串行干擾消除; 迭代
Abstract: Vertical Bell Labs Layered Space Time (V-BLAST) scheme improves greatly system channel capacity, however multi-transmit antennas introduce space interference, which degrades sharply BER (FER) performance. In order to overcome effectively the space interference, an iterative ordered Zero-Forcing Hybird Interference Cancellation (ZF-HIC) algorithm is adopted. Compared to conventional Zero-Forcing Serial Interference Cancellation (ZF-SIC) algortithm, ZF-HIC provides better BER and FER performance with a lower computational complexity. Soft-information after ZF-HIC detector is sent to Turbo iterative decoding and the resulting hard decision-information can be sent back to V-BLAST detector again to further update and improve the performance of ZF-HIC detector. So, the Turbo V-BLAST has the double-iterated concatenated decoding structure. The simulation results are presented to verify its advantages. -
Telatar E. Capacity of multi-antenna Gaussian channels[J].European Transactions on Telecommunications.1999, 10(6):585-595[2]Foschini G J. Layered space-time architecture for wireless communication in a fading environment when using multi-element antennas. Bell Labs Technical Journal, 1996, Autumn: 41-59.[3]Wolniansky P W, Foschini G J. V-BLAST: An architecture for realizing very high data rates over the rich-scattering wireless channel. URSI International Symposium on Signals Systems and Electronics(ISSSE), PISA ITALY, 29 Sept.-2 Oct.,1998: 295-300.[4]Golden G D, Foschini G J. Dectecton algorithm and initial laboratory results using V-BLAST space-time communication architecture[J].Electron. Lett.1999, 35(1):14-16[5]Biglieri E, Taricco G, Tulino A. Decoding space-time codes with BLAST architectures[J].IEEE Trans. on Signal Processing.2002, 50(10):2547-2552[6]Li Yuan, Luo Zhi-quan. Parallel detection for V-BLAST system.IEEE Int. Conf. on Communications(ICC), 28 April.2 May, 2002, 1: 340-344.[7]Berrou C, Glavieux A, Thitimajshima P. Near Shannon limit error-correcting coding and decoding: Turbo- codes. IEEE Int. Conf. on Communications(ICC), Geneva Switzerland, May, 93: 1064-1070.[8]Malik R, Dubey V K, McGuffin B. A hybrid Interference canceller for CDMA systems in Rayleigh fading channels. Vehicular Technology Conference (VTC), 6-9 May, 2001, 2: 1523 - 1527. -
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