KBturbo碼中交織器的設(shè)計
INTERLEAVERS FOR KB TURBO CODE
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摘要: 已知比特(KB,Known Bits)turbo碼是采用將KB周期性的插入到信息比特中,不顯著增加系統(tǒng)復(fù)雜程度而較大提高turbo碼譯碼性能。但因為一般采用了隨機(jī)交織器,所以在引入KB方法時,產(chǎn)生了不等差錯保護(hù)的問題。這個問題可以通過采用KB交織器,將KB在交織器中均勻分配來解決。仿真證實,以偽隨機(jī)交織器和S隨機(jī)交織器為基礎(chǔ)的KB交織器可以顯著提高系統(tǒng)性能。而且采用KB turbo碼可以方便地實現(xiàn)速率適配,滿足第三代移動通信系統(tǒng)的要求。
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關(guān)鍵詞:
- 已知比特（KB; Known bits）; Turbo碼; 交織器
Abstract: Known Bits(KB) method is a way of increasing the performance of turbo code by inserting known bits periodically in a code word without increasing in complexity. KB method normally causes uneven protection due to the process of random interleaving. This problem can be solved with a KB interleaver to ensure uniform distribution of KB. It is found that KB interleaver can improve the performance of turbo code with pseudo random interleaver or S-random interleavers. This method also makes a rate-matching to be easy which is fairly important for systems using turbo codes. -
T.T.A.Korea TTA,Global CDMA I:MULTIBAND dIRCT-Sequence CDMA System RTT System Description,Sept,30,1998.[2]D.Divsalar,S.Dolinar,R.J.McEliece,F.Pollara,Transfer function bounds on the performance of trubo codes,JPL TED Progress Report 42-122,1995,Aug,44-55.[3]E.K.Hall,S.G.Wilson,Design and analysis of turbo codes on Rayleigh fading channels.IEEE J.on SAC,1998,16(2),160-174. -
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