信号处理
信號處理
신호처리
SIGNAL PROCESSING
2015年
7期
815-822
,共8页
周林%黄伟成%贺玉成%蔡灿辉
週林%黃偉成%賀玉成%蔡燦輝
주림%황위성%하옥성%채찬휘
多元 LDPC 码%速率兼容%自适应编码调制%高阶调制
多元 LDPC 碼%速率兼容%自適應編碼調製%高階調製
다원 LDPC 마%속솔겸용%자괄응편마조제%고계조제
non-binary LDPC code%rate-compatible%adaptive coded modulation%high-order modulation
本文设计了一种基于有限域 GF(q)上的多元速率兼容 LDPC(RC-LDPC)码结合高阶调制的自适应编码调制(Adaptive Coded Modulation,ACM)系统。并提出了多元 RC-LDPC 码在独立和相关衰落信道下的增量冗余型自适应编码调制方案。本方案中多元 LDPC 码码率从1/3到5/6灵活变化,以较低的系统复杂度,有效提高了系统的频带利用率。仿真结果表明:随着系统吞吐率提高,多元 ACM系统相对于二元 ACM系统具有越来越明显的编码增益,最高可达约9 dB。
本文設計瞭一種基于有限域 GF(q)上的多元速率兼容 LDPC(RC-LDPC)碼結閤高階調製的自適應編碼調製(Adaptive Coded Modulation,ACM)繫統。併提齣瞭多元 RC-LDPC 碼在獨立和相關衰落信道下的增量冗餘型自適應編碼調製方案。本方案中多元 LDPC 碼碼率從1/3到5/6靈活變化,以較低的繫統複雜度,有效提高瞭繫統的頻帶利用率。倣真結果錶明:隨著繫統吞吐率提高,多元 ACM繫統相對于二元 ACM繫統具有越來越明顯的編碼增益,最高可達約9 dB。
본문설계료일충기우유한역 GF(q)상적다원속솔겸용 LDPC(RC-LDPC)마결합고계조제적자괄응편마조제(Adaptive Coded Modulation,ACM)계통。병제출료다원 RC-LDPC 마재독립화상관쇠락신도하적증량용여형자괄응편마조제방안。본방안중다원 LDPC 마마솔종1/3도5/6령활변화,이교저적계통복잡도,유효제고료계통적빈대이용솔。방진결과표명:수착계통탄토솔제고,다원 ACM계통상대우이원 ACM계통구유월래월명현적편마증익,최고가체약9 dB。
In this paper,high-order adaptive coded modulation (ACM)schemes based on non-binary rate-compatible (RC) LDPC codes over GF(q)were designed.Further,the incremental redundancy schemes of non-binary RC-LDPC-based ACM system over independent and correlative fading channels were proposed.In the proposed schemes,the LDPC encoder can pro-vide a flexible code-rate range from 1 /3 to 5 /6 by shortening and puncturing algorithm.And the proposed schemes can im-prove the spectrum efficiency of system with little extra complexity.Simulations show that,with higher throughput rate,much more visible even 9 dB coding gain can be obtained by proposed non-binary ACMsystem than binary system.