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一种基于查表式编码和译码的交错纠错法
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作者 杨雄 王茁 金西 《微计算机信息》 1999年第6期16-17,共2页
本文提出了一种用于电力线载波数据传输系统的纠借方法,该方法采用查表式编码和译码,并结合了交错传输方式,从而使整个纠错电路具有实现简单、成本低、数据传输性能好等优点,同时具有很强的纠错能力,完全能满足各种电网管理自动化... 本文提出了一种用于电力线载波数据传输系统的纠借方法,该方法采用查表式编码和译码,并结合了交错传输方式,从而使整个纠错电路具有实现简单、成本低、数据传输性能好等优点,同时具有很强的纠错能力,完全能满足各种电网管理自动化系统的使用要求。 展开更多
关键词 编码 译码 交错纠错法 查表 信道 电子线载波
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Optimal subcarrier allocation for cognitive radio with multi-user OFDM and distributed antenna 被引量:1
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作者 葛文栋 纪红 +1 位作者 司鹏搏 李曦 《Journal of Southeast University(English Edition)》 EI CAS 2010年第4期513-517,共5页
The subcarrier allocation problem in cognitive radio(CR)networks with multi-user orthogonal frequency-division multiplexing(OFDM)and distributed antenna is analyzed and modeled for the flat fading channel and the ... The subcarrier allocation problem in cognitive radio(CR)networks with multi-user orthogonal frequency-division multiplexing(OFDM)and distributed antenna is analyzed and modeled for the flat fading channel and the frequency selective channel,where the constraint on the secondary user(SU)to protect the primary user(PU)is that the total throughput of each PU must be above the given threshold instead of the "interference temperature".According to the features of different types of channels,the optimal subcarrier allocation schemes are proposed to pursue efficiency(or maximal throughput),using the branch and bound algorithm and the 0-1 implicit enumeration algorithm.Furthermore,considering the tradeoff between efficiency and fairness,the optimal subcarrier allocation schemes with fairness are proposed in different fading channels,using the pegging algorithm.Extensive simulation results illustrate the significant performance improvement of the proposed subcarrier allocation schemes compared with the existing ones in different scenarios. 展开更多
关键词 cognitive radio subcarrier allocation multi-user OFDM distributed antenna branch and bound algorithm implicit enumeration algorithm pegging algorithm
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Subcarrier and power allocation in OFDM-based cognitive radio networks
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作者 毛旭 Ji Hong Li Ming Fu Jiadi 《High Technology Letters》 EI CAS 2011年第1期69-74,共6页
We formulate the subcarrier and power allocation problem in cognitive radio networks employing orthogonal frequency division multiplexing (OFDM) as a non-linear optimization problem with the objective of maximizing ... We formulate the subcarrier and power allocation problem in cognitive radio networks employing orthogonal frequency division multiplexing (OFDM) as a non-linear optimization problem with the objective of maximizing sum capacity under constraints of available subcarriers, interference temperature, power budget, etc. A close-to-optimal solution with much reduced complexity is proposed to separate the problem into two steps, which also considers fairness among secondary users. A fair al- gorithm for subcarrier allocation (FA_SA) is firstly presented. Secondly, a fast iterative water-filling algorithm for power allocation (FIWFA_PA) is also proposed to maximize the sum capacity. Exten- sive simulation results show that sum capacity performance of our low-complexity solution is very close to the optimal one, while significantly improving fairness and reducing computation complexity compared with the existing solutions. 展开更多
关键词 cognitive radio (CR) orthogonal frequency division multiplexing (OFDM) iterative water-filling LOW-COMPLEXITY capacity maximization FAIRNESS
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