CAJ | 학술논문

在基于正交频分多址技术的宽带网络中，通过把竞争分散到多个子信道能有效改善随机接入的性能。然而多信道特性也会使传统基于Request-To-Send （RTS ）控制帧的随机接入协议面临子信道空闲、RTS传输时间延长、上行复杂的问题。针对这些问题，在本文所提出的接入方法中，用户在没有被分配到资源时通过在随机子载波上发送信号来请求传输机会，与此同时，接入点对这些信号侦听，并根据子载波忙闲状态确定哪些用户可以接入。理论分析及仿真结果表明，相比传统依靠RTS的接入方法，采用子载波侦听，系统将获得更高的吞吐量。
재기우정교빈분다지기술적관대망락중，통과파경쟁분산도다개자신도능유효개선수궤접입적성능。연이다신도특성야회사전통기우Request-To-Send （RTS ）공제정적수궤접입협의면림자신도공한、RTS전수시간연장、상행복잡적문제。침대저사문제，재본문소제출적접입방법중，용호재몰유피분배도자원시통과재수궤자재파상발송신호래청구전수궤회，여차동시，접입점대저사신호정은，병근거자재파망한상태학정나사용호가이접입。이론분석급방진결과표명，상비전통의고RTS적접입방법，채용자재파정은，계통장획득경고적탄토량。
In the orthogonal frequency division multiple access (OFDMA)wireless broadband networks ,the efficiency of ran-dom access can be improved by distributing contention onto multiple channels .However ,due to the multichannel property ,the tradi-tional systems based on request-to-send (RTS )control frame have to encounter the idleness of subchannel ,the extension of RTS transmission time and the complex synchronization of uplink communication .To solve these problems ,in our scheme ,the users send signals on random subcarrier to request transmission opportunity .The access point senses these request signals ,and determines which user is permitted to access channel according to the busy state of the subcarriers .The theoretical analysis and simulation results both show that our scheme outperforms the traditional RTS-based schemes in term of the throughput .