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基于8B/10B扰码理论的RS485通信技术研究 被引量:2
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作者 覃志松 林科 黄廷磊 《信息通信》 2013年第4期1-3,共3页
RS485通信在工业场合应用非常广泛,特别是在煤矿井下,经常采用这种传输方式进行远距离通信。但是,由于长距离通信电缆具有寄生电容等因素,使得传统的传输方法遇到特定的不平衡序列时,传输波形容易发生失真,为了避免这种情况,采用通信上... RS485通信在工业场合应用非常广泛,特别是在煤矿井下,经常采用这种传输方式进行远距离通信。但是,由于长距离通信电缆具有寄生电容等因素,使得传统的传输方法遇到特定的不平衡序列时,传输波形容易发生失真,为了避免这种情况,采用通信上广为应用的8B/10B扰码通信方法,将需要发送的数据经过扰码编码后再传输,接收端将收到的数据解码后还原原始数据。由于该通信方式将传输的数据充分的平衡和整型,有利于接收端的同步接收和解码。通过仿真数据也说明,在同样的条件下,采用8B/10B扰码通信方法比传统的RS485通信方法更有优势。这种通信方式计算简单,对硬件资源要求不高,特别适用于煤矿井下的RS485远距离通信。 展开更多
关键词 8B 10B 扰码编码 RS485通信
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Hybrid coordinated strategy of downlink coordinated multi-point transmission 被引量:2
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作者 Zhuoming Li Yuqi Liu +3 位作者 Yu Zhang Peng Wang Chunyang Tian Xuejun Sha 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2015年第5期916-923,共8页
Coordinated multi-point (CoMP) transmission is put forward in the long term evolution-advanced (LTE-A) system to improve both average and cell-edge throughput. CoMP-joint pro- cessing (JP) scheme can get a large... Coordinated multi-point (CoMP) transmission is put forward in the long term evolution-advanced (LTE-A) system to improve both average and cell-edge throughput. CoMP-joint pro- cessing (JP) scheme can get a larger cell-edge throughput and a lower bit error rate (BER) than the CoMP-coordinated beamform- ing (CB) scheme, but it also has higher complexity due to data sharing. A hybrid coordinated strategy with parameter c~, which indicates the proportion of users employing the CoMP-JP scheme, is proposed to apply the CoMP-JP scheme to improve the poorer communication quality of cell edge and employ the CoMP-CB scheme for other users to enhance average throughput and spec- tral efficiency. This paradigm selects users defined by the certain threshold of signal to interference plus noise power ratio (SINR) corresponding to the parameter a to the CoMP-JP scheme. This paper compares the BER performance between the block diag- onalization (BD) based precoding and the linear precoders by maximizing signal to leakage and noise ratio (SLNR), and also in- dicates that the SLNR based precoding algorithm gets lower BER than the BD based precoding algorithm with certain signal-to-noise ratios (SNRs). Finally, this paper discusses that the system perfor- mance is partially affected by the percentage of CoMP-JP users and concludes that 50% of users sorted to communicate under the CoMP-JP scheme will reach the best system performance. 展开更多
关键词 coordinated multi-point (CoMP) block diagonalization(BD) signal to leakage and noise ratio (SLNR) hybrid coordinatedstrategy
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