【摘要】 为了解决25 Gbit/s及以上的高速串行信号在背板信道传输中的信号完整性问题,研究了能够在高速率和低误码率(BER)之间取得折中效果的部分响应最大似然(PRML)均衡.基于噪声预测法,推导出能够有效降低硬件开销的噪声预测PRML均衡.在具有不同衰减特性的背板信道和不同调制方式下,采用判决反馈均衡(DFE)、PRML均衡和噪声预测PRML均衡3种均衡方式对误码率性能和硬件复杂度进行了研究分析.结果表明,对于25 Gbit/s的非归零(NRZ)信号,噪声预测PRML均衡的误码率性能优于DFE和PRML均衡;而对于12.5 Gbit/s的四电平脉冲振幅调制(4PAM)信号,PRML均衡的误码率性能优于DFE均衡;噪声预测PRML均衡的硬件复杂度优于PRML均衡,更适合应用于高速串行链路中.更多还原

【Abstract】 To solve the problem of signal integrity of high speed serial signal transmission in the backplane channels at or above 25 Gbit/s,the partial response maximum likelihood(PRML) equalization scheme,which can achieve a tradeoff between the high speed and the lowbit error rate(BER),is studied.The noise prediction PRML equalization,which can effectively reduce the hardware cost,is derived based on the noise prediction method.The BER performance and the hardware complexity are analyzed by the decision feedback equalization(DFE),the PRML equalization and the noise prediction PRML equalization,respectively,in the backplane channels with different attenuation characteristics and on the different modulation modes.The results showthat for the 25 Gbit/s non return zero(NRZ) signal,the BER performance of the noise prediction PRML equalization is better than those of the DFE and the PRML equalization.For the 12.5 Gbit/s 4 level pulse amplitude modulation(4PAM) signal,the PRML equalization can obtain better BER performance than the DFE.The hardware complexity of the noise prediction PRML equalization is better than that of the PRML equalization,making it more suitable for high speed serial link.更多还原