| 摘要 |
<p>A method of shaping a transmit spectrum of a PCM modem comprising: selecting a first symbol from a first subset of predetermined symbols; converting said first symbol to its linear value equivalent representation; applying said linear value to a transmit shaping transfer function to obtain a shaping function result; and using said shaping function result to choose a second subset of predetermined symbols for transmission of a second symbol. A method of shaping a transmit spectrum of a PCM modem, comprising: converting a symbol to its linear value equivalent representation; and, applying said linear value to a transmit shaping transfer function to obtain a shaping cost function result, wherein said transmit shaping transfer is expressed in the form of H(z) = (1 - a1z<-1>) / (1 - b1z<-1>), wherein: a1 and b1 are coefficients selected to represent the desired spectral shape. A method of shaping a transmit spectrum of a PCM modem, comprising: converting a symbol to its linear value equivalent representation; and, applying said linear value to a transmit shaping transfer function to obtain a shaping cost function result, wherein said transmit shaping transfer function is expressed in the form of H(z) = ((1 - a1z<-1>) / (1 - b1z<-1>)) * ((1 - a2z<-1>) / (1 - b2z<-1>)), wherein: a1, a2, b1 and b2 are coefficients selected to represent the desired spectral shape. <IMAGE></p> |
