The throughput capacity of transmission systems by G.fast technology with crosstalk compensation

In this paper analytical expressions of the signal-to-noise ratio, which allow estimating the throughput capacity of transmission systems by G.fast technology using the «vectoring» crosstalk compensation algorithm, which takes into account not only the uncompensated crosstalk, but also the useful signal power limitation associated with transmitter power normalization are presented. The achievable rates of the G.fast transmission systems operating over a TPP type multi-pair telephone cable and covered with a «vectoring» crosstalk compensation system are defined. The estimates of the throughput capacity of the G.fast transmission systems are given depending on the quantity of mutually influencing transmission channels and parameters of multi-pair telephone cable. The maximum G.fast TS throughput capacity was determined under the condition that there was no external noise and crosstalk, and the effect on the throughput capacity of crosstalk was estimated without «vectoring» algorithm and with «vectoring» algorithm. The effect of the useful signal power limitation when using the «vectoring» algorithm on throughput capacity is evaluated. The estimation of the G.fast TS throughput capacity when operating in the presence of external noise is given.