Patent ID: 9042251
Filing Date: 2015-05-26
Classification: H04L

Abstract:
1. A method for predicting a parameter indicative of an achievable bit rate when using a certain configuration in a digital subscriber line, the method comprising: obtaining the following parameters, associated with a known configuration Ci: a Discrete Multi-Tone modulation (DMT) symbol size (Li), a Signal-to-Noise Ratio (SNR) margin, and a first Impulse Noise Protection (INP) parameter associated with a predefined coding gain value γc, where the SNR margin is one of a target SNR margin and an actual SNR margin, and the first INP parameter is one of (a) a minimum INP (INPmin_i) and (b) an actual INP (INPact_i); selecting a new candidate configuration Ci+1 associated with a target SNR margin (γm_i+1) and a second INP parameter (INPmin_i+1), where the INPmin_i+1 value is associated with a predefined coding gain value γc_i+1; and deriving an estimated parameter indicative of at least one of the DMT symbol size Li+1 and the achievable bit rate (Dr_i+1) based on: the obtained parameters, the target SNR margin γm_i+1 of the candidate configuration, and the coding gain value γc_i+1 associated with the second INP parameter INPmin_i+1 of the candidate configuration, thus enabling estimation of the achievable bit rate, Dr_i+1, of the candidate configuration, wherein an estimated DMT symbol size L for a certain configuration is calculated based on the parameters: NSC, γc, γm, SNRk and Pe, where NSC is the number of subcarriers on the line, γc is the coding gain associated with the minimum or actual INP value of the configuration, γm is the target or actual SNR margin of the line, SNRk is the SNR for subcarrier no. k, and Pe is the desired bit error probability, and the DMT symbol size L for a certain configuration is estimated as: where Γ(Pe) is the Shannon gap for the desired bit error probability Pe, and, wherein L should fall within the constraint: where R is the redundancy per Forward Error Correction codeword, and D is the interleaver depth.