Title :
TCP performance analysis and optimization over DMT based ADSL systems
Author :
He, Xiaoning ; Che, Hao
Author_Institution :
Dept. of Electr. Eng., Pennsylvania State Univ., University Park, PA, USA
Abstract :
This paper studies the TCP performance over a DMT based ADSL network. The impact of DMT subchannel bit loading on the TCP throughput performance is studied. The simulation results show that there is a threshold for the signal-to-noise ratio (SNR) gap or bit error rate (BER) above which TCP throughput drops quickly. This threshold takes its value in a wide range depending on the TCP round-trip time as well as channel noise. This suggests that it would be insufficient to set a fixed target BER at, e.g., 10-7, when calculating the number of bits to be loaded in each subchannel. Instead, the bit loading should take TCP performance into account. Finally a dynamic bit loading scheme is proposed, which jointly optimizes the channel bit rate and TCP throughput performance
Keywords :
digital subscriber lines; error statistics; optimisation; transport protocols; BER; DMT based ADSL systems; DMT subchannel bit loading; SNR gap; TCP performance analysis; bit error rate; channel noise; discrete multi-tone modulation; dynamic bit loading scheme; optimization; round-trip time; signal-to-noise ratio; simulation results; throughput performance; Algorithm design and analysis; Bit error rate; Bit rate; Gaussian noise; Heuristic algorithms; OFDM modulation; Performance analysis; Protocols; Signal to noise ratio; Throughput;
Conference_Titel :
Communications, 2001. ICC 2001. IEEE International Conference on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-7097-1
DOI :
10.1109/ICC.2001.936676
