Trellis Coding in a Discrete Multitone Modulation System
نویسندگان
چکیده
Discrete Multitone (DMT) modulation is a multicarrier technique which makes efficient use of the channel, maximizing the throughput by sending different numbers of bits on different subchannels. The number of bits on each subchannel depends on the Signal-to-Noise Ratio of the subchannel. The performance of a DMT system can be further increased by using powerful coding techniques. This paper investigates an implementation of trellis coded modulation in a DMT system intended for transmission over short copper cables, less than 1000m. The suggested trellis code is Wei’s 4-dimensional 16-state coder combined with trellis shaping. A single encoder is used which codes across the tones of each DMT-symbol. At a bit error probability of 10-7, the suggested code gains 45 dB over uncoded transmission.
منابع مشابه
Coding in a Discrete Multitone Modulation System
Discrete Multitone (DMT) modulation is a multicarrier technique which makes efficient use of the channel, maximizing the throughput by sending different numbers of bits on different subchannels. The number of bits on each subchannel depends on the Signal-to-Noise Ratio of the subchannel. The performance of a DMT system can be further increased by using powerful coding techniques. This thesis in...
متن کاملThe Analysis of Features of Modified Precoding and Coding Techniques Used by the Vdsl Technology
For successfully analyzing the signal protection in the case of VDSL transmission on metallic homogeneous symmetric lines, it is necessary to know the basic features of the VDSL environment and the main properties of the techniques able to eliminate the negative influences on the transmitted signals. This article briefly discusses the proposed coding and precoding techniques and introduces a si...
متن کاملDiscrete Multitone Modulation with Least Squares Inverse Channel Filtering - Personal Wireless Communication, 1999 IEEE International Conference on
ADSL(Asymmetric Digital Subscriber Line) transmission technology meets internet access requirement quite well and offers telephone companies a technology for connecting virtually all internet users at megabit rates.The ANSI (American National Standara Institute) proposes discrete multitone (DMT) modulation with DFT (discrete Fourier tranasform) bases [l] as the carriers for the ADSL system. Rec...
متن کاملThe effect of timing jitter on the performance of a discrete multitone system
The transmission of high-speed data over severely band-limited channels may be accomplished through the use of discrete multitone (DMT) modulation, a modulation technique that has been proposed for a number of new applications. While the performance of a DMT system has been analyzed by a number of authors, these analyses ignore the effect of timing jitter on system performance. Timing jitter be...
متن کاملConcatenated space-time block coding with trellis coded modulation in fading channels
Trellis coded modulation (TCM) is a bandwidth efficient transmission scheme that can achieve high coding gain by integrating coding and modulation. This paper presents an analytical expression for the error event probability of concatenated space–time block coding with TCM which reveals some dominant factors affecting the system performance over slow fading channels when perfect interleavers ar...
متن کامل