公开(公告)号：US20040066738A1

公开(公告)日：2004-04-08

申请号：US10664088

申请日：2003-09-17

Applicant: Tioga Technologies, Ltd.

Inventor： Daniel Stopler

IPC: H04J011/00

CPC classification number: H04L1/0057 ,  H04L1/0041 ,  H04L1/006 ,  H04L1/0065 ,  H04L1/0071 ,  H04L27/2602

Abstract: An encoding/framing scheme for multitone modulation over impulsive channels which allows efficient operation in multipoint to point channels which are affected by ingress (narrowband noise) and impulsive (burst) interference. The coding is achieved using a concatenated approach, with the inner code being Trellis Coded Modulation (TCM), using, for example, convolutional coding, and the outer code being a Reed Solomon (RS) code. Two dimensional interleaving is performed, with one dimension being time, and the other dimension being frequency (tones or sub-channels). The TCM coding provided by the present invention is quite effective in dealing with impulse noise effects. The interleaving may be applied in two levels. According to one embodiment, user data is RS encoded, and a portion of the RS encoded data is interleaved and filled along columns for transmission using a multitone transmission system. The remaining portion of the RS encoded user data is then TCM encoded, interleaved and effectively filled along rows for subsequent transmission. In another embodiment, a portion of the user data is RS encoded, interleaved and filled along columns for transmission, while the remaining portion of the user data is instead TCM encoded, interleaved and effectively filled along rows for subsequent transmission. A diagonalization scheme is also used to provide immunity against impulse noise, while at the same time allowing for a simple method of utilizing tones of different loading. According to the diagonalization principle, data packets are spread over time in a diagonal fashion, such that an impulse noise affects more than one user's packets, with the effect on each being reduced. In this way, a code having lower redundancy can be used since the amount of corruption expected in one user's data packet will be reduced.

Abstract translation: 用于在脉冲通道上进行多音调制的编码/成帧方案，其允许在受入射（窄带噪声）和脉冲（突发））干扰影响的多点到多点通道中的有效操作。 使用级联方法实现编码，内部代码是网格编码调制（TCM），使用例如卷积编码，而外部代码是里德所罗门（RS）代码。 执行二维交织，一维是时间，另一维是频率（音调或子通道）。 本发明提供的TCM编码在处理脉冲噪声效应方面是非常有效的。 交错可以应用于两个层次。 根据一个实施例，用户数据被RS编码，并且RS编码数据的一部分被交错并沿着列填充，以便使用多音频传输系统进行传输。 RS编码的用户数据的剩余部分然后被TCM编码，交错和有效地沿着行填充以供后续传输。 在另一个实施例中，用户数据的一部分是沿着列进行RS编码，交织和填充以进行传输，而用户数据的剩余部分被替代地被TCM编码，交错并有效地沿着行填充以用于随后的传输。 对角化方案也用于提供抗脉冲噪声的抗扰性，同时允许使用不同负载色调的简单方法。 根据对角化原理，数据分组以对角线方式随时间扩散，使得脉冲噪声影响多于一个用户的分组，并且每个分组的影响被减小。 以这种方式，可以使用具有较低冗余度的代码，因为在一个用户的数据分组中预期的损坏量将减少。