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Integrated LT Coding, Bit Interleaved Differential Space Time Coding and Sphere Packing Modulation for the Wireless Internet

机译:无线互联网的集成LT编码,比特交织差分空时编码和球形包装调制

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摘要

In this treatise, a jointly optimized Bit Interleaved Coded Modulation using Iterative Decoding (BICM-ID) and Luby Transform (LT) coding scheme was proposed for the sake of attaining the best possible performance, when communicating over the wireless Internet. This scheme is particularly attractive when handling packetized wireless Internet data traffic received over wireless channels inflicting both statistically multiplexing induced packet erasure and packet corruption imposed by the channel without retransmitting the corrupted packets. A LLR-based estimation packet reliability algorithm was proposed to assist the LT decoder in recovering all the transmitted packets. Furthermore, the bit-to-sphere-packing symbol mapping scheme was optimized for achieving error free LT decoding at the lowest possible Eb/N0 value rather than for approaching the channel’s capacity. These two design philosophies require different mapping schemes. Finally, Differential Space Time Coding (DSTBC) was employed for combatting the effects of fading and provided spatial diversity at the same time. The LT code’s packet length was also carefully chosen to strike a good balance between the affordable complexity and the achievable performance.
机译:在本论文中,为了在无线互联网上进行通信时获得最佳性能,提出了一种使用迭代解码(BICM-ID)和卢比变换(LT)编码方案的联合优化的比特交错编码调制。当处理通过无线信道接收到的分组化无线Internet数据流量时,这种方法会引起统计上的多路复用引起的数据包擦除和该信道施加的数据包损坏,而又不重新传输损坏的数据包,则该方案特别有吸引力。提出了一种基于LLR的估计分组可靠性算法,以帮助LT解码器恢复所有传输的分组。此外,位到球封装符号映射方案经过优化,可在尽可能低的Eb / N0值下实现无差错LT解码,而不是接近信道容量。这两种设计理念需要不同的映射方案。最后,采用差分时空编码(DSTBC)来消除衰落的影响并同时提供空间分集。还仔细选择了LT代码的数据包长度,以在可承受的复杂性和可实现的性能之间取得良好的平衡。

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