公开(公告)号：US20110228869A1

公开(公告)日：2011-09-22

申请号：US13118921

申请日：2011-05-31

申请人： Maged F. Barsoum ,  Christoper R. Jones

发明人： Maged F. Barsoum ,  Christoper R. Jones

IPC分类号： H04B15/00 ,  H04L23/02 ,  H04L27/10

CPC分类号： H04W24/02 ,  H04B15/00 ,  H04L1/0003 ,  H04L1/0009 ,  H04L27/3405 ,  H04L27/3483

摘要： Communication systems are described that use geometrically shaped constellations that have increased capacity compared to conventional constellations operating within a similar SNR band. In several embodiments, the geometrically shaped is optimized based upon a capacity measure such as parallel decoding capacity or joint capacity. In many embodiments, a capacity optimized geometrically shaped constellation can be used to replace a conventional constellation as part of a firmware upgrade to transmitters and receivers within a communication system. In a number of embodiments, the geometrically shaped constellation is optimized for an Additive White Gaussian Noise channel or a fading channel. In numerous embodiments, the communication uses adaptive rate encoding and the location of points within the geometrically shaped constellation changes as the code rate changes. One embodiment of the invention includes a transmitter configured to transmit signals to a receiver via a communication channel, wherein the transmitter, includes a coder configured to receive user bits and output encoded bits at an expanded output encoded bit rate, a mapper configured to map encoded bits to symbols in a symbol constellation, a modulator configured to generate a signal for transmission via the communication channel using symbols generated by the mapper. In addition, the receiver includes a demodulator configured to demodulate the received signal via the communication channel, a demapper configured to estimate likelihoods from the demodulated signal, a decoder that is configured to estimate decoded bits from the likelihoods generated by the demapper. Furthermore, the symbol constellation is a capacity optimized geometrically spaced symbol constellation that provides a given capacity at a reduced signal-to-noise ratio compared to a signal constellation that maximizes dmin.

摘要翻译： 描述了与在类似SNR频带内操作的常规星座相比，使用具有增加的容量的几何形状星座的通信系统。 在几个实施例中，基于诸如并行解码容量或联合容量的容量测量来优化几何形状。 在许多实施例中，可以使用容量优化的几何形状的星座来代替传统的星座作为固件升级到通信系统内的发射机和接收机的一部分。 在多个实施例中，针对加性高斯白噪声信道或衰落信道对几何形状的星座进行了优化。 在许多实施例中，通信使用自适应速率编码和几何形状星座中的点的位置随着码率的变化而改变。 本发明的一个实施例包括：发射机，被配置为经由通信信道向接收机发送信号，其中所述发射机包括被配置为以扩展的输出编码比特率接收用户比特并输出编码比特的编码器，配置成映射编码的 比特到符号星座中的符号，调制器被配置为生成用于通过通信信道传输的信号，使用由映射器产生的符号。 此外，接收机包括被配置为经由通信信道解调接收信号的解调器，被配置为从解调信号估计似然性的解映射器，被配置为从由解映射器生成的似然值估计解码比特的解码器。 此外，符号星座是容量优化的几何间隔的符号星座，与最大化dmin的信号星座相比，以降低的信噪比提供给定容量。