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multiple quadrature amplitude modulation
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     A rate-distortion optimized wireless video streaming algorithm was developed which considers the allocation of multiple quadrature amplitude modulation(M-QAM) sub-channels,the number of scalable video layers,and the channel coding protection priorities for various layers.
     在满足信道传输速率的约束条件下,给出了率失真意义下联合优化多进制正交调幅子信道分配、可伸缩视频编码的传输层数以及各层的信道编码保护级别的视频传输算法。
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     EULER-MACLAURIN QUADRATURE
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The constant modulus algorithm exhibits very slow convergence rates and large remainder error. The convergence rate of error switch algorithm (ESA) is rapid and the error of the steady state is on the small side,however,the switch dot is ambiguity thus resulting in that the algorithm diverge and the remain error is larger. In order to overcome these shortcomings,a new blind equalization algorithm based on the multi-mode error switch is proposed by considering the characteristics of the multiple quadrature...

The constant modulus algorithm exhibits very slow convergence rates and large remainder error. The convergence rate of error switch algorithm (ESA) is rapid and the error of the steady state is on the small side,however,the switch dot is ambiguity thus resulting in that the algorithm diverge and the remain error is larger. In order to overcome these shortcomings,a new blind equalization algorithm based on the multi-mode error switch is proposed by considering the characteristics of the multiple quadrature amplitude modulation (MQAM) signals lied on several circles with known radius. Simulation results demonstrate fast convergence,less remainder error and satisfactory performance by using the algorithm.

为了克服传统常模量算法 ( Constant module algorithm,CMA) [1 ]和基于误差切换的盲均衡算法 ( Errorswitch algorithm,ESA) [2 ] 的缺点 ,本文利用 MQAM( Multiple quadrature amplitude modulation)信号的分布特点 ,给出了适于数字通信系统的一种新的基于多模误差切换的盲均衡算法。理论分析和计算机仿真结果表明 ,新算法误差函数切换点明确 ,减小了计算量和剩余误差 ,收敛性能也令人满意。

To combine low-density parity-check (LDPC) codes wit h space-time block codes (STBC), a scheme for belief propagation space time coded modulation with iterative decoding (BPSTCM-ID) is proposed. The pair error pro bability performance in quasi-stationary fading MIMO channel and design rules f or multiple quadrature amplitude modulation (MQAM) constellations are also analy zed. Both outer and inner iterations are used to avoid too much error feedback w hich may cause decoding failures. The scheme introduces...

To combine low-density parity-check (LDPC) codes wit h space-time block codes (STBC), a scheme for belief propagation space time coded modulation with iterative decoding (BPSTCM-ID) is proposed. The pair error pro bability performance in quasi-stationary fading MIMO channel and design rules f or multiple quadrature amplitude modulation (MQAM) constellations are also analy zed. Both outer and inner iterations are used to avoid too much error feedback w hich may cause decoding failures. The scheme introduces check equations of LDPC codes to terminate both iterations, thus reducing the average decoding complexit ies. Simulation results show that the BPSTCM-ID is effective and its performanc e is better than that of the other three schemes.

提出一种结合低密度校验码和空时分组码的置信传播编码调制方案 ,并对其在准静态 MIMO衰落信道下成对差错概率及最优星座选择进行了分析 ,并给出了相应的参考设计准则。为防止过多错误反馈造成译码失效 ,提出采用内、外双重迭代方式提高系统的鲁棒性。同时 ,由于该方案把 LDPC(Low-density parity-check)码校验矩阵作为迭代终止判决准则 ,使得迭代算法的平均复杂度降低。

Scalable video coding has the ability to transmit partial bit streams which can be used to reconstruct lower quality video according to the channel status to adapt to channel quality fluctuations.A rate-distortion optimized wireless video streaming algorithm was developed which considers the allocation of multiple quadrature amplitude modulation(M-QAM) sub-channels,the number of scalable video layers,and the channel coding protection priorities for various layers.Comparisons with the equal error protection(EEP)...

Scalable video coding has the ability to transmit partial bit streams which can be used to reconstruct lower quality video according to the channel status to adapt to channel quality fluctuations.A rate-distortion optimized wireless video streaming algorithm was developed which considers the allocation of multiple quadrature amplitude modulation(M-QAM) sub-channels,the number of scalable video layers,and the channel coding protection priorities for various layers.Comparisons with the equal error protection(EEP) without consideration of prioritized sub-channels show that the algorithm provides 1.5-2 dB gain with robust video streaming over wireless channels.

可伸缩视频编码可以根据信道波动的情况传输部分码流获取较低的视频质量以适应无线信道的波动。在满足信道传输速率的约束条件下,给出了率失真意义下联合优化多进制正交调幅子信道分配、可伸缩视频编码的传输层数以及各层的信道编码保护级别的视频传输算法。实验结果表明,在加性高斯白噪声信道下,与等重保护且不考虑多进制正交调幅子信道差异的机制相比,该传输方案能够取得平均1.5~2 dB的解码增益,显著提高了可伸缩视频码流无线传输的鲁棒性。

 
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