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首页> 外文会议>Annual Allerton Conference on Communication, Control, and Computing; 20040929-1001; Monticello,IL(US) >An Efficient Signaling Method over MIMO Broadcast Channels
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An Efficient Signaling Method over MIMO Broadcast Channels

机译：MIMO广播信道上的高效信令方法

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摘要

A simple signaling method for multi-antenna broadcast channel is proposed. In the proposed method, for each user, a direction in which that user has the maximum gain is determined. The base station selects the best user in terms of the larger maximum gain, and allocates the corresponding direction to that user. In each step, the maximization is performed in the null space of the former selected coordinates. Finally, the transmitted signal is a superposition of the selected coordinates. It is shown that in this method, the later selected user has no interference on the former users. A dirty paper pre-coding on top of the system eliminates the remaining interferences. Note that, in this method, the set of active users and the power allocated to each of them is easily determined, which is a significant advantage in the case of large number of users in the system. Furthermore, this method exploits multiuser diversity. Further, the proposed algorithm is modified to work with partial side information at the base station. Simulations show that the achieved rate is close to the sum-rate capacity. In addition, the asymptotic analysis shows that the increase of Che sum-rate with number of transmit antenna is linear and with the number of users, K, is proportional to log log(K).
机译：提出了一种简单的多天线广播信道信令方法。在提出的方法中，对于每个用户，确定该用户具有最大增益的方向。基站根据较大的最大增益来选择最佳用户，并将相应的方向分配给该用户。在每个步骤中，在先前选择的坐标的零空间中执行最大化。最后，发送的信号是所选坐标的叠加。结果表明，采用这种方法，后选用户对前用户没有干扰。系统顶部的脏纸预编码消除了残留的干扰。注意，在该方法中，容易确定活动用户的集合以及分配给每个活动用户的功率，这在系统中用户数量众多的情况下是一个显着的优势。此外，该方法利用了多用户多样性。此外，所提出的算法被修改以与基站处的部分辅助信息一起工作。仿真表明，所达到的速率接近于总速率容量。另外，渐近分析表明，Che求和率随发射天线数量的增加是线性的，并且随着用户数量K的增加，与log log（K）成正比。

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