公开(公告)号：US08112095B2

公开(公告)日：2012-02-07

申请号：US12111152

申请日：2008-04-28

申请人： Alexander M. Haimovich ,  Osvaldo Simeone ,  Bo Niu ,  Oren S. Somekh

发明人： Alexander M. Haimovich ,  Osvaldo Simeone ,  Bo Niu ,  Oren S. Somekh

IPC分类号： H04W72/00

CPC分类号： H04L1/0029 ,  H04L1/0026

摘要： A single-input single-output (SISO) downlink channel with K users is analyzed in the presence of Rayleigh flat fading. A limited channel state information (CSI) feedback scheme is included, where only an outdated 1-bit feedback per user is available at the base station for each fading block. A closed-form expression for the achievable ergodic sum-rate of the 1-bit feedback scheme is presented for any number of users, as a function of the fading temporal correlation coefficient, the threshold of the 1-bit CSI quantizer and the SNR. The sum-rate scales with increasing number of users as log log K, which is the same scaling law achieved by the optimal non-delayed full CSI feedback scheme.

摘要翻译： 在存在瑞利平坦衰落的情况下分析具有K个用户的单输入单输出（SISO）下行链路信道。 包括有限的信道状态信息（CSI）反馈方案，其中每个用户在每个衰落块仅在基站处可用过时的1比特反馈。 根据衰落时间相关系数，1位CSI量化器的阈值和SNR，可以为任意数量的用户提供1位反馈方案的可实现的遍历和速率的闭合表达式。 总和率随着用户数量的增加而增加，作为log log K，这是通过最佳非延迟全CSI反馈方案实现的相同的缩放规律。

公开(公告)号：US20090005028A1

公开(公告)日：2009-01-01

申请号：US12111152

申请日：2008-04-28

申请人： Alexander M. Haimovich ,  Osvaldo Simeone ,  Bo Niu ,  Oren S. Somekh

发明人： Alexander M. Haimovich ,  Osvaldo Simeone ,  Bo Niu ,  Oren S. Somekh

IPC分类号： H04Q7/38

CPC分类号： H04L1/0029 ,  H04L1/0026

摘要： A single-input single-output (SISO) downlink channel with K users is analyzed in the presence of Rayleigh flat fading. A limited channel state information (CSI) feedback scheme is included, where only an outdated 1-bit feedback per user is available at the base station for each fading block. A closed-form expression for the achievable ergodic sum-rate of the 1-bit feedback scheme is presented for any number of users, as a function of the fading temporal correlation coefficient, the threshold of the 1-bit CSI quantizer and the SNR. The sum-rate scales with increasing number of users as log logK, which is the same scaling law achieved by the optimal non-delayed full CSI feedback scheme.

摘要翻译： 在存在瑞利平坦衰落的情况下分析具有K个用户的单输入单输出（SISO）下行链路信道。 包括有限的信道状态信息（CSI）反馈方案，其中每个用户在每个衰落块仅在基站处可用过时的1比特反馈。 根据衰落时间相关系数，1位CSI量化器的阈值和SNR，可以为任意数量的用户提供1位反馈方案的可实现的遍历和速率的闭合表达式。 总和率随着用户数量的增加而变化，如log logK，这是通过最佳非延迟全CSI反馈方案实现的相同的缩放规律。