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    • 8. 发明授权
    • Enforcing constant modulus and finite alphabet properties in adaptive and dual-stage codebooks
    • 在自适应和双级码本中实现恒定模量和有限的字母表属性
    • US09571173B2
    • 2017-02-14
    • US13210052
    • 2011-08-15
    • Stefan GeirhoferPeter GaalJuan Montojo
    • Stefan GeirhoferPeter GaalJuan Montojo
    • H04B7/02H04B7/04H04B7/06
    • H04B7/0417H04B7/0465H04B7/0478H04B7/0634H04B7/065
    • Methods and apparatus for enforcing codebook properties (e.g., constant modulus and/or finite alphabet) in adaptive and dual-stage codebooks are described. One example method generally includes receiving multiple feedback aspects of a channel for wireless communications determining multiple codewords based on the multiple feedback aspects, determining a final precoding matrix based on the multiple codewords, enforcing at least one codebook property in at least one of the multiple codewords or the final precoding matrix, applying the final precoding matrix to a plurality of spatial streams to form precoded spatial streams, and transmitting the precoded spatial streams. For certain aspects, enforcing the at least one codebook property includes quantizing elements in each of the multiple codewords and/or the final precoding matrix to the nearest value in a finite alphabet or to increase a performance metric.
    • 描述了在自适应和双级码本中强制码本属性(例如恒定模数和/或有限字母表)的方法和装置。 一个示例性方法通常包括接收用于基于多个反馈方面确定多个码字的无线通信的信道的多个反馈方面,基于多个码字确定最终预编码矩阵,在多个码字中的至少一个中实施至少一个码本属性 或最终预编码矩阵,将最终预编码矩阵应用于多个空间流以形成预编码的空间流,以及发送预编码的空间流。 对于某些方面,强制执行至少一个码本属性包括在多个码字和/或最终预编码矩阵中的每个中将元素量化到有限字母表中的最接近的值,或者增加性能度量。