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Multi-User MIMO-SDMA for Finite Rate Feedback Systems
Multi-User MIMO-SDMA for Finite Rate Feedback Systems
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机译:用于有限速率反馈系统的多用户MIMO-SDMA
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摘要
A multi-user MIMO downlink beamforming system with limited feedback (200) is provided to enable precoding for multi-stream transmission, where a channel codeword (ui) and one or more channel quality indicator values (CQIA, CQIB) are computed at the user equipment (201.i) on the basis of maximizing a predetermined SINR performance metric (ρi) which estimates the receive signal-to-noise-ratio (SINR) at the user equipment (201.i). The computed codeword (ui) and CQI values (or differential values related thereto) are quantized and fed back to help the base station (210) which applies a correction to the appropriate CQI value in the course of designing the transmit beamforming vectors w and determining the appropriate modulation and coding level to be used for downlink data transmission.
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机译:提供了一种具有有限反馈( 200 B>)的多用户MIMO下行链路波束成形系统,用于启用多流传输的预编码,其中信道码字(u i Sub>)和一个或多个在用户设备( 201。 B> i I>)上计算出更多的信道质量指示符值(CQI A Sub>,CQI B Sub>) ),以最大化预定SINR性能指标(ρ i Sub>)为基础,该指标可估计用户设备( 201)的接收信噪比(SINR)。 B> i I>)。计算出的码字(u i Sub>)和CQI值(或与之相关的差分值)被量化并反馈给基站( 210 B>),以帮助对基站进行校正。在设计发射波束成形矢量w并确定要用于下行链路数据传输的适当调制和编码级别的过程中,使用适当的CQI值。
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