Communication system using a multi-antenna transmit precoder codebook

摘要

Systems using a transmit precoder codebook designed for a four-transmitter (4Tx) antenna configuration are described. The 4Tx antenna configuration is an attractive option for base stations in cellular network environments due to site-acquiring advantages and robust performance. In an embodiment, the transmit precoder codebook can be used for a variety of transmit antenna configurations and has a high resolution to enable beamforming and/or nulling. In another embodiment, the transmit precoder codebook is a two-component codebook, with a first precoder component signaled at a first frequency and a second precoder component signaled at a second higher frequency.

主权项

1. A communication device, comprising:
a channel estimation module configured to generate a channel estimate of a channel from another communication device: a processor configured to determine a four-transmitter (4Tx) precoder from a codebook based on the channel estimate, wherein the 4Tx precoder includes a first precoder component and a second precoder component; and a transmitter configured to signal the first precoder component and the second precoder component to the another communication device; wherein the processor is further configured to select an index for the first precoder component, wherein the transmitter is configured to signal the index to the another communication device, wherein the index indicates a plurality of 4Tx precoders from a finite set of consecutive uniformly spaced 4Tx precoders, and wherein the plurality of 4Tx precoders are non-consecutive within the finite set of consecutive uniformly spaced 4Tx precoders.