Abstract
The data optimized communication system of the present invention supports legacy access terminals, such as access terminals operating under the 1xEV-DO standard. The system also supports MIMO communication with multi-input / multi-output (MIMO) compatible access terminals. Multiple MIMO spatial signatures are predefined or negotiated. The MIMO rank and the identifier of the spatial signature determined at the MIMO access terminal are transmitted on the I-branch and Q-branch of the existing 1xEV-DO structure. In one embodiment, a 1-bit rank and a 3-bit spatial signature are transmitted over the I-branch as a 4-bit symbol instead of a data rate control (DRC) channel. In another embodiment, a 4-bit spatial signature is transmitted over the I-branch instead of the DRC channel. A 2-bit rank is transmitted over the Q-branch with a 4-bit DRC channel. The 2-bit rank and DRC channel can be identified because they are transmitted using different orthogonal codeword Walsh covers. (Selection) Figure 3
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| Declaration Date | Declaration Reference | Declaring Company | Specification Number | ||||||
| 5G | 12/09/2019 | ISLD-201912-009 | QUALCOMM INC |
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