Abstract
The transmitter generates a low rate signal and transmits it to the target receiver. Upon receipt of the low rate signal, the target receiver generates and transmits a channel sounding response (CSR). CSR is a short burst that carries certain information, with a predefined transmission format. The transmitter then analyzes the CSR, determines an uplink channel response to estimate the downlink channel response, and determines an appropriate transmission parameter setting based on this analysis and the downlink channel response estimate. The adjustment of the transmission parameters may be performed in either a MAC (Medium Access Control) layer or a PHY (physical) layer, or in a combination of two layers. The transmitter adjusts the transmission parameters and modulates the user data on the subcarriers according to the determined transmission parameter setting, and then transmits the user data to the receiver through the desired bandwidth portion. In a preferred embodiment, the transmitter generates a transmit format control (TFC) signal including the determined transmission parameter setting, including subcarrier modulation information, and transmits it to the receiver.
Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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4G | 18/09/2008 | ISLD-200901-001 | INTERDIGITAL INC |
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5G | 21/12/2017 | ISLD-201711-005 | INTERDIGITAL INC |
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Specification Information
Specification Information
Technologies
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Technologies
Multiple-Input Multiple-Output(MIMO)/Massive MIMO
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