Per Stream Antenna Cyclic Shift Delay for Uplink MIMO
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Solution Overview
Problem
In wireless communication systems, particularly in uplink multi-user MIMO transmissions, unintentional beamforming occurs due to the use of multiple antennas and streams, leading to interference and reduced signal differentiation at the receiving end, which existing technologies fail to adequately address.
Innovation Solution
The implementation of per stream and per antenna cyclic shift delay (CSD) values in wireless communication systems, where CSD values are determined based on the number of antennas and streams used for transmission to avoid unintentional beamforming by ensuring proper channel differentiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antennas and streams are used for transmission, then transmission capacity and diversity are improved, but unintentional beamforming occurs causing interference and reduced signal differentiation
Solution Approach 1:
The patent applies cyclic shift delay (CSD) values to different antennas and streams, changing the temporal parameter of signal transmission. By introducing specific time delays (e.g., 0, 4.69, 9.37, 14.06 microseconds) to different spatial streams, the system modifies transmission parameters to prevent unintentional beamforming while maintaining multiple antenna usage for capacity enhancement.
2Reliability
If multiple antennas and streams are used for transmission, then transmission diversity is improved, but channel differentiation becomes difficult leading to signal interference
Solution Approach 1:
The patent introduces cyclic shift delay parameters to create temporal separation between signals from different antennas and streams. This parameter modification enables the receiving end to differentiate channels by detecting the specific delay patterns, thereby maintaining transmission diversity while improving channel differentiation precision through the unique temporal signatures imposed on each stream.
Data Source
AI summary
A method, an apparatus, and a computer-readable medium for wireless communication are provided. In one aspect, the apparatus may determine whether to transmit a frame with CSDs based on a number of antennas, a number of streams, or both. In another aspect, the apparatus may determine a first set of CSD values for transmitting a first set of information associated with a first portion of the frame. In a further aspect, the apparatus may determine a second set of CSD values for transmitting a second set of information associated with a second portion of the frame. In yet another aspect, the apparatus may transmit the first set of information based on the first set of CSD values and the second set of information based on the second set of CSD values using the number of antennas, the number of streams, or both.