Cisco Technology, Inc.

Audrey Yazdanparast

Brian Donald Hart

Matthew Aaron Silverman

Ardalan Alizadeh

Mohsen Jamalabdollahi

Signal to Interference and Noise Ratio (SINR) estimation, and more specifically providing SINR estimation during Legacy Long Training Field (LLTF) accounting for Inter Symbol Interference (ISI) may be provided. SINR estimation may include receiving a Physical Layer Protocol Data Unit (PPDU) including a LLTF and extracting groups of transmission symbols from the LLTF. Next, groups of fragmented symbols may the groups of transmission symbols. One or more Sum of the Squared Magnitudes (SSM) may be determined, such as an SSM of the total signal, an SSM of the signal without ISI and/or noise, an SSM of ISI, an SSM of noise. Finally, SINR may be estimated using one or more SSMs (e.g., the SSM of noise, the SSM of signal, and the SSM of ISI).

Signal to interference and noise ratio estimation

Legacy preamble puncturing for fine timing and frequency offset estimation may be provided. Within a user information field of a trigger frame, a legacy preamble puncturing pattern may be allocated to each of a plurality of client devices wherein each of the plurality of client devices is allocated with at least one respective corresponding non-overlapping sub-channel. Next, from each of the plurality of client devices on their respective corresponding non-overlapping sub-channel, a respective corresponding preamble may be received. Time and frequency synchronization may then be performed for each of the plurality of client devices based on their respective corresponding preamble.

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Richfield, OH, United States of America

Audrey Yazdanparast