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Enhancing VHT Control Field for Transmit Diversity Indication in Wireless Communications

This document addresses the limitations of the FB.Tx.Type subfield in the VHT format HT control field, specifically its inability to fully convey the transmission modes during unsolicited MFB frames. It discusses scenarios where unbeamforming is used with or without transmit diversity, emphasizing the need for distinguishing between these modes through enhanced signaling. A proposed solution includes reusing a single bit in the HT control field to indicate STBC (Space-Time Block Coding) transmission, which would improve clarity and utility in communication protocols without altering the existing MSI sequence.

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Enhancing VHT Control Field for Transmit Diversity Indication in Wireless Communications

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  1. Comments Resolution on CID 3749 Date:2011-07-21 Authors: Slide 1

  2. Comment

  3. Discussion • FB Tx Type in VHT format HT Control field: • FB Tx Type subfield is set to 0 to indicate unbeamforming or transmit diversity when this field is in the unsolicited MFB frame • Only FB Tx Type cannot indicate all the possibilities clearly • Further, the transmitter has two choices to transmit the PPDU without beamforming: • Unbeamforming without transmit diversity • Unbeamforming with transmit diversity • There should be difference between SNRs in the MFB field • The transmit diversity gain and receive diversity gain are very large compared to multiplexing

  4. Discussion (Cont) • Scenario: • 2*2 • 1 stream with STBC vs 2 streams (multiplexing) • Channel model: C, Distance: 15m, • BW: 20MHz • MCS: PER<0.1 • SNR-MCS curve:

  5. Proposed Solution • Reuse one bit in VHT format HT control field to indicate STBC: • STBC FB Type: • 0: transmission without STBC • 1: transmission with STBC • Change the definition of FB Tx Type accordingly • Location of the bit is in MSI: • Traditional MSI (3 bits): • Modified MSI format: (still 3 bits) B3 B4 B5 Implementation specific B3 B4 B5 Implementation specific STBC FB Type Note –The bit provides no change to the existing MSI sequence, only add a constraint for the choice of MSI.

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