Proposed Correction of LDPC Tone Mapping Equation

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Presentation transcript:

Proposed Correction of LDPC Tone Mapping Equation Month Year doc.: IEEE 802.11-yy/xxxxr0 Proposed Correction of LDPC Tone Mapping Equation Date: 2011-03-14 Authors: Slide 1 Hossein Taghavi et al. John Doe, Some Company

Summary We propose a correction to equation 22-65 (page 126, line 51) of D0.1 [1], involving LDPC tone mapping Hossein Taghavi et al.

Review of LDPC Tone Mapping LDPC tone mapping (D0.1, Subclause 22.3.11.8.2 [1]) was proposed in IEEE 801.11-10/1300r0 [2] and approved by the TG In higher rates of 11ac, the length of the LDPC codeword (LCW) can be significantly smaller than the number of bits in an OFDM symbol (NCBPS) Without the LDPC tone mapping, the coded bits from each LDPC codeword are transmitted only through a fraction of the tones, thus not achieving the full frequency diversity LDPC tone mapping provides full frequency diversity without the extra delay of interleaving For LDPC-coded streams, maps consecutive QAM symbols to data tones which are separated by at least DTM -1 other data tones With LDPC tone mapping Here DTM=3 Hossein Taghavi et al.

Proposed Correction In Subclause 22.3.11.8.2, the equation LDPC Tone Mapper In Subclause 22.3.11.8.2, the equation defines the mapping of the k’th QAM symbol of an LDPC-coded stream in each OFDM symbol to data tone t(k) For example, at 20MHz (DTM = 4), QAM symbols with indices k = 0, 1, 2, 3, … are mapped to data tones t(k) = 0, 4, 8, 12,... In other words, the input QAM symbol should become to the output QAM symbol , which is transmitted on data tone t(k) The first paragraph of page 127 explains this process accurately However, there is an error in Eq. 22-65 since it does the reverse: It maps QAM symbol t(k) to data tone k. Eq. 22-65 should be corrected to Hossein Taghavi et al.

Premotion Do you agree with changing equation 22-65 (page 126, line 51) of D0.1 [1], involving LDPC tone mapping, from to Approved with no objection. Hossein Taghavi et al.

Reference [1] IEEE P802.11ac/D0.1 [2] “11-10-1300-00-00ac-ldpc-for-11ac”, Jun Zheng et al. Hossein Taghavi et al.