[STDS-802-16] Questioin about mapping bits among CC, interleaving, repitition, modulation

["Liew, William" <William.Liew@ANDREW.COM>]

The mapping among CC, interleaving, repetition and modulation in 802.16-2004/2005 is quite confusing:

 

(1)     For Section 8.4.9.2.1 about CC, is the author assuming that the output order is

……y[2]x[2] y[1]x[1] y[0]x[0]àout first

????

(2)     For Section 8.4.9.3 about interleaving, is the author assuming that the bits from 8.4.9.2.1 be re-indexed as

……y[2]x[2] y[1]x[1] y[0]x[0]= ……c[5]c[4] c[3]c[2] c[1]c[0] àout first

Then apply the stated formulas????

Now assuming the output of Section 8.4.9.3 is ……a[5]a[4] a[3]a[2] a[1]a[0] àout first

(3)     For Section 8.4.9.3 about repetition, is the author assuming the bits ……a[5]a[4] a[3]a[2] a[1]a[0] from Section 8.4.9.3

should be arranged as (assuming 24-carriers (1-subchannel, 2-cluster) X 2-symbols slot, QPSK)

…… a[47]…… a[0] àout first        (1^st symbol)

…… a[95]…… a[48]       (2^nd symbol)

Or

…… a[94]……a[2] a[0] àout first        (1^st symbol)

…… a[95]……a[3] a[1]       (2^nd symbol)

????

(4)     For Section 8.4.9.4.2 (modulation), is the author assuming bits from the previous block should be ordered as (using the previous example)   

…… b[47]…… b[1]   b[0] àout first        (1^st symbol)

…… b[95]…… b[48] b[48]       (2^nd symbol)

Then each pair (e.g., QPSK) of b[1] b[0] or b[3] b[2] …… are mapped according to Figure 263???? (The word MSB is too vague!)

 

 

Please clarify those confusions in the standard, thank you in advance for your kind help.

 

 

Dr. Will Liew

Andrew Corp.

434-386-5212

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