Dual polarity coding system and method for a millimeter wave communication system
A method and system for efficient dual polarity transmission of a millimeter wave data stream of overall rate R fixed +R var +R MAC through two channels of polarities H and V. The method comprises the steps of determining asymmetric H and V transmission powers such that the overall rate R fixed +R var +R MAC is maximized, determining asymmetric η H and η V spectral efficiencies according to the asymmetric H and V transmission powers, and determining asymmetric coding and interleaving parameters related to the asymmetric η H and η V spectral efficiencies.
1. A method for efficient dual polarity transmission of a millimeter wave data stream of overall rate R fixed +R var +R MAC through two channels of polarities H and V, comprising the steps of:
a. determining asymmetric H and V transmission powers such that the overall rate R fixed +R var +R MAC is maximized, and
b. determining asymmetric η H and η V spectral efficiencies according to said asymmetric H and V transmission powers.
2. The method of claim 1 further comprising determining asymmetric coding and interleaving parameters related to said asymmetric η H and η V spectral efficiencies.
3. The method of claim 1 , wherein said step of determining asymmetric η H and η V spectral efficiencies includes allocating partial spectral efficiencies η 1 to η 6 between said η H and η V spectral efficiencies to achieve a maximal effective interleaver depth, said partial spectral efficiencies used in said interleaving.
4. The method of claim 1 , wherein said step of determining asymmetric H and V transmission powers includes setting said respective powers based on the determination of mean square error data of each of the H and V channels at a respective H and V input trellis decoder, after conventional filtering and equalization.
5. The method of claim 3 , wherein said step of allocating is preceded by the step of calculating said partial spectral efficiencies η 1 to N 6 according to
η 5 =Q (η MAC /2)
η 6 =η MAC −η 5
η
1
=
Q
(
η
fixed
/
2
)
if
η
H
-
η
5
>
Q
(
η
fixed
/
2
)
,
=
η
H
-
η
5
otherwise
.
η 2 =η fixed −η 1
η 3 =max[0,η H −(η 1 +η 5 )]
η 4 =η V −(η 2 +η 6 )
where Q is a given quantization function.
6. The method of claim 5 , wherein said step of allocating includes allocating said partial spectral efficiencies according to
η H =η 1 +η 3 +η 5
η V =η 2 +η 4 +η 6 .
7. The method of claim 2 , wherein said step of determining asymmetric coding and interleaving parameters further includes structuring a fixed interleaver and a variable interleaver, and mapping respective interleaver symbols.
8. The method of claim 7 , wherein said structuring includes structuring said fixed interleaver to have a fixed interleaver number of rows of at least k*η fixed , and structuring said variable interleaver to have a variable interleaver number of rows of at least k*η var where k is a machine dependent constant.
9. The method of claim 7 , wherein said mapping of respective interleaver symbols includes mapping each symbol in said H steam comprised of η H bits to include on average η 1 bits from said R fixed , η 3 bits from said R var and η 5 bits from said R MAC , and mapping each symbol in said V stream comprised of η V bits to include on average η 2 bits from said R fixed , η 4 bits of said R var and η 6 bits of said R MAC .
10. The method of claim 2 , wherein said coding includes coding according to a Reed Solomon (RS) code.
11. The method of claim 10 , wherein said RS code is an RS(255, 255−2t_fixed) block code, wherein said constructing of said interleaver rows includes distributing RS(255, 255−2t_fixed) block code symbols inside a codeword such that said fixed interleaver includes 255*η 1 /(η 1 +η 2 ) symbols from the H data, and 255*η 2 /(η 1 +η 2 ) symbols from the V data, and wherein said variable interleaver includes 255*η 3 /(η 3 +η 4 ) symbols from the H data, and 255*η 4 /(η 3 +η 4 ) symbols from the V data.
12. A system for efficient dual polarity transmission of a millimeter wave data stream of overall rate R fixed +R var +R MAC through two channels of polarities H and V, comprising:
a. at least one block coder operative to produce an outer RS(255, 255−2t_fixed) Reed Solomon block code:
b. at least one trellis coder operative to produce an inner trellis code:
c. at least one interleaver connected to said block coder and operative to spread error bursts in channel symbols introduced by said at least one trellis coder among blocks of said Reed Solomon block code, wherein said at least one interleaver includes a fixed interleaver for a stream R fixed , and a variable interleaver for a steam R var , wherein said fixed interleaver is structured to have a fixed interleaver number of rows of at least k*η fixed , that include 255*η 1 /(η 1 +η 2 ) symbols from the H data, and 255*η 2 /(η 1 +η 2 ) symbols from the V data, and wherein said variable interleaver is structured to have a variable interleaver number of rows of at least k*η var that include 255*η 3 /(η 3 +η 4 ) symbols from the H data, and 255*η 4 /(η 3 +η 4 ) symbols from the V data, where k is a machine dependent constant; and
d. mapping means to achieve a maximal effective interleaver depth in said interleaver, wherein said mapping means include means to map bits to channel symbols separately for the H and V channels, whereby each said H symbol includes η H bits that include on average η 1 bits from said R fixed , η 3 bits from said R var and η 5 bits from said R MAC , and whereby each said V symbol includes η V bits that include on average η 2 bits from said R fixed , η 4 bits of said R var and η 6 bits of said R MAC .