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IEEE802dot11a >
Interleaver, 802.11a (INTLV11A)

Interleaver, 802.11a (INTLV11A)

Property	Description	Units	Default	Range/Type
MODULATION	Modulation type	None	0	[0, 3]/Integer
RIN	Input impedance	Ohm	Inf	(0, Inf]/Real
ROUT	Output impedance	Ohm	0	[0, Inf)/Real
Ports
Input	Bits before interleaving (integer)
Output	Bits after interleaving (integer)

Limits

Notes

1. This model can be used for encoded data interleaving, according to IEEE 802.11a standard.

2. All encoded data bits shall be interleaved by a block interleaver with a block size corresponding to the number of bits in a single OFDM symbol, N_CBPS. The interleaver is defined by a two-step permutation. The first permutation ensures that adjacent coded bits are mapped onto nonadjacent subcarriers. The second ensures that adjacent coded bits are mapped alternately onto less and more significant bits of the constellation and, thereby, long runs of low reliability (LSB) bits are avoided.

3. We shall denote by k the index of the coded bit before the first permutation; i, shall be the index after the first and before the second permutation, and J shall be the index after the second permutation, just prior to modulation mapping. The first permutation is defined by the rule

(1)
where the function floor (.) denotes the largest integer not exceeding the parameter. The second permutation is defined by the rule

(2)
where the value of s is determined by the number of coded bits per subcarrier, N_BPSC , according to

(3)
In the above equations, N_CBPS and N_BPSC depend on the base modulation mode, as shown in the following Table (IEEE 802.11a Rate-dependent parameter).

Data rate (Mbits/s)	Modulation	Coding rate (R)	Coding bits per subcarrier (N_BPSC)	Coding bits per OFDM symbol (N_CBPS)	Data bits per OFDM symbol (N_DBPS)
6	BPSK	1/2	1	48	24
9	BPSK	3/4	1	48	36
12	QPSK	1/2	2	96	48
18	QPSK	3/4	2	96	72
24	16-QAM	1/2	4	192	96
36	16-QAM	3/4	4	192	144
48	64-QAM	2/3	6	288	192
54	64-QAM	3/4	6	288	216

Netlist Form

INTLV11A:NAME n1 n2 [MODULATION =val] [RIN=val] [ROUT=val]

Netlist Example

INTLV11A:1 1 2 MODULATION = 2

References

1. [1] IEEE Std 802.11a, Part 11: “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: High-speed Physical Layer in the 5 GHz Band,” ISO/IEC 8802-11:1999/Amd 1:2000(E).

2. [2]J. Terry and J. Heiskala, Proakis, OFDM Wireless LANs: A Theoretical and Practical Guide, Sams Publishing, 2002.

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