CCCH (PCH/AGCH) channel coding

Files
file	ccch.h
	Osmocom GMR-1 CCCH (PCH/AGCH) channel coding header.
file	ccch.c
	Osmocom GMR-1 CCCH (PCH/AGCH) channel coding implementation.

Functions
void	gmr1_ccch_encode (ubit_t *bits_e, const uint8_t *l2)
	Stateless GMR-1 CCCH channel coder. More...
int	gmr1_ccch_decode (uint8_t *l2, const sbit_t *bits_e, int *conv_rv)
	Stateless GMR-1 CCCH channel decoder. More...

Detailed Description

Function Documentation

gmr1_ccch_decode()

int gmr1_ccch_decode	(	uint8_t *	l2,
		const sbit_t *	bits_e,
		int *	conv_rv
	)

Stateless GMR-1 CCCH channel decoder.

Parameters

[out]	l2	L2 packet data
[in]	bits_e	Data bits of a burst
[out]	conv_rv	Return of the convolutional decode (can be NULL)

Returns

0 if CRC check pass, any other value for fail.

L2 data is 24 byte long, and bits_e is a 432 soft bit array unmapped from a burst.

References gmr1_deinterleave_intra(), and gmr1_scramble_sbit().

gmr1_ccch_encode()

void gmr1_ccch_encode	(	ubit_t *	bits_e,
		const uint8_t *	l2
	)

Stateless GMR-1 CCCH channel coder.

Parameters

[out]	bits_e	Data bits of a burst
[in]	l2	L2 packet data

L2 data is 24 byte long, and bits_e is a 432 hard bit array to be mapped on a burst.

References gmr1_crc16.