TCH9 channel coding

Files
file	tch9.h
	Osmocom GMR-1 TCH9 channel coding header.
file	tch9.c
	Osmocom GMR-1 TCH9 channel coding implementation.

Enumerations
enum	gmr1_tch9_mode { GMR1_TCH9_2k4 , GMR1_TCH9_4k8 , GMR1_TCH9_9k6 , GMR1_TCH9_MAX }
	TCH9 possible data rates. More...

Functions
void	gmr1_tch9_encode (ubit_t *bits_e, const uint8_t *l2, enum gmr1_tch9_mode mode, const ubit_t *bits_sacch, const ubit_t *bits_status, const ubit_t *ciph, struct gmr1_interleaver *il)
	GMR-1 TCH9 channel coder. More...
void	gmr1_tch9_decode (uint8_t *l2, sbit_t *bits_sacch, sbit_t *bits_status, const sbit_t *bits_e, enum gmr1_tch9_mode mode, const ubit_t *ciph, struct gmr1_interleaver *il, int *conv_rv)
	GMR-1 TCH9 channel decoder. More...

Detailed Description

Enumeration Type Documentation

gmr1_tch9_mode

enum gmr1_tch9_mode

TCH9 possible data rates.

Enumerator
GMR1_TCH9_2k4	TCH9 with 2.4k data rate.
GMR1_TCH9_4k8	TCH9 with 4.8k data rate.
GMR1_TCH9_9k6	TCH9 with 9.6k data rate.
GMR1_TCH9_MAX	Dummy value.

Function Documentation

gmr1_tch9_decode()

void gmr1_tch9_decode	(	uint8_t *	l2,
		sbit_t *	bits_sacch,
		sbit_t *	bits_status,
		const sbit_t *	bits_e,
		enum gmr1_tch9_mode	mode,
		const ubit_t *	ciph,
		struct gmr1_interleaver *	il,
		int *	conv_rv
	)

GMR-1 TCH9 channel decoder.

Parameters

[out]	l2	L2 packet data
[out]	bits_sacch	10 saach bits demultiplexed
[out]	bits_status	4 status bits demultiplexed
[in]	bits_e	662 encoded bits of one NT9 burst
[in]	mode	Channel encoding mode
[in]	ciph	658 bits of cipher stream (can be NULL)
[in,out]	il	Inter-burst interleaver state
[out]	conv_rv	Return of the convolutional decode (can be NULL)

L2 data size depends on the mode (18 bytes for 2k4, 30 bytes for 4k8, 60 bytes for 9k6).

gmr1_tch9_encode()

void gmr1_tch9_encode	(	ubit_t *	bits_e,
		const uint8_t *	l2,
		enum gmr1_tch9_mode	mode,
		const ubit_t *	bits_sacch,
		const ubit_t *	bits_status,
		const ubit_t *	ciph,
		struct gmr1_interleaver *	il
	)

GMR-1 TCH9 channel coder.

Parameters

[out]	bits_e	662 encoded bits of one NT9 burst
[in]	l2	L2 packet data
[in]	mode	Channel encoding mode
[in]	bits_sacch	10 saach bits to be multiplexed
[in]	bits_status	4 status bits to be multiplexed
[in]	ciph	658 bits of cipher stream (can be NULL)
[in,out]	il	Inter-burst interleaver state

L2 data size depends on the mode (18 bytes for 2k4, 30 bytes for 4k8, 60 bytes for 9k6).