FreeCalypso > hg > gsm-net-reveng
changeset 66:599fac1b882d
pathloss: implement FSL
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Fri, 25 Oct 2024 08:12:28 +0000 |
| parents | b3f04535eb14 |
| children | d8ccdccd8b2b |
| files | pathloss/Makefile pathloss/fsl.c pathloss/main.c pathloss/range_func.h |
| diffstat | 4 files changed, 29 insertions(+), 3 deletions(-) [+] |
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--- a/pathloss/Makefile Fri Oct 25 07:42:53 2024 +0000 +++ b/pathloss/Makefile Fri Oct 25 08:12:28 2024 +0000 @@ -1,12 +1,12 @@ CC= gcc CFLAGS= -O2 PROG= pathloss -OBJS= main.o +OBJS= fsl.o main.o all: ${PROG} ${PROG}: ${OBJS} - ${CC} -o $@ ${OBJS} + ${CC} -o $@ ${OBJS} -lm clean: rm -f *.o ${PROG}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/pathloss/fsl.c Fri Oct 25 08:12:28 2024 +0000 @@ -0,0 +1,16 @@ +/* + * Free Space Loss calculation + */ + +#define _GNU_SOURCE +#include <math.h> +#include "range_func.h" + +#define PI_f ((float) M_PI) + +float rf_range_freespace(float freq_mhz, float path_loss) +{ + float wavelen = 300.0f / freq_mhz; + + return (wavelen / pow10f(path_loss / -20.0f)) / (PI_f * 4.0f); +}
--- a/pathloss/main.c Fri Oct 25 07:42:53 2024 +0000 +++ b/pathloss/main.c Fri Oct 25 08:12:28 2024 +0000 @@ -8,6 +8,7 @@ #include <stdlib.h> #include <string.h> #include <strings.h> +#include "range_func.h" #define MAX_FIELDS 5 static char linebuf[256], *fields[MAX_FIELDS]; @@ -269,6 +270,10 @@ path_loss_ul = ms_power + bts_ant_gain - bts_rxs - misc_loss; printf("Path loss budget: %.2f dB DL, %.2f dB UL\n", path_loss_dl, path_loss_ul); - /* distance calculations will go here */ + /* distance per various models */ + printf("FSL: %.2f m DL, %.2f m UL\n", + rf_range_freespace(freq_dl, path_loss_dl), + rf_range_freespace(freq_ul, path_loss_ul)); + /* Egli and Hata coming next */ exit(0); }