1 /*
2 * Copyright 2018 Oticon A/S
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6 #include "bs_types.h"
7 #include "p2G4_pending_tx_rx_list.h"
8 #include "channel_NtNcable_args.h"
9 #include "channel_if.h"
10
11 static uint n_devices;
12 static ch_NtN_args_t args;
13
14 /**
15 * Initialize the channel
16 */
channel_init(int argc,char * argv[],uint n_devs)17 int channel_init(int argc, char *argv[], uint n_devs){
18 n_devices = n_devs;
19
20 channel_NtNcable_argparse(argc, argv, &args);
21 return 0;
22 }
23
24 /**
25 * Recalculate the fading and path loss of the channel in this current moment (<now>)
26 * in between the N used paths and the receive path (<rxnbr>)
27 *
28 * inputs:
29 * tx_used : array with n_devs elements, 0: that tx is not transmitting,
30 * 1: that tx is transmitting,
31 * e.g. {0,1,1,0}: devices 1 and 2 are transmitting, device 0 and 3 are not.
32 * tx_list : array with all transmissions status (the channel can check here the modulation type of the transmitter if necessary)
33 * (ignored in this channel)
34 * txnbr : desired transmitter number (the channel will calculate the ISI only for the desired transmitter)
35 * (ignored in this channel)
36 * rxnbr : device number which is receiving
37 * (ignored in this channel)
38 * now : current time
39 * (ignored in this channel)
40 * att : array with n_devs elements. The channel will overwrite the element i
41 * with the average attenuation from path i to rxnbr (in dBs)
42 * The caller allocates this array
43 * ISI_SNR : The channel will return here an estimate of the SNR limit due to multipath
44 * caused ISI for the desired transmitter (in dBs)
45 * (This channel sets this value always to 100.0)
46 *
47 * Returns < 0 on error.
48 * 0 otherwise
49 */
channel_calc(const uint * tx_used,tx_el_t * tx_list,uint txnbr,uint rxnbr,bs_time_t now,double * att,double * ISI_SNR)50 int channel_calc(const uint *tx_used, tx_el_t *tx_list, uint txnbr, uint rxnbr, bs_time_t now, double *att, double *ISI_SNR){
51 uint i;
52 for ( i = 0 ; i < n_devices; i++ ){
53 att[i] = args.attenuation;
54 }
55 *ISI_SNR = 100;
56
57 return 0;
58 }
59
60 /**
61 * Clean up: Free the memory the channel may have allocate
62 * close any file descriptors etc.
63 * (the simulation has ended)
64 */
channel_delete()65 void channel_delete(){
66
67 }
68
