WIP: OFDM 500Hz
This mode is a work in progress ( WIP ).
Use case: low snr, low speed
| Parameter | Value | Comments |
|---|---|---|
| ns (Number of Symbols) | 5 | |
| np (Pilots per frame) | 32 | |
| tcp (Cyclic Prefix) | 0.006 | |
| ts (Symbol Duration) | 0.016 | |
| rs (Symbol Rate) | 62.5 | |
| nc (Number of Carriers) | 8 | |
| nuwbits (Unique Word Bits) | 54 | |
| timing_mx_thresh | 0.10 | |
| bad_uw_errors | 18 | |
| amp_est_mode | 0 | |
| amp_scale | 290E3 | |
| codename | H_1024_2048_4f | |
| clip_gain1 | 2.8 | |
| clip_gain2 | 0.9 | |
| tx_uw (Transmit Unique Word) | [0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1] |
Nc=8 Ts=0.016 Tcp=0.006 Ns: 5 Np: 32
Nsymperframe: 40 Nbitsperpacket: 2048 Nsamperframe: 880 Ntxtbits: 0 Nuwbits: 54 Nuwframes: 4
uncoded bits/s: 581.8 Duration (incl post/preamble): 3.74 s
ldpc_data_bits_per_frame = 1024
ldpc_coded_bits_per_frame = 2048
ldpc_parity_bits_per_frame = 1024
Nbitsperpacket = 2048
totalbitsperframe = 2048
SNR3kdB: 0.00 Burst offset: -1.86 SNRdB_setpoint: -1.86
Npackets: 1 Nbursts: 1 2.800000 0.900000
Peak: 16384.00 RMS: 9873.13 CPAPR: 4.40 clipped: 28.89%
foff: 0.0 Hz SNR(3k): -1.9 dB measSNR3k: -1.91 dB N: 121.01 dBofdm_ldpc_tx("test_datac.raw",'ofdm500',1,0,'mpp','bursts',100);ofdm_ldpc_rx("test_datac.raw",'ofdm500','packetsperburst',1)
PER @ 0dB MPP with Clipping
Raw BER..: 0.1051 Tbits: 186368 Terrs: 19584 SNR3k: -1.82
Coded BER: 0.0135 Tbits: 88270 Terrs: 1189
Coded PER: 0.0879 Pckts: 91 Perrs: 8 Npre: 68 Npost: 23