def generate_reference_frame(timeslots,
subcarriers,
active_subcarriers,
cp_len,
cs_len,
alpha=.2):
p_seed = utils.generate_seed('awesome preamble')
f_seed = utils.generate_seed('awesome frame')
subcarrier_map = mapping.get_subcarrier_map(subcarriers,
active_subcarriers,
dc_free=True)
overlap = 2
frame_preamble, x_preamble = preamble.mapped_preamble(
p_seed, 'rrc', alpha, active_subcarriers, subcarriers, subcarrier_map,
overlap, cp_len, cs_len)
d = utils.get_random_qpsk(timeslots * active_subcarriers, f_seed)
d_frame = mod_frame = gfdm_modulation.modulate_mapped_gfdm_block(
d,
timeslots,
subcarriers,
active_subcarriers,
overlap,
alpha,
dc_free=True)
symbol = cyclic_prefix.add_cyclic_starfix(d_frame, cp_len, cs_len)
window_ramp = cyclic_prefix.get_raised_cosine_ramp(
cs_len,
cyclic_prefix.get_window_len(cp_len, timeslots, subcarriers, cs_len))
d_frame = cyclic_prefix.pinch_block(symbol, window_ramp)
H = filters.get_frequency_domain_filter('rrc', alpha, timeslots,
subcarriers, overlap)
return np.concatenate(
(frame_preamble, d_frame)), mod_frame, x_preamble, d, H
def get_sync_symbol(pn_symbols, H, K, L, cp_len, ramp_len):
M = 2 # fixed for preamble
pn_symbols = np.concatenate((pn_symbols, pn_symbols))
D = get_data_matrix(pn_symbols, K, group_by_subcarrier=True) # careful here! group by subcarrier is correct!
symbol = x_symbol = gfdm_modulate_block(D, H, M, K, L, compat_mode=False)
symbol = add_cyclic_starfix(symbol, cp_len, ramp_len)
window_ramp = get_raised_cosine_ramp(ramp_len, get_window_len(cp_len, M, K, ramp_len))
symbol = pinch_block(symbol, window_ramp)
return symbol, x_symbol
def generate_reference_frame(timeslots, subcarriers, active_subcarriers, cp_len, cs_len, alpha=.2):
p_seed = utils.generate_seed('awesome preamble')
f_seed = utils.generate_seed('awesome frame')
subcarrier_map = mapping.get_subcarrier_map(subcarriers, active_subcarriers, dc_free=True)
overlap = 2
frame_preamble, x_preamble = preamble.mapped_preamble(p_seed, 'rrc', alpha, active_subcarriers, subcarriers, subcarrier_map, overlap, cp_len, cs_len)
d = utils.get_random_qpsk(timeslots * active_subcarriers, f_seed)
d_frame = mod_frame = gfdm_modulation.modulate_mapped_gfdm_block(d, timeslots, subcarriers, active_subcarriers, overlap, alpha, dc_free=True)
symbol = cyclic_prefix.add_cyclic_starfix(d_frame, cp_len, cs_len)
window_ramp = cyclic_prefix.get_raised_cosine_ramp(cs_len, cyclic_prefix.get_window_len(cp_len, timeslots, subcarriers, cs_len))
d_frame = cyclic_prefix.pinch_block(symbol, window_ramp)
H = filters.get_frequency_domain_filter('rrc', alpha, timeslots, subcarriers, overlap)
return np.concatenate((frame_preamble, d_frame)), mod_frame, x_preamble, d, H
def get_gfdm_frame(data, alpha, M, K, L, cp_len, ramp_len):
window_len = get_window_len(cp_len, M, K)
b = gfdm_modulate_fft(data, alpha, M, K, L)
b = add_cyclic_prefix(b, cp_len)
window_ramp = get_root_raised_cosine_ramp(ramp_len, window_len)
return pinch_block(b, window_ramp)
def get_gfdm_frame(data, alpha, M, K, L, cp_len, ramp_len):
window_len = get_window_len(cp_len, M, K)
b = gfdm_modulate_fft(data, alpha, M, K, L)
b = add_cyclic_prefix(b, cp_len)
window_ramp = get_root_raised_cosine_ramp(ramp_len, window_len)
return pinch_block(b, window_ramp)