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Divide TX's output by 4 to ensure eveything fits within 12bit IQ

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This is due to a 48 carrier + 4 pilot OFDM symbol having a high PAPR.
This commit is contained in:
Robert Ghilduta 2021-10-04 15:54:07 -07:00
parent 8d9ffaa81c
commit 0a0a3ea8d0
1 changed files with 2 additions and 6 deletions
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8
fpga/vhdl/wlan_top.vhd
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@ -179,8 +179,6 @@ architecture arch of wlan_top is
signal tx_wlan_fifo_empty : std_logic ;
signal bb : wlan_sample_t ;
signal done : std_Logic ;
signal scaled_out_i : signed(11 downto 0);
signal scaled_out_q : signed(11 downto 0);
function NULL_RX_STATE return state_rx_t is
variable rv : state_rx_t;
@ -408,10 +406,8 @@ begin
tx_idle <= '1' when (current_tx_state.fsm /= IDLE) else '0' ;
scaled_out_i <= to_signed( to_integer(bb.i/2 - bb.i/8 - bb.i/16), 12 ) ;
out_i <= scaled_out_i(11) & scaled_out_i(11) & scaled_out_i(11) & scaled_out_i(11) & scaled_out_i;
scaled_out_q <= to_signed( to_integer(bb.q/2 - bb.q/8 - bb.q/16), 12 ) ;
out_q <= scaled_out_q(11) & scaled_out_q(11) & scaled_out_q(11) & scaled_out_q(11) & scaled_out_q;
out_i <= resize(shift_right(bb.i, 2), 16);
out_q <= resize(shift_right(bb.q, 2), 16);
out_valid <= bb.valid;
rx_fifo_data <= current_rx_state.rx_word ;