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channel smoothing update based on HT-SIG field

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mmehari 2022-01-04 22:03:03 +01:00
parent 171ef8b27a
commit 8bc2d7f0a4
2 changed files with 24 additions and 12 deletions
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1
verilog/dot11.v
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@ -372,6 +372,7 @@ equalizer equalizer_inst (
.sample_in_strobe(sync_long_out_strobe), .sample_in_strobe(sync_long_out_strobe),
.ht_next(ht_next), .ht_next(ht_next),
.pkt_ht(pkt_ht), .pkt_ht(pkt_ht),
.ht_smoothing(ht_smoothing),
.phase_in_i(eq_phase_in_i), .phase_in_i(eq_phase_in_i),
.phase_in_q(eq_phase_in_q), .phase_in_q(eq_phase_in_q),

35
verilog/equalizer.v
View File

@ -10,6 +10,7 @@ module equalizer
input sample_in_strobe, input sample_in_strobe,
input ht_next, input ht_next,
input pkt_ht, input pkt_ht,
input ht_smoothing,
output [31:0] phase_in_i, output [31:0] phase_in_i,
output [31:0] phase_in_q, output [31:0] phase_in_q,
@ -151,11 +152,11 @@ reg signed [18:0] lts_sum_q;
reg [2:0] lts_mv_avg_len; reg [2:0] lts_mv_avg_len;
reg lts_div_in_stb; reg lts_div_in_stb;
wire [31:0] dividend_i = (state == S_UPDATE_DC_LTS || state == S_MV_AVG_LTS) ? (lts_sum_i[18] == 0 ? {13'h0,lts_sum_i} : {13'h1FFF,lts_sum_i}) : (state == S_ADJUST_FREQ_OFFSET ? prod_i_scaled : 0); wire [31:0] dividend_i = (state == S_SMOOTH_CH_DC || state == S_SMOOTH_CH_LTS) ? (lts_sum_i[18] == 0 ? {13'h0,lts_sum_i} : {13'h1FFF,lts_sum_i}) : (state == S_ADJUST_FREQ_OFFSET ? prod_i_scaled : 0);
wire [31:0] dividend_q = (state == S_UPDATE_DC_LTS || state == S_MV_AVG_LTS) ? (lts_sum_q[18] == 0 ? {13'h0,lts_sum_q} : {13'h1FFF,lts_sum_q}) : (state == S_ADJUST_FREQ_OFFSET ? prod_q_scaled : 0); wire [31:0] dividend_q = (state == S_SMOOTH_CH_DC || state == S_SMOOTH_CH_LTS) ? (lts_sum_q[18] == 0 ? {13'h0,lts_sum_q} : {13'h1FFF,lts_sum_q}) : (state == S_ADJUST_FREQ_OFFSET ? prod_q_scaled : 0);
wire [23:0] divisor_i = (state == S_UPDATE_DC_LTS || state == S_MV_AVG_LTS) ? {21'b0,lts_mv_avg_len} : (state == S_ADJUST_FREQ_OFFSET ? mag_sq[23:0] : 1); wire [23:0] divisor_i = (state == S_SMOOTH_CH_DC || state == S_SMOOTH_CH_LTS) ? {21'b0,lts_mv_avg_len} : (state == S_ADJUST_FREQ_OFFSET ? mag_sq[23:0] : 1);
wire [23:0] divisor_q = (state == S_UPDATE_DC_LTS || state == S_MV_AVG_LTS) ? {21'b0,lts_mv_avg_len} : (state == S_ADJUST_FREQ_OFFSET ? mag_sq[23:0] : 1); wire [23:0] divisor_q = (state == S_SMOOTH_CH_DC || state == S_SMOOTH_CH_LTS) ? {21'b0,lts_mv_avg_len} : (state == S_ADJUST_FREQ_OFFSET ? mag_sq[23:0] : 1);
wire div_in_stb = (state == S_UPDATE_DC_LTS || state == S_MV_AVG_LTS) ? lts_div_in_stb : (state == S_ADJUST_FREQ_OFFSET ? prod_out_strobe : 0); wire div_in_stb = (state == S_SMOOTH_CH_DC || state == S_SMOOTH_CH_LTS) ? lts_div_in_stb : (state == S_ADJUST_FREQ_OFFSET ? prod_out_strobe : 0);
reg [15:0] num_output; reg [15:0] num_output;
@ -401,8 +402,8 @@ divider norm_q_inst (
localparam S_FIRST_LTS = 0; localparam S_FIRST_LTS = 0;
localparam S_SECOND_LTS = 1; localparam S_SECOND_LTS = 1;
localparam S_UPDATE_DC_LTS = 2; localparam S_SMOOTH_CH_DC = 2;
localparam S_MV_AVG_LTS = 3; localparam S_SMOOTH_CH_LTS = 3;
localparam S_GET_POLARITY = 4; localparam S_GET_POLARITY = 4;
localparam S_CALC_FREQ_OFFSET = 5; localparam S_CALC_FREQ_OFFSET = 5;
localparam S_ADJUST_FREQ_OFFSET = 6; localparam S_ADJUST_FREQ_OFFSET = 6;
@ -502,14 +503,17 @@ always @(posedge clock) begin
lts_raddr <= 62; lts_raddr <= 62;
lts_in_stb <= 0; lts_in_stb <= 0;
lts_div_in_stb <= 0; lts_div_in_stb <= 0;
state <= S_UPDATE_DC_LTS; // Always smooth legacy channel
state <= S_SMOOTH_CH_DC;
end else begin end else begin
lts_waddr <= lts_waddr + 1; lts_waddr <= lts_waddr + 1;
end end
end end
end end
S_UPDATE_DC_LTS: begin // 802.11-2012.pdf: 20.3.9.4.3 Table 20-11
// channel estimate smoothing (averaging length = 5)
S_SMOOTH_CH_DC: begin
if(lts_div_in_stb == 1) begin if(lts_div_in_stb == 1) begin
lts_div_in_stb <= 0; lts_div_in_stb <= 0;
end else if(lts_raddr == 4) begin end else if(lts_raddr == 4) begin
@ -528,7 +532,7 @@ always @(posedge clock) begin
lts_waddr <= 37; lts_waddr <= 37;
lts_raddr <= 38; lts_raddr <= 38;
lts_in_stb <= 0; lts_in_stb <= 0;
state <= S_MV_AVG_LTS; state <= S_SMOOTH_CH_LTS;
end else if(lts_div_out_stb == 1) begin end else if(lts_div_out_stb == 1) begin
lts_i_in <= lts_div_i[15:0]; lts_i_in <= lts_div_i[15:0];
lts_q_in <= lts_div_q[15:0]; lts_q_in <= lts_div_q[15:0];
@ -538,7 +542,9 @@ always @(posedge clock) begin
end end
S_MV_AVG_LTS: begin // 802.11-2012.pdf: 20.3.9.4.3 Table 20-11
// channel estimate smoothing (averaging length = 5)
S_SMOOTH_CH_LTS: begin
if(lts_raddr == 42) begin if(lts_raddr == 42) begin
lts_sum_i <= lts_sum_1_3_i; lts_sum_i <= lts_sum_1_3_i;
lts_sum_q <= lts_sum_1_3_q; lts_sum_q <= lts_sum_1_3_q;
@ -738,7 +744,12 @@ always @(posedge clock) begin
lts_raddr <= 62; lts_raddr <= 62;
lts_in_stb <= 0; lts_in_stb <= 0;
lts_div_in_stb <= 0; lts_div_in_stb <= 0;
state <= S_UPDATE_DC_LTS; // Depending on smoothing bit in HT-SIG, smooth the channel
if(ht_smoothing) begin
state <= S_SMOOTH_CH_DC;
end else begin
state <= S_GET_POLARITY;
end
end else begin end else begin
lts_waddr <= lts_waddr + 1; lts_waddr <= lts_waddr + 1;
end end