完整写一个verilog代码的polar极化码编码译码过程,译码算法为SC译码算法,选择LLR方式,其信道为高斯白噪声信道
时间: 2024-09-23 08:03:19 浏览: 53
在Verilog语言中,Polar码的编码和解码通常涉及到连续相位旋转门(CPR)、逐比特计算(Permutation)以及软输入软输出(LLR)处理。这里是一个简单的SC (Successive Cancellation) 编码和解码过程的示例,假设我们有一个BCH模版长度为N的Polar码:
```verilog
module polar_encoder(
input [log2(N)-1:0] info_bits, // 输入的信息位流
output reg [N-1:0] coded_bits // 输出的编码位流
);
// SC Encoder
always @(info_bits) begin
wire [N-1:0] frozen_bits = {1'b0, N - 1'b1}; // 冻结位设为全0和全1
for (int i = log2(N)-1; i >= 0; i--) begin
if (i < log2(frozen_bits[0])) continue; // 跳过冻结位
coded_bits[i] = info_bits[i] ^ frozen_bits[i]; // 根据SC规则编码
end
end
module polar_decoder(
input [N-1:0] channel_symbols, // 输入经过信道后的信号
input [N-1:0] channel_llrs, // 输入信道LLRs
output reg [log2(N)-1:0] decoded_bits // 输出解码后的信息位流
);
// LLR Processing
reg [N-1:0] llr_sum = 0;
reg [N-1:0] decoded_sum = 0;
always @(channel_symbols, channel_llrs) begin
for (int i = 0; i < N; i++) begin
llr_sum[i] = channel_llrs[i];
if (channel_symbols[i] == 0) begin
decoded_sum[i] = 0; // 如果符号为0,则LLR加到总和上
end else if (channel_symbols[i] == 1) begin
decoded_sum[i] = channel_symbols[i] - channel_llrs[i]; // 如果符号为1,考虑LLR影响
end
end
// SC Decoder with LLR-based decision
for (int i = log2(N)-1; i >= 0; i--) begin
if (i < log2(frozen_bits[0])) continue;
decoded_bits[i] = decoded_sum[i] > 0 ? 1'b1 : 1'b0; // SC决策
end
end
endmodule
```
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