Marshall注:本博文重点关注了与polar code相关的比特级处理。
物理信道映射
上行
下行
通用流程
来自MAC层/向MAC层输出的数据和控制流经过编/解码,通过无线传输链路提供传输和控制服务。信道编码方案是错误检测、错误纠正、速率匹配、交织以及传输信道或控制信息向物理信道映射/从物理信道到传输信道控制信息解析或分离的组合方案。
CRC计算
CRC计算单元的输入比特为$ { {a}{0}},{ {a}{1}},{
{a}{2}},{ {a}{3}},...,{ {a}{A-1}} \(,奇偶校验比特为\) { {p}{0}},{
{p}{1}},{ {p}{2}},{ {p}{3}},...,{ {p}{L-1}} \(。\) A \(是输入序列的长度,\) L
$是校验比特数目。校验比特由下列循环生成多项式之一产生:
- $ { {g}_{}}( D )=[{ {D}^{24}}+{ {D}^{23}}+{ {D}^{18}}+{ {D}^{17}}+{
{D}^{14}}+{ {D}^{11}}+{ {D}^{10}}+{ {D}^{7}}+{ {D}^{6}}+{ {D}^{5}}+{
{D}^{4}}+{ {D}^{3}}+D+1] \(,CRC长度\)
L=24 $;
- $ { {g}_{}}( D )=[{ {D}^{24}}+{ {D}^{23}}+{ {D}^{6}}+{ {D}^{5}}+D+1]
\(,CRC长度\) L=24 $;
- $ { {g}_{}}( D )=[{ {D}^{24}}+{ {D}^{23}}+{ {D}^{21}}+{ {D}^{20}}+{
{D}^{17}}+{ {D}^{15}}+{ {D}^{13}}+{ {D}^{12}}+{ {D}^{8}}+{ {D}^{4}}+{
{D}^{2}}+D+1] \(,CRC长度\) L=24
$;
- $ { {g}_{}}( D )=[{ {D}^{16}}+{ {D}^{12}}+{ {D}^{5}}+D+1] \(,CRC长度\) L=16 $