请教各位一个HARQ的问题

没有译码怎么判断要不要重传？这样做是想看HARQ什么性质呢？

HARQ是FEC和ARQ的结合，FEC指的是forward error control,这就需要前向纠错编码，所以没有编码就谈不上HARQ。 不同类型HARQ每次传输的内容的不一样，这种内容的区别主要体现在冗余比特的处理上，也即校验比特的处理，而校验比特就是编码的过程生成的。 【 在 ALMA 的大作中提到: 】 : 研究三种类型HARQ的性能，如果省略了编译码模块，在物理层进行仿真，即发出一千个0、1随机信号，调制后经过白高斯信道，再解调接收，最后画出误比特率和信噪比的模块，该怎么研究？一直以为HARQ三种类型的区别就是体现在编译码部分的，现在不用译码了，不知道这三种类型还能有什么区别。。。

借楼问，IR的合并方式究竟是怎么合？全冗余的IR

才出炉的一段Introduction，不排除有语法错误： Type I It based on the basic ARQ and just introduces FEC. The source information is coded with a fixed code rate. Once the received block is found erroneous by CRC decoder, the current block is rejected and retransmission request will send back. This scheme is not adaptive based on the time-varying channel. Type II To adapt the encoder rate to the time-varying channel condition, type II HARQ adopts Incremental Redundancy (IR) transmission by progressively transmitting parity bits, which are necessarily combined with the previously received blocks to extract the information. For parity bits are only sent to the receiver at retransmission, the retransmitted block is not self decodable. Type III Each retransmission block in the scheme includes not only parity bits but also information bits and is self decodable. Decoder extracts the information either by combining previously received blocks for the same source information or by using only the last received block. RCPC (Rate-Compatible Punctured Convolutional Codes) and RCPT (Rate-Compatible Punctured Turbo Codes) are two types of codes scorresponding to type III HARQ scheme.

哦，系统级仿真？ 区别在于在相同信噪比，相同重传次数，相同信息位，和相同传输总比特数下， BER（2型）<BER（3型）<BER（1型） 【 在 ALMA 的大作中提到: 】 : 研究三种类型HARQ的性能，如果省略了编译码模块，在物理层进行仿真，即发出一千个0、1随机信号，调制后经过白高斯信道，再解调接收，最后画出误比特率和信噪比的模块，该怎么研究？一直以为HARQ三种类型的区别就是体现在编译码部分的，现在不用译码了，不知道这三种类型还能有什么区别。。。

这是你写的？ 【 在 gangpower 的大作中提到: 】 : 才出炉的一段Introduction，不排除有语法错误： : Type I : It based on the basic ARQ and just introduces FEC. The source information is coded with a fixed code rate. Once the received block is found erroneous by CRC decoder, the current block is rejected and retransmission request will send back. This scheme is not adaptive based on the time-varying channel. : ...................

好高深

【 在 outsmart 的大作中提到: 】 : 借楼问，IR的合并方式究竟是怎么合？全冗余的IR IR合并bit级的合并方式, CC合并是symbol级的合并