计算机网络习题求解Suppose that data are transmitted in blocks of size
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计算机网络习题求解
Suppose that data are transmitted in blocks of sizes 1000 bits.What is the
maximum bit error rate under which error detection and retransmission mechanism (1 parity bit per
block) is better than using Hamming code?Assume that bit errors are independent of one another
and no bit error occurs during retransmission.
Suppose that data are transmitted in blocks of sizes 1000 bits.What is the
maximum bit error rate under which error detection and retransmission mechanism (1 parity bit per
block) is better than using Hamming code?Assume that bit errors are independent of one another
and no bit error occurs during retransmission.
假设传输数据时使用1000比特位每块进行传输,为什么使用错误检测与广播重传机制(1位奇偶校验)的最大误码率比海明校验码要好?设发生比特错误是独立事件且传输过程中没有发生比特错误.
奇偶校验能够检测出信息传输过程中的部分误码(同时,它不能纠错.在发现错误后,只能要求重发;
同样的海明校验码也只能检测1位错误,如果两位错误会误认为是对的不进行重传;
个人理解,英文没有上下文也看不太懂~也不太会概率分析~
奇偶校验能够检测出信息传输过程中的部分误码(同时,它不能纠错.在发现错误后,只能要求重发;
同样的海明校验码也只能检测1位错误,如果两位错误会误认为是对的不进行重传;
个人理解,英文没有上下文也看不太懂~也不太会概率分析~
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