Which is larger bit error rate or code error rate

The highest bit error rate represents the theoretical maximum BER of 1, meaning every transmitted bit is received incorrectly, while the standard BER measures the actual observed error ratio under given conditions.Bit Error Rate (BER) OverviewThe bit error rate (BER) is the ratio of incorrectly received bits to the total number of bits transmitted over a communication channel during a specific interval of time, expressed as a unitless ratio or percentage (e.g., 10⁻⁵) . It quantifies the integrity of a digital link and is a key metric for evaluating signal quality, reliability, and system performance . For example, if 1,000,000 bits are transmitted and 10 are received incorrectly, the BER is 10/1,000,000 = 10⁻⁵ .Highest Bit Error RateThe highest possible BER occurs when every transmitted bit is received incorrectly, resulting in a BER of 1 (or 100%) . This represents a complete failure of the communication channel, where no information is transmitted correctly. In practical systems, such a scenario is extremely rare, as it would require the signal to be entirely corrupted by noise, interference, or other impairments.Relationship Between Standard BER and Maximum BERStandard BER measures the actual error ratio observed during normal operation, which is typically much lower than 1, often in the range of 10⁻⁵ to 10⁻¹² depending on the technology and application .Maximum BER is a theoretical limit, indicating the worst-case scenario. It is not a typical measurement but serves as a reference for understanding the upper bound of errors.BER values closer to 1 indicate extremely poor signal quality, while values near zero indicate highly reliable transmission .Practical ImplicationsIn real-world systems, achieving a zero BER is nearly impossible due to noise, interference, and channel imperfections . Engineers use BER testing to ensure that the observed BER remains well below acceptable thresholds, maintaining system reliability and quality of service. Understanding the concept of the highest BER helps in designing error-correction schemes and evaluating system robustness under extreme conditions .