channel power 与thermal power的区别

channel power 与thermal power的区别

测量条件不一样，具体参照34.121

When the RRC Filter for the channel power measurement is turned on, the results are typically about 0.25 dB lower than the thermal power measurement results.

Thermal power performance is only specified for signals down to -10 dBm, while the channel power measurement is able to accurately measure signals down to -61 dBm

RRC FILTER

The signal can be filtered in the DSP with a root-raised cosine (RRC) filter with a rolloff of 0.22 and a bandwidth equal to the chip rate (3.84 MHz) to comply with 3GPP 34.121 conformance specifications that require RRC filtered power. The filter can also be turned off for conformance specifications requiring a mean power measurement. When the RRC filter is Off , the bandwidth of the channel power measurement is greater than (1+alpha) times the chiprate, where alpha=0.22.

照字面的理解应该是Thermal power 测量的信号贷款大于channel power ，因为没有大家RRC FILTER ,所以测量的功率比channel power 大0.25DB左右，多余的部分应该是噪声功率。channel power 的测量则打开了RRC FILTER，进行了必要的滤波，所以功率稍小。

?????? 功率测试有两种方式：Channel Power 和 Thermal Power，字

面上翻译是信道功率和热功率。热功率也可理解为‘有噪声’的功率。

由于Thermal power没有用RRC Filter滤波，功率会稍高一点。

??????? thermal power测试的功率范围底线到-10dBm，而channel power相应底线可到-61dBm。从这点不同也可以理解测试最大功率测试用thermal power，最小功率测试用channel power。

When the RRC Filter for the channel power measurement is turned on, the results are typically about 0.25 dB lower than the thermal power measurement results.

Thermal power performance is only specified for signals down to -10 dBm, while the channel power measurement is able to accurately measure signals down to -61 dBm.