求翻译：但是，编码类技术的技术复杂度非常高，编解码都比较麻烦。更重要的是，这类技术的信息速率降低得很快，因此只适用于子载波数比较少的情况。是什么意思？

However, the coding type of technology is very high degree of technical complexity, encoding and decoding are more troublesome. More importantly, these technologies reduce the rate of information very quickly, so apply only to the number of subcarriers relatively few cases.

However, coding such technology at the technical complexity is very high, codecs are cumbersome. More importantly, this type of technology rate of reduction of information very quickly, and therefore are only applicable to a carrier of a relatively few cases.

But, the code class technology technical order of complexity is extremely high, arranges the decoding quite to be all troublesome.More importantly, this kind of technical information speed reduces very quickly, therefore is only suitable for the sub-carrier number quite few situations.

However, the technical complexity of the encoding class technology is very high, codec is too much trouble. More important is that the rates of such technical information fast, therefore apply only to the subcarrier number is relatively small.

However, the coding type of technology is very high degree of technical complexity, encoding and decoding are more troublesome. More importantly, these technologies reduce the rate of information very quickly, so apply only to the number of subcarriers relatively few cases.