Apparatuses and methods for power amplification and signal transmission using complex delta-sigma modulation are disclosed. In one embodiment, a complex delta sigma modulator unit comprising a complex polar quantizer within an integrator loop is disclosed. The complex polar quantizer quantizes the envelope of a complex integrated signal and produces a complex quantized output signal of substantially constant envelope. The complex quantized output signal is used in deriving a complex feedback signal within the integrator loop of the complex DSM. The complex quantized output signal may be used in driving a power amplifier substantially at saturation. In some embodiments, an adjacent channel power ratio (ACPR) enhancement technique is used to reduce the quantization noise in the complex quantized output signal.

Apparatuses and methods for power amplification and signal transmission using complex delta-sigma modulation are disclosed. In one embodiment, a complex delta sigma modulator unit comprising a complex polar quantizer within an integrator loop is disclosed. The complex polar quantizer quantizes the envelope of a complex integrated signal and produces a complex quantized output signal of substantially constant envelope. The complex quantized output signal is used in deriving a complex feedback signal within the integrator loop of the complex DSM. The complex quantized output signal may be used in driving a power amplifier substantially at saturation. In some embodiments, an adjacent channel power ratio (ACPR) enhancement technique is used to reduce the quantization noise in the complex quantized output signal.

A data transmission method and apparatus are disclosed, to help reduce quantization loss of data that is not uniformly distributed, thereby improving data transmission efficiency. The method includes: selecting a target data distribution model from a plurality of data distribution models based on to-be-compressed data, the plurality of data distribution models, and a first uniform quantizer; determining target compressed data based on the target data distribution model; and sending the target compressed data and first information to a receive end, where the first information includes information identifying the target data distribution model.

This application provides a data processing method and apparatus. The method is applied to a storage system. The storage system includes a storage apparatus and a processing apparatus. The method is performed by the processing apparatus. The method includes: obtaining a tiered storage feature and a data feature of first data, where the tiered storage feature includes at least one of the following features: an importance, an access frequency, and a retention time, and the data feature includes at least one of the following features: a data type, a data dimension, a data size, or a data content feature; determining a first compression algorithm based on the tiered storage feature and the data feature; and compressing the first data based on the first compression algorithm, to obtain compressed data.