Apparatus and method for control of power ratios for in-phase and quadrature channels in a communications system

摘要

A transmitter in a radiocommunications system such as a Wideband Code Division Multiple Access (WCDMA) communications system transmits one set of data on an in-phase (I-) channel and another set of data on a quadrature (Q-) channel. The transmitter generates a gain signal, β, and multiplies the digital data associated with the Q-channel by the gain signal, β. Complexity of the multiplication operation is reduced by limiting the gain signal, β, to a finite number of values that are exactly representable by a predefined number of bits, such as 4-bit values to the right of a binary radix point. Modulation inaccuracy associated with quantization of β can be eliminated by utilizing the same quantized values of β in all components within the radiocommunications system.