I, Q signal is how to produce, I, Q signal multiplexing role

The receiver realizes the analog-to-digital transformation and sampling in the intermediate frequency part, and the sampled signal is multiplied with the number field, and the I and Q components of the baseband can be obtained. Each channel that uses a specific carrier frequency, code (spread code and scrambling code) and carrier relative phase (I or Q) can be understood as a class of physical channels when the wireless interface is transmitted.

The spread spectrum of the upstream channel consists of two operations: the first is a channelized operation, which converts each data symbol into several pieces of code, thus increasing the bandwidth of the signal. The number of code slices for each data symbol conversion is called spread spectrum factor. The second one is the scrambling operation, where the scrambling code is added to the spread spectrum signal. In the channelized operation, the data symbols of the I-and Q-paths are multiplied by the orthogonal spread spectrum factor respectively. During the scrambling operation, the signals of the I-and Q-paths are multiplied by the scrambling codes of the plural values.
In the downlink channel spread spectrum, in addition to the other downstream physical channels of Sch, each pair of successive two symbols are divided into I-and Q-Paths after serial and conversion. The tap principle is that even numbered symbols are divided into the I-way and the odd numbered symbols to the Q-path. The real values of I-and Q-paths are spread-spectrum, phase-adjusted, and combined, and become sequences of complex values. This sequence is scrambling with the complex number of scrambling codes sdl,n.

The function of I/Q signal multiplexing is to reduce the peak-to-level ratio of signal power in order to reduce the signal dynamic pointer requirements of transmitters and receivers.

I, Q signal is how to produce, I, Q signal multiplexing role