Device and method for serial descrambling and de-spreading of mobile communication system

Abstract

The invention relates to a device and a method for serial descrambling and de-spreading of a mobile communication system. The device is characterized by comprising a local code control information generator, a descrambling and de-spreading unit, a reset time schedule controller and a symbol selector, wherein the local code control information generator generates control information with 2-time code chip rate according to scrambling codes and spreading codes; the descrambling and de-spreading unit performs descrambling and de-spreading on data according to code control information; the reset time schedule controller controls the reset of the descrambling and de-spreading unit; and the symbol selector performs symbol sampling on descrambling and de-spreading results and outputs the descrambling and de-spreading result of a branch, wherein the local code control information generator, the reset time schedule controller and the symbol selector are connected into the descrambling and de-spreading unit respectively. Thus, by using a full adder and an xor device, the multiplication of a code chip, the scrambling codes and spreading codes and the accumulation of the multiplication resultsof the code chip can be finished at the same time so as to implement the process of descrambling and de-spreading, and the device and the method are suitable for achieving an integrated circuit in the mobile communication system.

Description

technical field [0001] The invention relates to a method and device for descrambling and despreading, in particular to a device for serial descrambling and despreading of a mobile communication system, which belongs to the technical field of electrical communication. Background technique [0002] With the development of mobile communication technology, while the performance of the wireless communication system is improving day by day, the complexity of the system is also increasing. As for the user terminal chip of the mobile communication system, reasonable cost and power consumption are also required while achieving high performance. [0003] In a code division multiple access wireless communication system, receiver (RAKE) reception is a common sampling method. In TD-SCDMA, a wireless communication system, the number of branches of the receiver is greatly increased due to the joint detection method. Moreover, in the baseband chip of the user terminal, the resources consu...

AI Technical Summary

Problems solved by technology

For example, the fast Walsh-Hadamard transform (FWHF) structure is used for despreading, but the scrambling codes of different branches need to be the same, which is not suitable for TD-SCDMA user terminals with multi-cell joint detection

Similarly, if the chip data and the scrambling code spreading code are directly multiplied and added, the operation of multiplying by -1 is required, that is, the data is reversed and 1 is added, and the I component and the Q component are respectively accumulated. Comparison takes up logical resources

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