Motorola Scrambling Code Generation for WCDMA on the StarCore SC140 Core.pdf
In a Wideband Code Division Multiple Access (WCDMA) environment, each user is assigned a unique complex scrambling sequence to encode its information-bearing signal. The receiver has the scrambling code of the user, unscrambles the received signal, and recovers the original data [1]. This application note presents a method for complex pseudo-random sequence (PN code) generation and complex scrambling of an I/Q code multiplexed signal on a StarCore® SC140 digital signal processor (DSP). The PN codes in this application note are generated for a WCDMA Universal Mobile Telecommunications Systems (UMTS) uplink (signal from handset to base station) according to the third-generation partnership project (3GPP) specifications.
This application note provides practical information to help users understand PN code generation and complex scrambling, which are required in the WCDMA standards. Typically, these operations are performed on Architecture-Specific Integrated Circuits (ASICs), but here we explore the use of the Motorola StarCore SC140 digital signal processing (DSP) core to accomplish the same task.
Contents:
- Pseudo-Random
- Sequences
- Randomness Properties Generating Pseudo-Random Sequences
- Scrambling Codes for WCDMA
- Generating Long Complex Scrambling Codes
- Scrambling an I-Q/Code Multiplexed Signal
- Software Implementation on the StarCore SC140 Core
- Allocating Memory Space
- Generating Binary PN Code and Forming Complex Scrambling Sequences
- Forming the Complex Scrambling Sequences
- Complex Scrambling of an IQ/Code Multiplexed Signal
- Results
- References
Download free Application Note AN2254/D Rev. 0, 4/2002 of Motorola Scrambling Code Generation for WCDMA on the StarCore SC140 Core.pdf (20 pages 0.6 MB).
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