Software Implementation Of RS Codes & Convolutional Codes And WCDMA Trial Network RF Optimization

With the quickly development of modern telecommunication technology and computer science, the end user's requirement for quality of service and data transmission rate is continually improving. In a communication system, after noisy channel transmission, signal distortion will inevitably appear as a consequence of communication channel noise interference and fading characteristic, when information signal reaching the receiver side. Usually there is need to use error control coding to detect and correct those transmission errors caused by signal distortion. Error control coding mainly used in channel carry out error correction, it also called as error correct coding or channel coding. In the evolution of error control coding, RS codes and convolutional codes act important role. Coding has become an integral part of almost any system involving the transmission or storage of digital information. Examples such as earlier time deep space communication and satellite communication, later CD disc, and now widely used digital TV, ADSL modem device and mobile phone, all used RS codes and convolutional codes as their component codes in the base layer. Supported by the national high technology research and development program of China 863-program, granted No. 2002AA119010, this thesis focuses on the software implementation of RS codes and convolutional codes, and make some optimization in the program implementation. In the software implementation of RS codes, the frequently called parts of the program are deeply analysis, such as mod operation, Galois field operation. So application of the inline function and field element transfer array is presented for this parts to accelerate program running. Check bit of divide operation circuits of RS codes is realized by using shift registers. With regard to program of Berlekamp-Massey operation, precise designs are did too, such as polynomial multiply and convolution, used some carefully design rules to speed up the algorithm. In the software implementation of convolutional codes, in the design part of measurement distance array, define two arrays repetitive execution array update according to reasonable arrangement of butterfly operation order. Present a macro definition in the butterfly operation instead of subroutine program. Hope to shorten the operation running time via these structure arrangement and design. Finally introduce some concept of WCDMA trial network RF optimization. WCDMA trial network configuration, discussed in detail of the single system test RF optimization steps, introduce the application of test instrument TEMS, give 2 examples of RF optimization in Beijing 3G trial network using TEMS.