Simulation Program for CDMA Transceiver Functionality

This program simulates the complete functionality of CDMA transceivers (both receiver and transmitter). The receiver section implements five key processing modules: despreading using complementary codes, deinterleaving to reverse the transmission permutation, channel decoding with Viterbi algorithm for convolutional codes, source decoding, and CRC error detection decoding. These modules collectively regenerate the original signal sequences for digital baseband transmission. The transmitter section comprises six functional modules: pseudo-random sequence generation for data simulation, tail bit insertion (add_bits) for proper source coding termination, convolutional encoding with specific polynomial generators, block interleaving for burst error protection, and spread spectrum modulation using orthogonal codes. These components generate formatted signal sequences ready for digital baseband transmission. The implementation includes critical parameters for demodulation: add_bits (tail bits for source coding termination) and i_add_bits (tail bits for interleaver synchronization). The modular architecture allows realistic simulation of complete CDMA communication chain operations, with each module containing configurable parameters for different communication scenarios. The code structure employs matrix operations for efficient signal processing and includes error handling mechanisms for invalid input sequences.