{'fraction_non_alphanumeric': 0.028265107212475632, 'fraction_numerical': 0.003898635477582846, 'mean_word_length': 5.149700598802395, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Channel assignment in CDMA systems with Walsh and PN coding

Many channels assignment procedures and allocation strategies for cellular network have been discussed for various multi-access methods. The channel allocation both for new calls and for handovered ones should minimise the co-channel interference. In CDMA, channels are creating by spreading and accessing codes. The signal-to-noise ratio (SNR) is generally dependent on the number of users N and correlation coefficients r/sub k,i/ between sequences used for transmission. The codes assignment method based on the Hopfield neural network (HNN) with Kohonen (1982) self-organised future maps (KSOFM) is presented. A two-stage algorithm is proposed for DS-CDMA systems with heterogeneous cells. The cross-correlation coefficients are the main factors of minimised cost function that is calculated for the various traffic and multi-access interference parameters. The simulation model was examined for a number of PN sequences as well as for orthogonal Walsh mapping.