An Tran Van Su creator O'Farrell, T. Chairperson (Chairman - upto 31/10/94) Makelainen, Kimmo Chairperson Erke, Tapio J. Examination Committee Takahashi, Kenzo Examination committee Finnish International Development Agency (FINNIDA) Scholarship donor text series technical report th Bangkok Asian Institute of Technology 1994 continuing eng 53 leaves In this research study an investigation into performance of direct-sequence spread spectrum multiple-access (DS/SSMA) communications with deterministic complex signature sequences is presented. The Discarding Sorting (DS) and Enhancing Sorting (ES)-Algorithms are introduced to select the good subset with average interference parameter (AIP) criterion. Expressions for the signal to noise ratio (SNR) and the bit error rate (BER) at the output of correlator are derived. These expressions are used to evaluate the SNR and BER performance both as a function of number of simultaneous users and as a Eb/ N 0 . It is shown that the complex sequences can yield better probability of error performance then binary sequences. New users that employ complex signature sequences can be added into existing systems with graceful performance degradation. A research submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology Research Studies Project Report (M.Eng.) - Asian Institute of Technology, 1994 Spread spectrum communications Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B15561 http://203.159.5.9/ait-thesis/detail.php?q=B15561 121095 20260818144307.0