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자료유형
학술저널
저자정보
저널정보
SK텔레콤 Telecommunications Review Telecommunications Review 제23권 제4호
발행연도
2013.1
수록면
501 - 515 (15page)

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초록· 키워드

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Probability of bit-error performance of asynchronous direct-sequence code-division multiple-access (DS- CDMA) wireless communication systems employing the generalized detector (GD) is analyzed. GD is constru- cted based on the generalized approach to signal processing in noise. The effects of pulse shaping, quadriphase or direct sequence quadriphase shift keying (DS-QPSK) spreading, aperiodic spreading sequences are conside- red in DS-CDMA based on GD and compared with the coherent Neyman-Pearson, Rake, and linear MMSE receivers. An exact expression and several approximations: one using the characteristic function method, a simplified expression for the improved Gaussian approximation (IGA) and the simplified improved Gaussian approximation are derived. Under conditions typically satisfied in practice and even with a small number of interferers, the standard Gaussian approximation (SGA) for the multiple-access interference component of the GD statistic and performance is shown to be accurate. Moreover, the IGA is shown to be reduced to the SGA for pulses with zero excess bandwidth. Second, the GD performance of quadriphase DS-CDMA is shown to be superior to that of bi-phase DS-CDMA. Numerical examples by Monte Carlo simulation are presented to illustrate the GD performance for squareroot raised-cosine pulses and spreading factors of moderate to large values. Also, a superiority of GD employment in CDMA systems over the Neyman-Pearson receiver is presented.

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