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Performance study of linear and nonlinear diversity-combining techniques in synchronous FFH/MA communication systems over fading channels

Performance study of linear and nonlinear diversity-combining techniques in synchronous FFH/MA communication systems over fading channels

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Based on the Fourier-Bessel series and exponential characteristic function approach, the paper presents analytical bit-error-rate expressions for synchronous fast frequency-hopped spread-spectrum multiple-access systems over Rician fading channels with M-ary frequency-shift-keying modulation. Linear-combining, product-combining and clipper receivers are studied. Numerical results show that both the clipper and product-combining receivers perform significantly better than the linear-combining receiver. The clipper receiver with an optimum threshold level slightly outperforms the product-combining receiver. However, the product-combining receiver is the preferred diversity-combining method because it is completely nonparametric. In addition, the optimum diversity levels for various diversity-combining receivers over Rayleigh fading channels are higher than that of the Rician fading channels.

Inspec keywords: Rician channels; Bessel functions; Fourier series; spread spectrum communication; multi-access systems; diversity reception; frequency shift keying; frequency hop communication; Rayleigh channels; radio receivers; error statistics

Other keywords: Rayleigh fading channel; nonlinear diversity-combining technique; BER expression; bit-error-rate; linear-combining receiver; fast frequency-hopped multiple-access; Fourier-Bessel series; exponential characteristic function; product-combining receiver; Rician fading channel; synchronous FFH-MA communication system; spread-spectrum multiple-access system; M-ary frequency-shift-keying modulation; clipper receiver

Subjects: Multiple access communication; Radio links and equipment; Mathematical analysis; Modulation and coding methods; Other topics in statistics

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