Title :
Real-time multimedia broadcasting via direct-detection fiber-optic synchronous CDMA networks
Author :
Liu, Maw-Yang ; Tsao, Hen-Wai
Author_Institution :
Graduate Inst. of Commun. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
9/1/1998 12:00:00 AM
Abstract :
A new coding architecture for M-ary fiber-optic synchronous code division multiple access (CDMA) network is proposed to provide real-time multimedia broadcasting. In contrast with variable bit rate (VBR) transmission, the constant bit rate (CBR; i.e. isochronous) transport is more preferable in view of the networking simplicity. We apply a bit-stuffed unipolar m-sequence and maximum a posteriori (MAP) receiver in the proposed network. The system performance is determined by the following parameters: (1) number of simultaneous access broadcasting hosts K, (2) received laser power, (3) input bit rate, and (4) the dimension of M. Furthermore, the adverse impact (thermal noise, APD noise) in the photodetection process is carefully analyzed. Numerical results reveals that for the binary case, the aggregate capacity can achieve 10.2 Gbps
Keywords :
avalanche photodiodes; broadcasting; code division multiple access; encoding; maximum likelihood detection; multimedia communication; optical fibre networks; optical receivers; optical signal detection; real-time systems; semiconductor device noise; sequences; thermal noise; 10.2 Gbit/s; APD noise; CBR transport; M-ary CDMA network; MAP receiver; VBR transmission; aggregate capacity; bit-stuffed unipolar m-sequence; coding architecture; constant bit rate; direct-detection fiber-optic synchronous networks; input bit rate; isochronous transport; maximum a posteriori receiver; photodetection process; real-time multimedia broadcasting; received laser power; simultaneous access broadcasting hosts; system performance; thermal noise; variable bit rate; Bit rate; Code division multiplexing; Correlators; Digital multimedia broadcasting; Multiaccess communication; Multimedia communication; Optical fiber networks; Optical noise; Optical receivers; Signal to noise ratio;
Journal_Title :
Broadcasting, IEEE Transactions on
