Authors
Abstract
This work is a proposed simulation for forward link channel of CDMA2000 -1x
system by using QPSK, 8QAM and 16QAM, and converting the proposed system
to VHDL language by using Simulink HDL Coder for implementing in FPGA
board.
The results of simulation for forward link channel of CDMA2000 system shows
improvement when using three levels of codes (LPNC, Walsh code and complex
coding) in the present of AWGN for QPSK modulation the system performance is
improved from (1.8 to 1.9) in dB for BER (Bit Error Rate) 10 to 10 and for
8QAM the system performance is improved at (2.9) in dB for BER 10 to 10
and for 16QAM the system performance is improved from (1 to 1.2) in dB for BER
10 to 10 . The results of simulation in the present of AWGN and Rayleigh
fading channel are improvement within (0.5) in dB for the different Doppler
Frequencies (5 - 230Hz).
The Simulink HDL Coder has been used for converting the MATLABSimulink
models to VHDL language. The verification of the generated VHDL
code has been done using Altera-ModelSim program, while the synthesis reports
and board programming files have been obtained using the Quartus II program.
System implementation has been done using FPGA technology with Altera
Cyclone II boards. The implementation of the forward link channel by using
Simulink HDL coder shows feasibility and flexibility in solving the problem of
complex multiplication of complex spreading code also the practical results were
closed to that obtained from ModelSim program.
Keywords
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