ABSTRACT
In this paper, the design is based on construct BPSK baseband system. We further study the BPSK modulation system with C language and MATLAB programming tool , and use C language achieves the above-mentioned BPSK modulation algorithms. Simultaneously ,the performance of system is evaluated for different kind of channel noise such as Rayleigh channel, Gaussian channel through the bit error rate . moreover, it is great improved to use convolution code in each kind of channel damage. last the bit error rate(BER) diagram of curves is drawed with the C language and the MATLAB connection programming.
Phase shift keying (PSK) with the early development of the space program, now BPSK is widely used in military and commercial communication system. and BPSK modulation technique is widely used in the second generation mobile communication system，especially，in base station. the BPSK modem was adopted for in the third generation mobile communication system, such as WCDMA and CDMA2000. BPSK modulation is also applied to convolution code to improve the performance of the system.BPSK is mainly applied in fixed frame format in wireless communication system standard，BPSK modulation technique is also the part of basic foundation, it is a follow-up research for other system lays the foundation.
Keywords: BPSK, BER, Convolution code, Rayleigh channel, Gaussian channel
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