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    • 20. 发明授权
    • Signal processing circuit for spread spectrum communications
    • 用于扩频通信的信号处理电路
    • US5881099A
    • 1999-03-09
    • US775763
    • 1996-12-31
    • Kenichi TakahashiMinako TakeishiHiroshi Onishi
    • Kenichi TakahashiMinako TakeishiHiroshi Onishi
    • H04B1/707H04B1/7075H04B1/709H04J11/00H04J13/00H04J13/10H04J13/12H04K1/00H04L27/20H04L27/22
    • H04B1/7075H04B1/707H04B1/709H04J13/00H04J13/12H04J13/10
    • In a transmitting unit, an input signal is converted into an I data sequence of an in-phase (I) symbol and a Q data sequence of a quadrature (Q) symbol, a differential encoding is performed for the I and Q data sequences according to a differential binary phase shift keying (DBPSK) modulation to produce an I code sequence and a Q code sequence, a spectrum of the I code sequence is spread by a first spreading code signal to produce an I spread spectrum signal, a spectrum of the Q code sequence is spread by a second spreading code signal to produce a Q spread spectrum signal, the I and Q spread spectrum signals are quadrature-modulated to a synthesized signal, and the synthesized signal is transmitted to a receiving unit. In the receiving unit, the synthesized signal is quadrature-demodulated to a first baseband signal and a second baseband signal, the first and second baseband signals are respectively correlated with each of the first and second spreading code signals to obtain first and second I correlated signals and first and second Q correlated signals, and a BPSK delay detection is performed for a group of the first and second I correlated signals and a group of the first and second Q correlated signals to reproduce the I and Q data sequences.
    • 在发送单元中,输入信号被转换为正交(I)符号的I数据序列和正交(Q)符号的Q数据序列,对I和Q数据序列执行差分编码, 对于产生I码序列和Q码序列的差分二进制相移键控(DBPSK)调制,I码序列的频谱由第一扩展码信号扩频以产生I扩频信号, Q码序列由第二扩展码信号扩展以产生Q扩频信号,I和Q扩频信号被正交调制为合成信号,合成信号被发送到接收单元。 在接收单元中,合成信号被正交解调为第一基带信号和第二基带信号,第一和第二基带信号分别与第一和第二扩展码信号中的每一个相关,以获得第一和第二I相关信号 以及第一和第二Q相关信号,并且针对一组第一和第二I相关信号和一组第一和第二Q相关信号执行BPSK延迟检测以再现I和Q数据序列。