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    • 3. 发明授权
    • Digital communication system
    • 数字通讯系统
    • US4807252A
    • 1989-02-21
    • US46787
    • 1987-05-07
    • Fumio IkegamiSusumu YoshidaTsutomu TakeuchiSirikiat Ariyavisitakul
    • Fumio IkegamiSusumu YoshidaTsutomu TakeuchiSirikiat Ariyavisitakul
    • H04L27/18H04L27/20H04L27/233
    • H04L27/2085H04L27/2331
    • The present invention provides a digital communication system in which one time slot is divided into a first half section and a second half section and the carrier phase difference .theta. between each neighboring first half section is set to either (.pi., 0) with respect to a binary information symbol (1,0) or (0, .pi./2, .pi., 3/2.pi.) with respect to a quaternary information symbol (11, 01, 00, 10). In addition, the phase difference .psi. between the first half and the second half of any time slot is a constant value .psi..sub.0 (for example, .pi.rad) irrespective of the symbol, or .psi..sub.i determined with respect to a symbol (for example, +.pi./2 with respect to a symbol 1 or -.pi./2 with respect to a symbol 0). Therefore, an arbitrary complementary characteristic can be obtained when differentially demodulated in a multipath fading channel, irrespective of the amplitude characteristic of a demodulation signal.
    • 本发明提供了一种数字通信系统,其中一个时隙被分成第一半部分和第二半部分,并且每个相邻的前半部分之间的载波相位差θ相对于一个时隙被设置为(pi,0) 二进制信息符号(1,0)或(0,pi / 2,pi,3/2 pi)相对于四元信息符号(11,01,00,10)。 此外,任何时隙的前半部分和后半部分之间的相位差压力值是与符号相关的常数值psi 0(例如,pi rad),或者相对于符号确定的psi i(例如, + pi / 2相对于符号1或-π/ 2相对于符号0)。 因此,无论解调信号的振幅特性如何,都可以在多路径衰落信道中进行差分解调时获得任意的互补特性。