一种基于内存的预滤波和预失真的pi /4直接DQPSK调制器

IEEE WESCANEX 93 Communications, Computers and Power in the Modern Environment - Conference Proceedings Pub Date : 1993-05-17 DOI:10.1109/WESCAN.1993.270576

S. Kumar, T. Danshin

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引用次数: 0

摘要

描述了一种用于北美数字蜂窝应用的直接pi /4微分正交相移键控(DQPSK) 48.6 kb/s 824-849 mhz调制器。利用数字存储电路实现了滚降系数为0.35的平方根提升余弦滚降预滤波。采用相同的存储电路对双相衰减器的非线性进行预失真处理。虽然调制器的预失真只被纳入，但同样的电路可以用于功率放大器非线性的预失真。该调制器适用于将数字电路和存储电路集成在同一芯片上的单片微波集成电路(MMIC)实现。给出了测量结果。

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A direct pi /4 DQPSK modulator with memory based prefiltering and predistortion

A direct pi /4 differential quadrature phase shift keying (DQPSK) 48.6-kb/s 824-849-MHz modulator for North American digital cellular applications is described. Square root raised cosine roll-off prefiltering with a roll-off factor 0.35 is implemented using digital memory circuits. The same memory circuits are used to incorporate predistortion for the nonlinearity of the biphase attenuators. Although predistortion for the modulator only has been incorporated, the same circuit can be used to predistort for power amplifier nonlinearities. The modulator is suitable for silicon monolithic microwave integrated circuit (MMIC) implementation using digital and memory circuits on the same chip. The measured results are presented.<>

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IEEE WESCANEX 93 Communications, Computers and Power in the Modern Environment - Conference Proceedings

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