Title :
Improved modulation techniques for wireless communications: raised cosine filtered FQPSK-FQPSK(RC)
Author :
Yan, Hongying ; Feher, Kamilo
Author_Institution :
Digital Wireless Commun. Lab., California Univ., Davis, CA, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
An improved spectrally efficient modem scheme is proposed for wireless communications. This new scheme is based on nonlinear base band processor, with additional filtering to reduced the spectral spreading. Its spectral efficiency is improved up to 20%, comparing with GMSK. Additional filtering is a square root of raised cosine filter with a varying between 0.2 and 0.5. The performance of this technique has been evaluated in both AWGN and Rayleigh fading channels. This new spectral efficient modem is as robust as GMSK in interference limited fading environment and increases the capacity 20%
Keywords :
Gaussian channels; Rayleigh channels; cellular radio; channel capacity; fading; filtering theory; modems; quadrature phase shift keying; radio equipment; radiofrequency interference; signal processing; spectral analysis; AWGN channels; GMSK; Rayleigh fading channels; capacity; cellular environment; filtering; interference limited fading environment; modem; modulation techniques; nonlinear baseband processor; performance; raised cosine filtered FQPSK; spectral efficiency; spectral spreading reduction; square root; wireless communications; AWGN; Band pass filters; Bit error rate; Degradation; Frequency; Low pass filters; Modems; Quadrature phase shift keying; Transfer functions; Wireless communication;
Journal_Title :
Broadcasting, IEEE Transactions on
