Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1996-11-05
1998-12-15
Marcelo, Melvin
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370342, 375200, H04J 1300
Patent
active
058503935
ABSTRACT:
A transmitter receiver implementing both frequency division duplex and time division duplex in one device in a CDMA mobile communication system. In the FDD mode, data in an interleave memory in an interleaver is read at a predetermined read rate V.sub.R =V.sub.N, where V.sub.N is a normal rate. In the TDD mode, a transmitting carrier frequency is set identical to a receiving carrier frequency, and the read rate V.sub.R of the interleave memory and the write rate V.sub.W of the deinterleave memory are set at V.sub.R =V.sub.W >2V.sub.N. The transfer rate V.sub.T from column to column of the memories are set identical in the FDD mode and the TDD mode. This makes it possible to create a vacant duration while transferring from column to column, and to perform reception or transmission during the vacant duration. The remaining operation of the TDD mode is the same as the operation of the FDD mode.
REFERENCES:
patent: 5689502 (1997-11-01), Scott
patent: 5689511 (1997-11-01), Shimazaki et al.
patent: 5715236 (1998-02-01), Gilhousen et al.
Technical Report of IEICE B-II, vol. J72-B-II pp. 7-15 S. Sampei, "Fading Compensation for 16QAM in Land Mobile Communications", Jan., 1989.
IEEE Transactions on Vehicular Technology vol. 42, No. 2 Seiichi Sampei and Terumi Sunaga "Rayleigh Fading Compensation for QAM in Land Mobile Radio Communications", May, 1993.
Marcelo Melvin
NTT Mobile Communications Network Inc.
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