Dual mode radio subscriber unit having a diversity receiver appa

Details Dual mode radio subscriber unit having a diversity receiver appa Dual mode radio subscriber unit having a diversity receiver appa

1995-11-29

1999-08-17

Ghebretinasae, Temesghen

Pulse or digital communications

Receivers

Interference or noise reduction

455133, H04B 710, H04L 102

Patent

active

059404523

ABSTRACT:
A dual mode cellular radiotelephone subscriber unit (802) comprises a diversity receiver (812) and a controller (814). The diversity receiver (812) receives either a first radio frequency (RF) signal (808) modulated by a digital modulation method (805) or a second RF signal (810) modulated by an analog modulation method (807). In one embodiment, the controller (814) controls the diversity receiver (812) responsive to a first diversity algorithm (834) when the diversity receiver (812) receives the first RF signal (808) modulated by the digital modulation method (805), and responsive to a second diversity algorithm (836) when the diversity receiver (812) receives the second RF signal (810) modulated by the analog modulation method (836). In another embodiment, the controller (814) controls the diversity receiver (812) responsive to a first received information set (835) when the diversity receiver (812) receives the first RF signal (808) modulated by the digital modulation method (805), and responsive to a second received information set (837) when the diversity receiver (812) receives the second RF signal (810) modulated by the analog modulation method (807).

REFERENCES:
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patent: 5239541 (1993-08-01), Murai
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patent: 5625874 (1997-04-01), Uchida et al.
TR 45, Mobil Station--Base Station Compatibility, Standard for Dual--Mode Wideband, Spread Spectrum Cellular System, PN-3118, Feb. 11, 1993, pp. i-xxxiv.
Performance of a Two-Branch Radiotelephone Selection Diversity Receiver by Bruce C. Eastmond and James a. Pautler, Motorola, Inc. Chicago Corp. R & D Center, pp. 164-171.
On The Opptimization Of Simple Switch Diversity Receivers by Mario A. Blanco of the IL Inst. of Tech., and Kenneth Zdunck of Motorola Communication Division, Schaumberg, IL.

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