Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Patent
1997-12-24
2000-11-28
Le, Thanh Cong
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
455 69, H04Q 700
Patent
active
061546593
ABSTRACT:
The radiotelephone demodulates the information received from the base station. The symbol-energy-to-noise-density (E.sub.s /N.sub.o) is estimated over a specified duration. This estimate is compared to a target E.sub.s /N.sub.o value. The target is updated periodically in order to maintain the quality of service. If the measured E.sub.s /N.sub.o is greater than the target, the radiotelephone sends a power down command over a reverse power control signaling channel to the base station. If the measured E.sub.s /N.sub.o is less than the target, the radiotelephone sends a power up command to the base station over the same channel. A multi-carrier transceiver system for a code division multiple access system includes circuitry for up-converting processed user data to a plurality of frequency channels. The transceiver, in some embodiments, further includes a plurality of antennas for transmitting each channel of user data. A method of using the multi-carrier system includes processing user data, and then transmitting the data at different frequency channels, and when necessary, transmitting the data through different antennas separated in space and/or having orthogonal polarization.
REFERENCES:
patent: 5257283 (1993-10-01), Gilhousen et al.
patent: 5267262 (1993-11-01), Wheatley, III
patent: 5297161 (1994-03-01), Ling
Jalali Ahmad
Strawczynski Leo
Cong Le Thanh
Crane John D.
Nortel Networks Limited
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