Overlapping slot transmission using phased arrays
First Claim
1. A time division multiple access (TDMA) base station for preserving across-slot signal continuity of signals transmitted in different directions on a given frequency, comprising:
- a multi-directional antenna for radiating signals;
a processor operatively coupled to the antenna for generating a first data signal for a first time slot of a TDMA frame including a first predetermined symbol pattern and a second predetermined symbol pattern, for generating a second data signal for a second time slot of the TDMA frame including the second predetermined symbol pattern, and for communicating the first data signal and the second data signal to the antenna such that the first data signal is radiated in a first direction and the second data signal is radiated in a second direction; and
wherein the first data signal is modulated at a first phase for transmission in the first time slot at a first power level in the first direction on the given frequency, and the second data signal is modulated at a second phase for transmission in the second time slot at a second power level in the second direction on the given frequency.
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Accused Products
Abstract
A time-division multiple access (TDMA) base station is disclosed for preserving across-slot signal continuity of signals transmitted in different directions on a given frequency. The base station includes a multi-directional antenna for radiating signals. A processor is operatively coupled to the antenna for generating a first data signal for a first time slot of a TDMA frame including a first pre-determined symbol pattern and a second pre-determined symbol pattern, for generating a second data signal for a second time slot of the TDMA frame including the second predetermined symbol pattern, and for communicating the first data signal and the second data signal to the antenna such that the first data signal is radiated in a first direction and the second data signal is radiated in a second direction. The first data signal is modulated at a first phase for transmission in the first time slot at a first power level in the first direction on the given frequency. The second data signal is modulated at a second phase for transmission in the second time slot at a second power level in the second direction on the given frequency.
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Citations
23 Claims
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1. A time division multiple access (TDMA) base station for preserving across-slot signal continuity of signals transmitted in different directions on a given frequency, comprising:
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a multi-directional antenna for radiating signals;
a processor operatively coupled to the antenna for generating a first data signal for a first time slot of a TDMA frame including a first predetermined symbol pattern and a second predetermined symbol pattern, for generating a second data signal for a second time slot of the TDMA frame including the second predetermined symbol pattern, and for communicating the first data signal and the second data signal to the antenna such that the first data signal is radiated in a first direction and the second data signal is radiated in a second direction; and
wherein the first data signal is modulated at a first phase for transmission in the first time slot at a first power level in the first direction on the given frequency, and the second data signal is modulated at a second phase for transmission in the second time slot at a second power level in the second direction on the given frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A time division multiple access (TDMA) cellular base station for transmitting signals in different time slots of a TDMA frame in different directions while preserving across-slot signal continuity as seen by intended receivers, comprising:
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an antenna for forming a plurality of directional beams;
a first signal generator for modulating a first data signal including a first predetermined symbol pattern, first data symbols and a second predetermined symbol pattern on a given radio frequency channel to be radiated during a first time slot at a first power level in a first direction using the antenna, wherein the first signal generator smoothly ramps a first data signal level down from the first power level to zero after transmission of the second predetermined symbol pattern; and
a second signal generator for modulating a second data signal including at least the second predetermined symbol pattern and second data symbols on the given radio frequency channel to be radiated during a second time slot at a second power level in a second direction using the antenna, wherein the first and second time slots overlap during transmissions of the second known symbol pattern and the second signal generator ramps up to a second data signal level from zero to the second power level prior to transmitting the second predetermined symbol pattern. - View Dependent Claims (9, 10, 11)
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12. A method of preserving across-slot signal continuity of signals transmitted in different directions on a given frequency from a time division multiple access (TDMA) base station, comprising the steps of:
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generating a first data signal for a first time slot of a TDMA frame including a first predetermined symbol pattern and a second predetermined symbol pattern;
generating a second data signal for a second time slot including the second predetermined symbol pattern;
modulating the first data signal on the given frequency at a first phase;
modulating the second data signal on the given frequency at a second phase;
transmitting the first data signal from the base station in the first time slot at a first power level in a first direction, on the given frequency at the first phase; and
transmitting the second data signal from the base station in the second time slot at a second power level in a second direction, on the given frequency at the second phase. - View Dependent Claims (13, 14, 15, 16, 17)
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18. In a TDMA cellular base station, a method of transmitting signals in different time slots of a Time Division Multiple Access (TDMA) frame in different directions using a multi-beam directive antenna array while maintaining across-slot signal continuity as seen by intended receivers of the time slots, including the steps of:
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transmitting a first signal in a first direction at a first power level during a first time slot, including transmitting a postamble comprised of predetermined symbols at an end of the first time slot; and
transmitting a second signal in a second direction at a second power level during a second time slot, including transmitting a preamble at a beginning of the second time slot comprised of the predetermined symbols, and overlapping the transmission of the postamble. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification