Synchronized broadcast/multicast communication
First Claim
1. A method comprising:
- spreading, at a base station, non-broadcast content in a first time slot of a transmission with a first spreading code specific to a transmitter of the base station;
spreading broadcast content in a second time slot adjacent to the first time slot in the transmission with a broadcast spreading code common to the transmitter of the base station and at least one other transmitter; and
time-synchronizing with the at least one other transmitter the transmission of the broadcast content spread with the broadcast spreading code common to the transmitter of the base station and the at least one other transmitter.
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Accused Products
Abstract
Synchronized broadcast transmits a same broadcast content using a same waveform from multiple transmitters. Transmitters each apply a same spreading code for broadcast transmissions. In a spread-spectrum communication system having a time division multiplexed forward link, a synchronized broadcast transmission is inserted into a broadcast slot. One embodiment employs an Orthogonal Frequency Divisional Multiplex (OFDM) waveform for the synchronized broadcast. An OFDM receiver is then used to process the received synchronized broadcast transmission. An alternate embodiment implements a broadcast Pseudo-random Noise (PN) code for use by multiple transmitters. An equalizer is then employed to estimate the synchronized broadcast transmission.
70 Citations
12 Claims
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1. A method comprising:
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spreading, at a base station, non-broadcast content in a first time slot of a transmission with a first spreading code specific to a transmitter of the base station; spreading broadcast content in a second time slot adjacent to the first time slot in the transmission with a broadcast spreading code common to the transmitter of the base station and at least one other transmitter; and time-synchronizing with the at least one other transmitter the transmission of the broadcast content spread with the broadcast spreading code common to the transmitter of the base station and the at least one other transmitter. - View Dependent Claims (2, 3, 4)
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5. A receiver comprising:
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means for receiving a transmission from a base station, wherein a first time slot of the transmission includes non-broadcast content and wherein a second time slot adjacent to the first time slot of the transmission includes synchronized broadcast content; and means for decoding the transmission, wherein the non-broadcast content is decoded using a first spreading code specific to a transmitter of the base station and wherein the synchronized broadcast content is decoded using a broadcast spreading code common to the transmitter of the base station and at least one other transmitter.
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6. An apparatus comprising:
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a transmitter configured to transmit a transmission; means for spreading non-broadcast content in a first time slot of the transmission with a first spreading code specific to the transmitter; and means for spreading broadcast content in a second time slot adjacent to the first time slot in the transmission with a broadcast spreading code common to the transmitter and at least one other transmitter; wherein the transmitter is further configured to time-synchronize the transmission of the spread broadcast content with the at least one other transmitter. - View Dependent Claims (7, 8, 9)
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10. A non-transitory computer-readable storage medium including executable instructions executable by a processor to cause the processor to:
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spread non-broadcast content in a first time slot of a transmission with a first spreading code specific to a transmitter of a base station; spread broadcast content in a second time slot adjacent to the first time slot in the transmission with a broadcast spreading code common to the transmitter of the base station and at least one other transmitter; and time-synchronize the transmission of the spread broadcast content with the at least one other transmitter.
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11. A method comprising:
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receiving, from a transmitter of a base station, non-broadcast content in a first time slot of a first transmission, wherein receiving the non-broadcast content includes despreading the non-broadcast content using a first spreading code specific to the transmitter of the base station; and receiving synchronized broadcast content in a second time slot adjacent to the first time slot of the first transmission, wherein receiving the synchronized broadcast content includes despreading the non-broadcast content using a broadcast spreading code common to the transmitter of the base station and a second transmitter. - View Dependent Claims (12)
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Specification