Transmitting station for wireless telephone system with diversity transmission and method
First Claim
1. In a wireless terrestrial code division multiple access (CDMA) communication system, wherein a synchronization code is communicated from a transmitting station to a subscriber station in a predetermined time frame format comprising a plurality of sequential time slots per time frame, a method at the transmitting station comprising:
- transmitting a first signal corresponding to the synchronization code in a synchronization channel in a first time slot of the predetermined time frame format from a first antenna; and
transmitting a second signal corresponding to the synchronization code in the synchronization channel in a second time slot of the predetermined time frame format from a second antenna spaced apart from the first antenna, the second time slot occurring after the first time slot relative to the predetermined time frame format.
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Accused Products
Abstract
A transmitting station for communicating data in a cellular system utilizes transmission diversity by transmitting a plurality of signals. A transmitter is configured to transmit at least a first data signal corresponding to the data in a first time slot and to transmit a second data signal corresponding to the data in a second time slot. The second time slot occurs after the first time slot so that the first and second transmitted data signals are not simultaneously transmitted. Preferably, the transmitter includes a first antenna from which the first data signal is transmitted and a second antenna spaced apart from the first antenna from which the second data signal is transmitted. Where the transmitting station is for a CDMA system, the transmitter is configured to transmit said data signals as PN spread spectrum signals. In such case, an encoder is provided for spreading and modulating the data with PN codes to form the data signals. Preferably, different PN codes are used to form the data signals. In one embodiment, the PN codes are part of a PN code sequence produced by a PN code generator without resetting. The transmitting station may be a combined base station and transfer station.
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Citations
78 Claims
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1. In a wireless terrestrial code division multiple access (CDMA) communication system, wherein a synchronization code is communicated from a transmitting station to a subscriber station in a predetermined time frame format comprising a plurality of sequential time slots per time frame, a method at the transmitting station comprising:
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transmitting a first signal corresponding to the synchronization code in a synchronization channel in a first time slot of the predetermined time frame format from a first antenna; and transmitting a second signal corresponding to the synchronization code in the synchronization channel in a second time slot of the predetermined time frame format from a second antenna spaced apart from the first antenna, the second time slot occurring after the first time slot relative to the predetermined time frame format. - View Dependent Claims (2)
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3. In a wireless terrestrial code division multiple access (CDMA) communication system, wherein a synchronization code is sent from a transmitting station to a subscriber station in a predetermined time frame format comprising a plurality of sequential time slots per time frame, a method at said transmitting station comprising:
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transmitting a first signal corresponding to the synchronization code in a synchronization channel in a first time slot of the predetermined time frame format from a first antenna; and transmitting a second signal corresponding to the synchronization code in the synchronization channel in a second time slot of the predetermined time frame format from a second antenna spaced apart from the first antenna, the second time slot occurring after the first time slot relative to the predetermined time frame format.
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4. In a wireless terrestrial code division multiple access (CDMA) communication system, wherein control data is communicated from a transmitting station to a plurality of subscriber stations in a common control channel, a method comprising:
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transmitting a first control data signal having first data over the common control channel from a first antenna from the transmitting station; and transmitting a second control data signal having the first data processed and sent over the common control channel from a second antenna from the transmitting station spatially diverse from the first antenna; wherein at least one symbol of the first data is transmitted as an at least one corresponding symbol at a different time on the second antenna; wherein a spreading sequence for spreading the at least one symbol transmitted on the first antenna is continued for spreading the corresponding at least one symbol on the second antenna. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A code division multiple access (CDMA) transmitting station for communicating data in a terrestrial cellular system that utilizes transmission diversity comprising a transmitter configured to transmit a first data sequence over a common control channel on a first antenna and to transmit a second data sequence over the common control channel on a second antenna, the second data sequence having the first data sequence processed;
- wherein at least one symbol of the first data is transmitted as an at least one corresponding symbol at a different time on the second antenna;
wherein a spreading sequence for the at least one symbol transmitted on the first antenna is continued for the spreading the corresponding at least one symbol on the second antenna;
wherein the second antenna spaced apart from the first antenna. - View Dependent Claims (13, 19, 20, 21)
- wherein at least one symbol of the first data is transmitted as an at least one corresponding symbol at a different time on the second antenna;
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12. A code division multiple access (CDMA) transmitting station for communicating a synchronization code in a predetermined time frame format comprising a plurality of sequential time slots per time frame in a terrestrial cellular system that utilizes transmission diversity comprising a transmitter configured to transmit a first signal corresponding to the synchronization code in a first time slot of the predetermined time frame format in a synchronization channel and to transmit a second signal corresponding to the synchronization code in a second time skt of the predetermined time frame format in the synchronization channel, the second time slot occurring after the first time slot relative to the time frame format wherein the transmitter indudes a first antenna from which the first signal is transmitted and a second antenna spaced apart from the first antenna from which the second signal is transmitted.
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14. A transmitting station for communicating data in a cellular system that utilizes transmission diversity comprising a transmitter configured to transmit a first control data signal having first data over a common control channel and to transmit a second control data signal having the first data processed and sent over the common control channel from a second antenna spatially diverse from the first antenna and at least one symbol transmitted on the first antenna is transmitted as an at least one corresponding symbol at a different time on the second antenna;
- wherein a spreading sequence for spreading the at least one symbol transmitted on the first antenna continues for spreading the corresponding at least one symbol on the second antenna.
- View Dependent Claims (15, 16, 17, 18)
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22. A code division multiple access (CDMA) subscriber station, the CDMA subscriber station comprising:
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a receiver configured to receive a first signal during a first one of a plurality of time slots and a second signal during a second one of the plurality of time slots, the first signal carrying a first sequence including a bit sequence combined with a first code sequence, and the second signal carrying synchronization information and a second sequence, the second sequence including the bit sequence combined with a second code sequence, wherein the plurality of time slots are included in a frame, the first and second signals being transmitted by respective first and second ones of a plurality of antennas, the plurality of antennas being associated with a transmitting station, and the receiver is configured to diversity combine diversity transmitted data of a CDMA control channel by utilizing first information derived from the first and second signals; and a controller configured to derive second information associated with the transmitting station, the synchronization information and the CDMA control channel being transmitted by the plurality of antennas of the transmitting station. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method comprising:
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receiving, with a code division multiple access (CDMA) subscriber station, a first signal during a first one of a plurality of time slots and a second signal during a second one of the plurality of time slots, the second signal carrying synchronization information, the plurality of time slots being included in a frame, and the first and second signals being transmitted by respective first and second ones of a plurality of antennas, the plurality of antennas being associated with a transmitting station; detecting a first sequence carried by the first signal and a second sequence carried by the second signal, the first sequence being derived from a common bit sequence and the second sequence being derived from the common bit sequence; diversity combining diversity transmitted data, the diversity transmitted data being carried by a CDMA control channel, said diversity combining utilizing first information derived from the first and second signals; and deriving second information associated with the transmitting station, the synchronization information and the CDMA control channel being transmitted by the plurality of antennas of the transmitting station. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42)
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43. A code division multiple access (CDMA) subscriber station comprising:
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a receiver configured to receive a first synchronization code sequence during a first one of a plurality of time slots and a second synchronization code sequence during a second one of the plurality of time slots, the first and second synchronization code sequences being derived from a bit sequence, the plurality of time slots being included in a frame, the first and second synchronization code sequences being associated with a synchronization channel; the receiver being further configured to diversity combine diversity transmitted data of a CDMA control channel, said diversity combining utilizing first information derived from the first and second synchronization code sequences, the CDMA channel and the synchronization channel being transmitted by a plurality of antennas associated with a base station; and a controller configured to derive second information associated with the base station, and wherein the base station transmits the first or second synchronization code sequence from respective first and second ones of the plurality of antennas. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. A spread spectrum receiver for use in a spread spectrum subscriber station, the spread spectrum receiver being configured to receive a common control channel transmitted from a base station, the base station including a plurality of first antennas, said spread spectrum receiver comprising:
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a second antenna for receiving a spread-spectrum signal; a detection circuit configured to detect a synchronization code over a plurality of time slots, within the spread spectrum signal carrying the synchronization code; and a synchronization and timing controller configured to synchronize a common control channel processing circuit in response to the detected synchronization code; the common control channel processing circuit comprising; a code generator configured to generate a local copy of a spreading code associated with the common control channel; a correlator configured to despread the received spread spectrum signal to generate a despread output, the correlator using the local copy of the spreading code, as a despread spread spectrum signal; and a combiner configured to receive the despread output and to combine the despread output with a delayed version of the of the despread output as common control channel symbols. - View Dependent Claims (56, 57, 58, 59, 60)
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61. A code division multiple access (CDMA) subscriber station for use in a spread spectrum system, the CDMA subscriber station being configured to receive signals transmitted from a base station, the CDMA subscriber station comprising:
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an antenna for receiving a spread spectrum signal over a plurality of time slots; a detecting circuit configured to detect a plurality of synchronization codes, the synchronization codes being carried by the spread spectrum signal, each of the plurality of synchronization codes being associated with a corresponding one of the plurality of time slots; a synchronization and timing controller configured to synchronize a common control channel processing circuit in response to the detected plurality of synchronization codes; the common control channel processing circuit comprising; a CDMA receiver configured to despread the received spread spectrum signal with a spreading code associated with the common control channel and generate a despread output; and a combiner configured to receive the produced despread output with a delayed version of the despread output as conunon control channel symbols. - View Dependent Claims (62, 63, 64)
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65. A method for receiving a code division multiple access (CDMA) signal at a subscriber station, the CDMA signal being transmitted from a base station, the method comprising:
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receiving a spread spectrum signal over a plurality of time slots; detecting a plurality of synchronization codes, the synchronization codes being carried by the spread spectrum signal, each of the plurality of synchronization codes being associated with a corresponding one of the plurality of time slots; and synchronizing processing of a diversity transmitted common control channel in response to the detected plurality of synchronization codes; the processing of the diversity transmitted common control channel comprising; despreading the received spread spectrum signal to generate an output despread signal; and combining the output despread signal with a delayed version of the output despread signal as common control channel symbols. - View Dependent Claims (66)
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67. A wireless code division multiple access (CDMA) subscriber station for use in a terrestrial wireless code division multiple access communication system, the subscriber station comprising:
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a receiver that receives a diversity transmitted synchronization channel, the diversity transmitted synchronization channel carrying a plurality of synchronization codes, each of the plurality of synchronization codes being associated with a corresponding one of a plurality of time slots, the receiver being configured to detect the plurality of synchronization codes, and wherein the receiver despreads a diversity transmitted common control channel with a corresponding CDMA code, the despread common control channel carrying symbols; a diversity combiner that combines the symbols of the despread common control channel with symbols associated with a delayed version of the despread common control channel to produce combined symbols of tho common control channel; and a synchronization controller that controls the receiver and the diversity combiner so that diversity combining of the diversity transmitted common control channel is facilitated.
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68. In a code division multiple access (CDMA) cellular system that utilizes transmission diversity by transmitting a plurality of data signals in a predetermined time frame format comprising a plurality of sequential time slots per time frame, a method for receiving data from a transmitting station by a receiving station comprising:
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receiving a first signal from a first antenna of a first transmitting station corresponding to at least one synchronization symbol data in a first time slot of the time frame format; receiving a second signal from a second antenna of said first transmitting station corresponding to the same at least one synchronization symbol in a second time slot of the time frame format, said second time slot occurring after said first time slot relative to the time frame format; and utilizing the received first and second data signal to synchronize the receiving station to the transmitting station. - View Dependent Claims (69)
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70. A receiving station for a code division multiple access (CDMA) cellular system that utilizes transmission diversity, a plurality signals being transmitted in the CDMA cellular system, each of the plurality of signals being in a predetermined time frame format, the predetermined time frame format comprising sequential time slots and a plurality of frames, each of the plurality of frames being associated with at least one of the time slots, the plurality of signals for communicating data, the receiving station comprising:
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a receiver configured to receive a first one of the plurality of signals from a first antenna of a first transmitting station, the first one of the plurality of signals carrying at least one synchronization symbol in a first one of the time slots, and the receiver is also configured to receive a second one of the plurality of signals from a second antenna of said first transmitting station, the second one of the plurality of signals carrying the at least one synchronization symbol in a second one of the time slots, said second one of the time slots occurring after said first one of the time slots relative to the time frame format, and said receiver is configured to utilize the first and second ones of the plurality of signals to facilitate communication with said first transmitting station, the first and second ones of the plurality of signals facilitating reception, by said receiver, of a diversity transmitted common control channel. - View Dependent Claims (71, 72, 73, 74, 75, 76, 77, 78)
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Specification