Direct-sequence spread spectrum communication system, a primary radio station, and a secondary radio station
First Claim
1. A direct-sequence spread spectrum communication system comprising at least one primary radio station and a plurality of secondary radio stations, the primary radio station and the secondary radio stations being arranged for communication with each other via control channels and traffic channels, characterized in that at least in a cell at least a majority of the channels share at least one long pseudo-noise sequence, generated by at least one linear feedback shift register, the channels being distinguishable within the at least one long pseudo-noise sequence, and in that for locking on a current channel using a long pseudo-noise sequence, a phase of the current channel within the long pseudo-noise sequence at receiver side is derived from state information about the linear feedback shift register transmitted via a control channel.
3 Assignments
0 Petitions
Accused Products
Abstract
Known are direct-sequence spread spectrum systems (1) such as CDMA mobile radio systems applying short pseudo-noise sequences for encoding and decoding of data. A DS-SS communication system is provided in which less pseudo-noise sequences are used while at the same time providing efficient locking at the receiver side. To this end, a majority of the channels (BCH, PCH, AGCH, TCH, ACCH) in a cell (Z1, Z2) of a mobile radio system (1) share one long pseudo-noise sequence (PNL). At reception side, in a mobile radio station (MS1, MS2) or the like, efficient calculation of current sequence phases for current received channels is achieved by applying vector-matrix calculations to a received sequence state (xi) and received sequence offset (ofset) that are transmitted by a base station (BS1, BS2). The vector-matrix calculations apply precalculated and stored sequence offset transformation matrices (A).
14 Citations
9 Claims
- 1. A direct-sequence spread spectrum communication system comprising at least one primary radio station and a plurality of secondary radio stations, the primary radio station and the secondary radio stations being arranged for communication with each other via control channels and traffic channels, characterized in that at least in a cell at least a majority of the channels share at least one long pseudo-noise sequence, generated by at least one linear feedback shift register, the channels being distinguishable within the at least one long pseudo-noise sequence, and in that for locking on a current channel using a long pseudo-noise sequence, a phase of the current channel within the long pseudo-noise sequence at receiver side is derived from state information about the linear feedback shift register transmitted via a control channel.
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7. A primary radio station for use in a direct-sequence spread spectrum communication system, which primary station comprises means for communicating with a plurality of secondary radio stations via control channels and traffic channels, characterized in that for at least a majority of the channels the primary station shares at least one long pseudo-noise sequence, generated by at least one linear feedback shift register, the channels being distinguishable within the at least one pseudo-noise sequence, and in that the primary station is arranged for transmitting state information about the linear feedback shift register to the secondary stations via a control channel, the primary station using a short pseudo-noise sequence for encoding the state information so that the secondary station can decode received data in a current channel using the long pseudo-noise sequence.
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8. A secondary radio station for use in a direct-sequence spread spectrum system, which secondary radio station comprises means for communicating with a primary radio station via control channels and traffic channels, characterized in that the secondary radio station is arranged for receiving from the primary station at least a majority of the channels using at least one long pseudo-noise sequence generated by at least one linear feedback shift register, the channels being distinguishable within the at least one pseudo-noise sequence, and in that the secondary radio station is arranged for locking on a current channel using the long pseudo-noise sequence by deriving a phase of the current channel from state information about the linear feedback shift register received from the primary station via a control channel.
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9. A direct sequence spread spectrum communication system comprising at least one primary radio station and a plurality of secondary stations, the primary and secondary stations being configured to communicate with each other via control channels and traffic channels, in which system the at least one primary station is configured to generate at least one long pseudo-noise sequence for shared use by at least a majority of the control and traffic channels, and to transmit state information of a current channel represented by a part of the long pseudo-noise sequence to the secondary radio stations, the secondary radio stations being configured to distinguish channels represented by different parts of the long pseudo-noise sequence using the state information received from the secondary radio station.
Specification