Compression of baseband signals in base transceiver system interfaces
First Claim
1. A method, comprising:
- receiving a plurality of sequences of in-phase (I) sample and quadrature (Q) signal samples of a corresponding plurality of baseband antenna-carrier channels of a wireless communication network;
compressing the plurality of sequences of I and Q signal samples to form compressed I and Q signal samples for the plurality of baseband antenna-carrier channels;
combining the compressed I and Q signal samples for the plurality of baseband antenna-carrier channels into data structures for a serial data stream; and
transmitting data structures for a serial data stream on a serial data link.
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Abstract
A signal compression method and apparatus for a base transceiver system (BTS) in a wireless communication network provides efficient transfer of compressed signal samples over serial data links in the system. For the uplink, an RF unit of the BTS compresses baseband signal samples resulting from analog to digital conversion of a received analog signal followed by digital downconversion. The compressed signal samples are transferred over the serial data link to the baseband processor then decompressed prior to normal signal processing. For the downlink, the baseband processor compresses baseband signal samples and transfers the compressed signal samples to the RF unit. The RF unit decompresses the compressed samples prior to digital upconversion and digital to analog conversion to form an analog signal for transmission over an antenna. Compression and decompression can be incorporated into operations of conventional base stations and distributed antenna systems, including OBSAI or CPRI compliant systems.
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Citations
29 Claims
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1. A method, comprising:
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receiving a plurality of sequences of in-phase (I) sample and quadrature (Q) signal samples of a corresponding plurality of baseband antenna-carrier channels of a wireless communication network; compressing the plurality of sequences of I and Q signal samples to form compressed I and Q signal samples for the plurality of baseband antenna-carrier channels; combining the compressed I and Q signal samples for the plurality of baseband antenna-carrier channels into data structures for a serial data stream; and transmitting data structures for a serial data stream on a serial data link. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, comprising:
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receiving, on a serial data link, a serial data stream including a sequence of data structures, at least some of the data structures in the sequence holding compressed in-phase (I) sample and quadrature (Q) signal samples for a plurality of baseband antenna-carrier channels of a wireless communication network; disassembling the sequence of data structures to recover a plurality of sequences of compressed I and Q signal samples corresponding to the plurality of baseband antenna-carrier channels; and decompressing the recovered plurality of sequences of compressed I and Q signal samples to form sequences of I and Q signal samples for respective baseband antenna-carrier channels of the plurality of baseband antenna-carrier channels. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A transceiver for a bi-directional serial data channel carrying serial data streams including corresponding incoming and outgoing sequences of data structures, at least some of the data structures in the sequence holding compressed in-phase (I) sample and quadrature (Q) signal samples for a plurality of baseband antenna-carrier channels of a wireless communication network, comprising:
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logic, within the transceiver, coupled to assemble the outgoing sequences of data structures from a plurality of sequences of compressed I and Q signal samples corresponding to the plurality of baseband antenna-carrier channels, and to disassemble the incoming sequences of data structures, to recover a plurality of sequences of compressed I and Q signal samples corresponding to the plurality of baseband antenna-carrier channels; and compression and decompression logic, within the transceiver, arranged to compress I and Q signal samples of the plurality of baseband antenna-carrier channels to provide the sequences of compressed I and Q signal samples for outgoing sequences, and arranged to decompress the sequences of compressed I and Q signal samples to provide decompressed I and Q signal samples of the plurality of baseband antenna-carrier channels for incoming sequences. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification