Compression of baseband signals in base transceiver system radio units
First Claim
1. A radio for transmitting and receiving an RF signal including a plurality of antenna-carrier channels, comprising:
- an interface 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) and quadrature (Q) signal samples for a plurality of baseband antenna-carrier channels of a wireless communication network;
logic 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 arranged to compress I and Q signal samples of the plurality of baseband antenna-carrier channels to provide the outgoing sequences of compressed I and Q signal samples, and arranged to decompress the incoming sequences of compressed I and Q signal samples to provide decompressed I and Q signal samples of the plurality of baseband antenna-carrier channels;
an upconverter arranged to upconvert the incoming sequences of decompressed I and Q signal samples for the respective baseband antenna-carrier channels to form digital samples of a plurality of antenna-carrier channels;
a downconverter arranged to downconvert digital samples of a received RF signal to produce I and Q signal samples of the plurality of baseband antenna-carrier channels; and
a transducer arranged to convert the digital samples of the plurality of antenna-carrier channels to an analog RF signal, and to convert the received analog RF signal to the digital samples of antenna-carrier channels.
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Accused Products
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
31 Claims
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1. A radio for transmitting and receiving an RF signal including a plurality of antenna-carrier channels, comprising:
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an interface 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) and quadrature (Q) signal samples for a plurality of baseband antenna-carrier channels of a wireless communication network; logic 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 arranged to compress I and Q signal samples of the plurality of baseband antenna-carrier channels to provide the outgoing sequences of compressed I and Q signal samples, and arranged to decompress the incoming sequences of compressed I and Q signal samples to provide decompressed I and Q signal samples of the plurality of baseband antenna-carrier channels; an upconverter arranged to upconvert the incoming sequences of decompressed I and Q signal samples for the respective baseband antenna-carrier channels to form digital samples of a plurality of antenna-carrier channels; a downconverter arranged to downconvert digital samples of a received RF signal to produce I and Q signal samples of the plurality of baseband antenna-carrier channels; and a transducer arranged to convert the digital samples of the plurality of antenna-carrier channels to an analog RF signal, and to convert the received analog RF signal to the digital samples of antenna-carrier channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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sampling and downconverting an RF signal including a plurality of antenna-carrier channels to generate a plurality of sequences of in-phase (I) and quadrature (Q) signal samples representing a 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 (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. 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) and quadrature (Q) signal samples for a plurality of baseband antenna-carrier channels of a wireless communication network for a plurality of subscriber signals; 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; 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; upconverting the sequences of I and Q signal samples for the respective baseband antenna-carrier channels to form digital samples of a plurality of antenna-carrier channels; and transducing the digital samples of the plurality of antenna-carrier channels to an RF signal carrying the plurality of subscriber signals. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
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Specification