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US 2001/0034872 A1Published application
Digital broadcasting system and method
AssigneeITT Manufacturing Enterprises, Inc.
InventorJoseph Smallcomb
Life of this patent
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AssigneeITT Manufacturing Enterprises, Inc.
InventorJoseph Smallcomb
Estimating the term…
Apparatus and method of achieving diversity in reception of plural digital broadcast signals. A stream of a complete set of code bits is generated from one or more sources of data bits. A first Critical Subset of code bits is chosen or selected for a first channel (e.g. a specified puncturing pattern is applied to the stream of a complete set of code sets). A second (e.g. alternative) Critical Subset of code bits is chosen or selected for a second channel (e.g. a second or alternative puncturing pattern is chosen for the second channel). Further alternative Critical Subsets may be chosen for any additional channels. All the channels are transmitters, some can incorporate time delay to achieve temporal diversity. Moreover, the order of transmitting the code bits on each channel can be different (for example, the interleaving depths can be different). At the receiver, the stream of Critical Subsets of code bits for all of the channels are simultaneously received and a reconstruction of a complete set of code bits accomplished and the reconstructed code and may be inserted into a single Viterbi decoder. Various weighting functions and reconstruction algorithms are disclosed.
In a digital radio broadcast system having transmitter broadcasting a string of encoded information bits over a plurality of channels, the improvement comprising means for decomposing a complete set of code of said encoded information bits into two or more different Critical Subsets of code bits and transmitting said critical subsets of code bits on different ones of said channels.
A method of digitally transmitting information bits from one or more sources over multiple channels, comprising:
A digital radio receiver for receiving a plurality of channels of a digital radio broadcast wherein each channel includes a set of digitally encoded information which has been decomposed into a plurality of Critical Subsets of code bits, there being a different Critical Subset of code bits transmitted in each channel, respectively, said digital radio receiver having means for simultaneously receiving the stream of Critical Subsets for all of the channels and means for reconstructing therefrom a complete set of code bits.
In a digital radio broadcast system in which a string of encoded digital information bits is commonly supplied to a plurality of radio broadcasting channels, the improvement wherein each channel includes means to puncture the encoded data supplied to it, each said means to puncture having a different puncture pattern supplied thereto to achieve code diversity in the encoded data broadcast by each broadcast channel, respectively.
In a digital radio broadcast system in which digital information bits are encoded by a convolutional encoder and commonly supplied to a plurality of radio broadcast channels, each broadcast channel having means to puncture the convolutionally encoded data supplied to it, the improvement wherein each said means to puncture having a different puncturing pattern supplied thereto to achieve code diversity in the encoded data broadcast by each broadcast channel, respectively.
A digital broadcast radio receiver for simultaneously receiving at least two of said plurality of radio broadcast channels, means to deconvolute and depuncture the received encoded data and output a single set of encoded data to a utilization device.
Dependencies are inferred from the claim text.