Multiplexing of real time services and non-real time services for OFDM systems
First Claim
1. A transmitter unit for use in a multi-carrier communication system, comprising:
- one or more encoders, each encoder operative to receive and code a respective channel data stream to generate a corresponding coded data stream;
a symbol mapping element coupled to the one or more encoders and operative to receive and map data from one or more coded data streams to generate modulation symbol vectors, wherein each modulation symbol vector includes a plurality of data values used to modulate a plurality of tones to generate an OFDM symbol, wherein the data from each coded data stream is mapped to a respective set of one or more circuits, and wherein each circuit includes a particular set of one or more tones, and further wherein each circuit is specific to a particular service; and
a modulator coupled to the symbol mapping element and operative to receive and modulate the modulation symbol vectors to provide a modulated signal.
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Accused Products
Abstract
Transmitter and receiver units for use in an OFDM communications system and configurable to support multiple types of services. The transmitter unit includes one or more encoders, a symbol mapping element, and a modulator. Each encoder receives and codes a respective channel data stream to generate a corresponding coded data stream. The symbol mapping element receives and maps data from the coded data streams to generate modulation symbol vectors, with each modulation symbol vector including a set of data values used to modulate a set of tones to generate an OFDM symbol. The modulator modulates the modulation symbol vectors to provide a modulated signal suitable for transmission. The data from each coded data stream is mapped to a respective set of one or more “circuits”. Each circuit can be defined to include a number of tones from a number of OFDM symbols, a number of tones from a single OFDM symbol, all tones from one or more OFDM symbols, or some other combination of tones. The circuits can have equal size or different sizes. Different circuits can be used for full rate data (e.g., active speech) and low rate data (e.g., silence periods).
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Citations
31 Claims
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1. A transmitter unit for use in a multi-carrier communication system, comprising:
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one or more encoders, each encoder operative to receive and code a respective channel data stream to generate a corresponding coded data stream; a symbol mapping element coupled to the one or more encoders and operative to receive and map data from one or more coded data streams to generate modulation symbol vectors, wherein each modulation symbol vector includes a plurality of data values used to modulate a plurality of tones to generate an OFDM symbol, wherein the data from each coded data stream is mapped to a respective set of one or more circuits, and wherein each circuit includes a particular set of one or more tones, and further wherein each circuit is specific to a particular service; and a modulator coupled to the symbol mapping element and operative to receive and modulate the modulation symbol vectors to provide a modulated signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A transmitter unit for use in a multi-carrier communication system, comprising:
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one or more encoders, each encoder operative to receive and code a respective channel data stream to generate a corresponding coded data stream; a symbol mapping element coupled to the one or more encoders and operative to receive and map data from one or more coded data streams to generate modulation symbol vectors, wherein each modulation symbol vector includes a plurality of data values used to modulate a plurality of tones to generate an OFDM symbol, wherein the data from each coded data stream is mapped to a respective set of one or more circuits, and wherein each circuit includes a respective set of one or more tones and further wherein each circuit is specific to a particular service; an inverse Fourier transform coupled to the symbol mapping element and operative to receive the modulation symbol vectors and generate a time-domain representation of each modulation symbol vector to provide a corresponding OFDM symbol; a cyclic prefix generator coupled to the inverse Fourier transform and operative to repeat a portion of each OFDM symbol to generate a corresponding transmission symbol; and an upconverter coupled to the cyclic prefix generator and operative to modulate transmission symbols to generate the modulated signal; and
wherein transmissions for the one or more channel data streams occurs over slots, wherein each slot includes a plurality of OFDM symbols, and wherein full rate data for a particular channel data stream is transmitted via a first circuit and lower rate data is transmitted via a second circuit.
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28. A method for generating and transmitting a modulated signal, comprising:
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receiving one or more channel data streams; coding each channel data stream with a particular coding scheme to generate a corresponding coded data stream; mapping data from one or more coded data streams to generate modulation symbol vectors, wherein each modulation symbol vector includes a plurality of data values used to modulate a plurality of tones to generate an OFDM symbol, wherein the data from each coded data stream is mapped to a respective set of one or more circuits, and wherein each circuit includes a particular set of one or more tones and further wherein each circuit is specific to a particular service; and modulating the modulation symbol vectors to provide a modulated signal. - View Dependent Claims (29, 30)
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31. A receiver unit comprising:
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an antenna operative to receive a modulated signal; a front end processor coupled to the antenna and operative to process the received signal to generate samples; a Fourier transform coupled to the front end processor and operative to receive samples from the front end processor and generate transformed representations of the samples; a processor coupled to the Fourier transform and operative to process the transformed representations to generate at a symbol stream corresponding to a particular transmission being processed; and a decoder coupled to the processor and operative to receive and decode the symbol stream to generate decoded data; wherein the modulated signal is generated by coding one or more channel data streams with a particular coding scheme to generate one or more coded data streams, mapping data from the one or more coded data streams to generate modulation symbol vectors, and modulating the modulation symbol vectors to provide a modulated signal, and wherein each modulation symbol vector includes a plurality of data values used to modulate a plurality of tones to generate an OFDM symbol, wherein the data from each coded data stream is mapped to a respective set of one or more circuits, and wherein each circuit includes a respective set of one or more tones and further wherein each circuit is specific to a particular service.
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Specification