Multiplexing of real time services and non-real time services for OFDM systems
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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
64 Claims
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21. A method of generating pilots in a wireless multiple-input multiple output (MIMO) communication system, comprising:
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obtaining at least one pilot symbol for each antenna of a plurality of antennas;
obtaining an orthogonal sequence for each antenna in the plurality of antennas; and
covering the at least one pilot symbol for each antenna with the orthogonal sequence to obtain a sequence of covered pilot symbols for each antenna to obtain at least one covered pilot symbols for each of the plurality of antennas. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. An wireless communication apparatus comprising:
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a plurality of antennas;
means for obtaining at least one pilot symbol for each antenna in the plurality of antennas;
means for obtaining an orthogonal sequence for each antenna in the plurality of antennas; and
means for covering the pilot symbol for each antenna with the orthogonal sequence to obtain a sequence of covered pilot symbols for the antenna. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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37. An wireless communication apparatus comprising:
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a plurality of antennas;
a plurality of modulators coupled to the plurality of antennas; and
a sit data processor, coupled to the plurality of modulators, that provides a plurality of covered pilot symbol for each antenna, wherein each covered pilot symbol is generated by covering a pilot symbol with an orthogonal sequence. - View Dependent Claims (38, 39, 40, 41, 42, 43)
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44. A method of generating pilots in a wireless multiple-input multiple output (MIMO) communication system, comprising:
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generating at least one pilot symbol for each antenna of a plurality of antennas; and
applying an orthogonal sequence to each pilot symbol for each antenna to obtain orthogonal pilot symbols for each antenna. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51)
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52. An wireless communication apparatus comprising:
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a plurality of antennas;
means for generating at least one pilot symbol for each antenna of a plurality of antennas; and
means for applying an orthogonal sequence to each pilot symbol for each antenna to obtain orthogonal pilot symbols for each antenna. - View Dependent Claims (53, 54, 55, 56, 57, 58)
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59. An wireless communication apparatus comprising:
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a plurality of antennas;
a plurality of modulators coupled to the plurality of antennas; and
a transmit data processor, coupled to the plurality of modulators, tat provides a plurality of orthogonal pilot symbol for each antenna, so that each pilot symbol for each antenna is orthogonal to the pilot symbols of the other antennas. - View Dependent Claims (60, 61, 63, 64)
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Specification