Multiplexing of real time services and non-real time services for OFDM systems
First Claim
1. A method of transmitting in a multi-antenna communication system, comprising:
- modulating a plurality of signals to be transmitted from each antenna of a plurality of antennas with at least one subband of a different one of a plurality of groups of subbands, wherein each of the plurality of groups includes a different subset of the plurality of subbands and wherein the plurality of subbands of a first group are noncontiguous; and
transmitting at least some the plurality of signals substantially simultaneously from different ones of the plurality of antennas.
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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).
160 Citations
20 Claims
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1. A method of transmitting in a multi-antenna communication system, comprising:
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modulating a plurality of signals to be transmitted from each antenna of a plurality of antennas with at least one subband of a different one of a plurality of groups of subbands, wherein each of the plurality of groups includes a different subset of the plurality of subbands and wherein the plurality of subbands of a first group are noncontiguous; and
transmitting at least some the plurality of signals substantially simultaneously from different ones of the plurality of antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A base station comprising:
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a plurality of transmit antennas;
a first processor configured to instruct a plurality of pilot symbols to be transmitted from the plurality of transmit antennas with one subset of a plurality of sub-channel subsets, wherein each subset comprises sub-channels that are noncontiguous and includes different ones of the plurality of sub-channels; and
a plurality of modulators, each modulator coupled to the first processor and to at least one of the plurality of transmit antennas, configured to modulate the plurality of pilot symbols with the appropriate sub-channels of the one subset of the plurality of sub-channel subsets. - View Dependent Claims (9, 10, 11, 12, 13)
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14. An apparatus in a multi-antenna communication system, comprising
means for modulating a plurality of signals to be transmitted from each antenna of a plurality of antennas with at least one subband of a different one of a plurality of groups of subbands, wherein each of the plurality of groups includes a different subset of the plurality of subbands and wherein the plurality of subbands of a first group are noncontiguous; - and
means for transmitting at least some the plurality of signals substantially simultaneously from different ones of the plurality of antennas. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification