Transmission of signaling in an OFDM-based system
First Claim
1. An apparatus in a wireless communication system utilizing orthogonal frequency division multiplexing (OFDM), comprising:
- a signaling modulator operable to spread signaling data over M frequency subbands used for signaling transmission, the M frequency subbands being selected from among N frequency subbands usable for transmission, where M and N are each greater than one and M is less than or equal to N;
a data modulator operable to map data symbols onto L frequency subbands used for data transmission, where L is one or greater and is less than or equal to N; and
a combiner operable to combine outputs of the signaling modulator and the data modulator.
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Abstract
Techniques for efficiently transmitting various types of signaling on the forward and reverse links in an OFDM-based system are described. Instead of specifically allocating subbands to individual signaling channels, signaling data for a signaling channel on a given link is sent as “underlay” to other transmissions that may be sent on the same link. Each wireless terminal is assigned a different PN code. The signaling data for each terminal is spectrally spread over all or a portion of the system bandwidth using the assigned PN code. For the reverse link, a wireless terminal may transmit signaling on all N usable subbands and may transmit traffic data on L subbands assigned for data transmission, which may be a subset of the N usable subbands. For the forward link, a base station may transmit signaling and traffic data for all terminals on the N usable subbands.
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Citations
57 Claims
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1. An apparatus in a wireless communication system utilizing orthogonal frequency division multiplexing (OFDM), comprising:
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a signaling modulator operable to spread signaling data over M frequency subbands used for signaling transmission, the M frequency subbands being selected from among N frequency subbands usable for transmission, where M and N are each greater than one and M is less than or equal to N;
a data modulator operable to map data symbols onto L frequency subbands used for data transmission, where L is one or greater and is less than or equal to N; and
a combiner operable to combine outputs of the signaling modulator and the data modulator. - 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, 27, 28, 29)
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30. A method of transmitting data and signaling in a wireless communication system utilizing orthogonal frequency division multiplexing (OFDM), comprising:
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spreading signaling data over M frequency subbands used for signaling transmission, the M frequency subbands being selected from among N frequency subbands usable for transmission, where M and N are each greater than one and M is less than or equal to N;
mapping data symbols onto L frequency subbands used for data transmission, where L is one or greater and is less than or equal to N; and
processing the spread signaling data on the M frequency subbands and the mapped data symbols on the L frequency subbands to generate output chips. - View Dependent Claims (31, 32, 33)
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34. An apparatus in a wireless communication system utilizing orthogonal frequency division multiplexing (OFDM), comprising:
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means for spreading signaling data over M frequency subbands used for signaling transmission, the M frequency subbands being selected from among N frequency subbands usable for transmission, where M and N are each greater than one and M is less than or equal to N;
means for mapping data symbols onto L frequency subbands used for data transmission, where L is one or greater and is less than or equal to N; and
means for processing the spread signaling data on the M frequency subbands and the mapped data symbols on the L frequency subbands to generate output chips. - View Dependent Claims (35, 36, 37)
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38. An apparatus in a wireless communication system utilizing orthogonal frequency division multiplexing (OFDM), comprising:
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an OFDM demodulator operable to perform demodulation on received samples and provide received symbols; and
a signaling demodulator operable to perform despreading on the received samples or received symbols for M frequency subbands used for signaling transmission and provide detected signaling data, wherein signaling data is spread across the M frequency subbands prior to transmission, and wherein the M frequency subbands are selected from among N frequency subbands usable for transmission, where M and N are each greater than one and M is less than or equal to N. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. A method of receiving data and signaling in a wireless communication system utilizing orthogonal frequency division multiplexing (OFDM), comprising:
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performing demodulation on received samples to obtain received symbols; and
despreading the received samples or received symbols for M frequency subbands used for signaling transmission to obtain detected signaling data, wherein signaling data is spread across the M frequency subbands prior to transmission, and wherein the M frequency subbands are selected from among N frequency subbands usable for transmission, where M and N are each greater than one and M is less than or equal to N. - View Dependent Claims (49, 50, 51, 52)
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53. An apparatus in a wireless communication system utilizing orthogonal frequency division multiplexing (OFDM), comprising:
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means for performing demodulation on received samples to obtain received symbols; and
means for despreading the received samples or received symbols for M frequency subbands used for signaling transmission to obtain detected signaling data, wherein signaling data is spread across the M frequency subbands prior to transmission, and wherein the M frequency subbands are selected from among N frequency subbands usable for transmission, where M and N are each greater than one and M is less than or equal to N. - View Dependent Claims (54, 55, 56, 57)
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Specification