Systems and methods for transmit diversity for DFT precoded channels
First Claim
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1. In a mobile terminal having a first antenna and a second antenna, a transmit diversity method for discrete Fourier transform (DFT) precoded channels, the method comprising:
- producing a block of data symbols;
transforming said block of data symbols to produce a first block of transformed symbols and a second block of transformed symbols;
using the first antenna, transmitting the first block of transformed symbols and a first reference sequence, wherein the transmitting step occurs during a slot of a subframe of a radio frame; and
using the second antenna, transmitting, during said slot, the second block of transformed symbols and a second reference sequence, whereinthe first block of transformed symbols is transmitted using only a first set of subcarriers,the second block of transformed symbols is transmitted using only a second set of subcarriers that is orthogonal to the first set of subcarriers, andthe first reference sequence and the second reference sequence are transmitted using a third set of subcarriers that comprises that first set of subcarriers and the second set of subcarriers.
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Abstract
A transmission method and apparatus that combines the benefits of DFT precoding and transmit diversity coding for PUCCH transmission. In one aspect, the invention provides an improved transmit diversity coding method and apparatus for DFTS-OFDM PUCCH with minimal impact on multiplexing capacity. In one embodiment, the improved transmit diversity method and apparatus has the feature of employing frequency-domain separation for the payload signals.
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Citations
25 Claims
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1. In a mobile terminal having a first antenna and a second antenna, a transmit diversity method for discrete Fourier transform (DFT) precoded channels, the method comprising:
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producing a block of data symbols; transforming said block of data symbols to produce a first block of transformed symbols and a second block of transformed symbols; using the first antenna, transmitting the first block of transformed symbols and a first reference sequence, wherein the transmitting step occurs during a slot of a subframe of a radio frame; and using the second antenna, transmitting, during said slot, the second block of transformed symbols and a second reference sequence, wherein the first block of transformed symbols is transmitted using only a first set of subcarriers, the second block of transformed symbols is transmitted using only a second set of subcarriers that is orthogonal to the first set of subcarriers, and the first reference sequence and the second reference sequence are transmitted using a third set of subcarriers that comprises that first set of subcarriers and the second set of subcarriers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A transmit diversity apparatus for discrete Fourier transform (DFT) precoded channels, the apparatus comprising:
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a first antenna; a second antenna; and a data processor coupled to the first antenna and the second antenna, the data processor being configured to;
(a) produce a block of data symbols from a set of message bits;
(b) transform said block of data symbols to produce a first block of transformed symbols and a second block of transformed symbols;
(c) use the first antenna to transmit, during a slot of a subframe of a radio frame, the first block of transformed symbols and a first reference sequence; and
(d) use the second antenna to transmit, during said slot, the second block of transformed symbols and a second reference sequence, whereinthe data processor is further configured such that (a) the first block of transformed symbols is transmitted using only a first set of subcarriers, (b) the second block of transformed symbols is transmitted using only a second set of subcarriers that is orthogonal to the first set of subcarriers, and (c) the first reference sequence and the second reference sequence are transmitted using a third set of subcarriers that comprises that first set of subcarriers and the second set of subcarriers. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A mobile terminal comprising a transmit diversity apparatus for discrete Fourier transform (DFT) precoded channels, the apparatus comprising:
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a first antenna; a second antenna; and a data processor coupled to the first antenna and the second antenna, the data processor being configured to;
(a) produce a block of data symbols from a bit sequence;
(c) transform said block of data symbols to produce a first block of transformed symbols and a second block of transformed symbols;
(d) use the first antenna to transmit, during a slot of a subframe of a radio frame, the first block of transformed symbols and a first reference sequence; and
(e) use the second antenna to transmit, during said slot, the second block of transformed symbols and a second reference sequence, whereinthe data processor is further configured such that (a) the first block of transformed symbols is transmitted using only a first set of subcarriers, (b) the second block of transformed symbols is transmitted using only a second set of subcarriers that is orthogonal to the first set of subcarriers, and (c) the first reference sequence and the second reference sequence are transmitted using a third set of subcarriers that comprises that first set of subcarriers and the second set of subcarriers.
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Specification