Transmit diversity scheme
AssigneeNEC Corporation
InventorsPhong Nguyen, Jolyon White
Life of this patent
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Abstract
The present invention relates to methods for implementing transmit diversity in a telecommunication network. In particular there is provided an algorithm for performing transmit diversity encoding in a transmitter (100) and transmit diversity decoding in a receiver (1700) respectively. In the method processed pairs of data blocks (314.1A, 314.1B) are transmitted on a first antenna (112.1) on N sub-carriers in a first temporal order; and a second antenna (112.2) in the reverse temporal order.
Claims26
A method of processing at least one sequence of data symbols to be transmitted over a wireless channel including N sub-carriers having different frequencies, comprising:
- defining, in the at least one sequence of data symbols, a plurality of blocks of data symbols, each of said blocks of data symbols including one data symbol corresponding to each of the N sub-carriers,
- processing each of said blocks of data symbols such that the correspondence between at least two of the data symbols in the block and their respective sub-carriers are changed, to create a processed block in which each data symbol corresponds to one of said sub-carriers;
- for each processed block of data symbols, generating a corresponding conjugated block of data symbols which includes N symbols that are the complex conjugate of a corresponding data symbol in the processed block of symbols;
- processing pairs of said processed blocks of symbols for transmission on a first antenna on the N sub-carriers in a temporal first order;
- and
- processing pairs of said conjugated blocks of symbols for transmission on a second antenna on the N sub-carriers in the reverse temporal order.
A method of processing at least one sequence of data symbols to be transmitted over a wireless channel, comprising:
- (a) defining, in the at least one sequence of data symbols, a plurality of blocks of symbols;
- (b) processing the least one sequence of data symbols on a block-by-block basis to provide frequency diversity in the subsequently transmitted signal;
- (c) processing the blocks of data in groups of two or more blocks to provide time diversity in the subsequently transmitted signal;
- and
- (d) processing the blocks of data for transmission over at least two antennas to provide for spatial diversity in the subsequently transmitted signal.
A transmit diversity encoder configured to process at least one sequence of data symbols to be transmitted over a wireless channel including N sub-carriers having different frequencies, comprising:
- a block defining stage configured to define, in the at least one sequence of data symbols, a plurality of blocks of symbols;
- a frequency encoder configured to process the blocks of symbols to provide frequency diversity within the blocks of symbols;
- a space-time encoder configured to process the blocks of data in groups of two or more blocks to provide time diversity between blocks for transmission over different antennas.
A method of processing a received sequence of data symbols transmitted over a wireless channel, comprising:
- determining a space-time encoding scheme used it the transmission of sequence the data symbols;
- defining at least one block of data symbols in the received sequence of data symbols on the basis of the determined space-time encoding scheme;
- and
- processing the at least one block of data symbols, in accordance with the determined space-time encoding scheme.
(canceled)
Dependencies are inferred from the claim text.