Differential space–time code
Differential space–time codes[1][2] are a way of transmitting data in wireless communications. They are a form of space–time code that does not need to know the channel impairments at the receiver in order to be able to decode the signal. They are usually based on space–time block codes, and transmit one block-code from a set in response to a change in the input signal. The differences among the blocks in the set are designed to allow the receiver to extract the data with good reliability. The first differential space-time block code was disclosed by Vahid Tarokh and Hamid Jafarkhani.[1]
There are other space-time codes that do not assume channel knowledge at the receiver but need knowledge of the statistics of channel — these are known as non-coherent space–time codes. Non-coherent space-time transmission schemes were proposed by Tom Marzetta and Bertrand Hochwald in 1999,[3][4] but these schemes are complex in implementation terms. This complexity issue was resolved by Vahid Tarokh and Ilmin Kim in 2002.[5]
References
- ^ a b V. Tarokh and H. Jafarkhani (July 2000). "A Differential Detection Scheme for Transmit Diversity". IEEE Journal on Selected Areas in Communications. 18 (7). doi:10.1109/49.857917.
{{cite journal}}: Unknown parameter|Page=ignored (|page=suggested) (help) - ^ H. Jafarkhani and V. Tarokh (September 2001). "Multiple Transmit Antenna Differential Detection from Generalized Orthogonal Designs". IEEE Transactions on Information Theory. 47 (6). doi:10.1109/18.945280.
{{cite journal}}: Unknown parameter|Page=ignored (|page=suggested) (help) - ^ Marzetta, T.L. and Hochwald, B.M. (January 1999). "Capacity of a mobile multiple-antenna communication link in Rayleigh flat fading". IEEE Transactions of Information Theory. 45 (1): 139–157. doi:10.1109/18.746779.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ Hochwald, B.M. and Marzetta, T.L. (March 2000). "Unitary space-time modulation for multiple-antenna communications in Rayleigh flat fading". IEEE Transactions of Information Theory. 46 (2): 543–564. doi:10.1109/18.825818.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ Tarokh, V. and Il-Min Kim (December 2002). "Existence and construction of noncoherent unitary space-time codes". IEEE Transactions on Information Theory. 48 (12): 3112–3117. doi:10.1109/TIT.2002.805075.
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