On high-rate full-diversity 2x2 space-time codes with low-complexity optimum detection
The 2×2 MIMO profiles included in Mobile WiMAX specifications are Alamouti’s space-time code (STC) fortransmit diversity and spatial multiplexing (SM). The former has/nfull diversity and the latter has full rate, but neither of them has/nboth of these desired features. An alternative 2×2 STC, which...
| Authors: | , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2009 |
| Country: | España |
| Institution: | Universitat Pompeu Fabra |
| Repository: | Repositorio Digital de la UPF |
| OAI Identifier: | oai:repositori.upf.edu:10230/20433 |
| Online Access: | http://hdl.handle.net/10230/20433 http://dx.doi.org/10.1109/TCOMM.2009.05.070643 |
| Access Level: | Open access |
| Keyword: | Comunicació sense fil, Sistemes de Sistemes MIMO ML detection Multiple-input multiple-output (MIMO) Space-time codes (STCs) |
| Summary: | The 2×2 MIMO profiles included in Mobile WiMAX specifications are Alamouti’s space-time code (STC) fortransmit diversity and spatial multiplexing (SM). The former has/nfull diversity and the latter has full rate, but neither of them has/nboth of these desired features. An alternative 2×2 STC, which is both full rate and full diversity, is the Golden code. It is the best known 2×2 STC, but it has a high decoding complexity. Recently, the attention was turned to the decoder complexity, this issue was/nincluded in the STC design criteria, and different STCs were/nproposed. In this paper, we first present a full-rate full-diversity/n2×2 STC design leading to substantially lower complexity of/nthe optimum detector compared to the Golden code with only a slight performance loss. We provide the general optimized form of this STC and show that this scheme achieves the diversitymultiplexing frontier for square QAM signal constellations. Then, we present a variant of the proposed STC, which provides a further decrease in the detection complexity with a rate reduction of 25% and show that this provides an interesting trade-off between the Alamouti scheme and SM. |
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