Abstract
This paper presents a natural concatenation between the real or complex square orthogonal designs and the differential unitary space-time modulation scheme for multiple transmit antennas. This concatenation renders the differential unitary space-time demodulator to detect in a decoupled way the information symbols and hence to have a very low decoding complexity. This fast differential demodulation method for multiple transmit antennas can be regarded as a generalization of the existing differential detection method proposed by Tarokh and Jafarkhani for two and four transmit antennas based on orthogonal designs. By using a systematic matrix-vector representation, a unified and simplified form of differential unitary demodulation via square orthogonal designs for any number of transmit antennas and any transmission rate in bits per channel use is provided.
| Original language | English |
|---|---|
| Pages (from-to) | 1331-1336 |
| Number of pages | 6 |
| Journal | IEEE Transactions on Wireless Communications |
| Volume | 4 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Jul 2005 |
| Externally published | Yes |
Keywords
- Differential unitary space-time modulation
- Fast decoding algorithms
- Maximum-likelihood demodulator
- Multiple antennas
- Orthogonal designs
- Square orthogonal designs
- Transmit diversity
- Wireless communications