Li Zhengquan

Quasi-orthogonal Space Time Block Code for Decode-and-Forward Relay Networks

A kind of quasi-orthogonal space time block code for decode-and-forward relay networks is analyzed in this paper. At the source, 4 single-antenna users transmit the quasi-orthogonal space time block code matrix. At the relay node, maximum-likelihood decoding algorithm is adopted and the decoded symbols are then encoded into quasi-orthogonal code which is transmitted through transmit antenna. At the destination, pair-wise decoding algorithm is utilized. Finally we compare the performance of the quasi-orthogonal space time block code in relay networks with that of the quasi-orthogonal space time block code in traditional communication system. Simulation results show that at the given BER of 10-3, the new code can provide a gain of 4dB and 1.8dB comparing with that for the traditional quasi-orthogonal code. And at the given BER of 10-5, the new code can provide a gain of 4.5dB and 3.5dB comparing with that for the old quasi-orthogonal code.

Linear Dispersion Codes Based on Coordinate Interleaved Orthogonal Designs

The authors presented a new design scheme for LDCs that new design scheme for LDC that directly minimizes the block error rate in MIMO channels with arbitrary fading statistics and various detection algorithms. In this paper, we construct linear dispersion codes based on coordinate interleaved orthogonal designs (CIOD LDCs).

Constellations rotation for quasi-orthogonal space time polarization block code in keyhole channel

A new kind of constellation rotation for quasi-orthogonal space time polarization block code in keyhole channel is introduced in this paper. This kind of space time block code of 4 and 8 transmit antennas are designed, the new codes with full diversity can transmitted through dual-polarized antennas and received through dual-polarized antennas. Last the new codes is compared with the traditional quasi-orthogonal space-time block code in keyhole channel. Simulation result show that the new code can increase bit error rate compared with the constellation rotation for quasi-orthogonal space-time polarization block code in keyhole channel, and can reduce bit error rate compared with he traditional quasi-orthogonal space-time block code in keyhole channel.

Space Time Polarization Block Codes Based on Coordinate Interleaved Quaternion Orthogonal Designs

We introduce in this paper a new kind of space time polarization block codes. The new codes can transmitted through dual-polarized antennas and received through dual-polarized antennas. Compared with traditional complex orthogonal space-time block codes, the new codes can reduce bit error rate.

Space-Time Codes Based on Bit-Interleaved Quasi-Super-Orthogonal Designs

We introduce in this paper a new kind of space-time codes. The new codes can exist for 2,3,4 transmit antennas of rate l,and exist for 5,6,7,8 transmit antennas of rate 3/4, and for any number transmit antennas of rate 1/2. At the same time the new codes can provide full diversity and high coding gain.

Space-Time Block Codes from Coordinate Symmetric Super-Orthogonal Designs

In this paper, we propose space-time block codes from coordinate symmetric super-orthogonal designs. Compared with space time block codes from complex orthogonal designs, our codes can reduce the bit error rate, improve the performance of system, and exist for more transmit antennas.