In this paper we present space-time block codes called 'Co-ordinate interleaved orthogonal designs' (CIOD). These codes have low decoding complexity; same as that of the codes from complex orthogonal designs (COD). Rate 1 CIOD exist for two, three and four transmit antennas and rate 3/4 CIOD exist for five, six, seven and eight transmit antennas while COD exists only for two antennas and generalized COD (GCOD) of rate 3/4 are known to exist for three and four transmit antennas only. The maximum mutual information of these codes is also calculated.

Mohammed Zafar Ali Khan

Department of Electrical Engineering

B. Sundar Rajan

Indian Institute of Technology Hyderabad (IITH) is a premier institute of science and technology established in 2008. IITH has been consistently ranked in the&nbsp;<a href="https://iith.ac.in/reports/" rel="noopener noreferrer">top 10 institutes</a>&nbsp;in India for Engineering&nbsp;<a href="https://www.nirfindia.org/2021/EngineeringRanking.html" rel="noopener noreferrer" target="_blank">according to NIRF</a>&nbsp;making it one of the most coveted schools for science and technology in the country.

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Journal	IEEE International Symposium on Information Theory - Proceedings
ISSN	21578095