Unitary space-time modulation using nonconstant-energy signals

Tzu Shiang Lin, Ruey Yi Wei

Research output: Contribution to journalArticlepeer-review


Unitary space-time modulation (USTM) is a kind of noncoherent space-time block codes. Codes of USTM which have been proposed all use PSK (phase-shift keying) signals. In this paper, we propose three new USTM schemes in which nonconstant-energy signals are used. The first scheme utilizes APSK (amplitude phase-shift keying) signals while the second scheme utilizes APSK signals combined with PSK signals. Codes of both schemes are found by computer searches. In the third scheme, we use the space-time block code to design high-rate USTM. Codes of the proposed schemes all have larger diversity product than codes of USTM using PSK signals.

Original languageEnglish
Pages (from-to)15-21
Number of pages7
JournalInternational Journal of Electrical Engineering
Issue number1
StatePublished - Feb 2016


  • Amplitude and phase-shift keying (apsk)
  • Space-time block code (STBC)
  • Unitary space-time modulation (USTM)


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