Differential Group Space-Time Block Coded CPM

TitleDifferential Group Space-Time Block Coded CPM
Publication TypeConference Paper
Year of Publication2007
AuthorsRiediger, M. L. B., and P. K. M. Ho
Conference NameWireless Communications and Networking Conference, 2007.WCNC 2007. IEEE
Pagination594 -599
Date Publishedmar.
Keywordsblock codes, constant envelope modulations, continuous phase modulation, conventional differential detection, differential group code, differential group space-time block coded CPM, interference suppressed statistics, M-ary full-response CPM, multiple transmit antennas, noncoherent receiver, radio receivers, space-time codes, spectral bandwidth, ST differential encoding, transmitting antennas, unitary space-time codes

Motivated by the desirable attributes of unitary space-time (ST) codes and constant envelope modulations, we introduce an ST continuous phase modulation (CPM) methodology and its companion noncoherent receiver. We consider M-ary full-response CPMs, with a modulation index of 1/M and multiple transmit antennas. Through careful selection of an underlying differential group code, the defining characteristics of the CPM transmissions (constant envelope and spectral bandwidth) are effectively maintained. Using a set of interference suppressed statistics and taking advantage of the underlying ST differential encoding, the receiver performs conventional differential detection (CDD). Results for M = 2 with four transmit antennas show that the proposed CDD performs within 4 dB of the coherent detection lower bound, at a symbol-error-rate of 10-. Furthermore, due to the underlying unitary structure of the ST-CPM, the CDD achieves a diversity order comparable to that of coherent detection at high SNR.


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