Title :
Performance of a MIMO system with overlay pilots
Author :
Jungnickel, V. ; Haustein, T. ; Jorswieck, E. ; Pohl, V. ; von Helmolt, C.
Author_Institution :
Heinrich-Hertz-Inst. fur Nachrichtentech. Berlin GmbH, Germany
Abstract :
A multiple-input multiple-output (MIMO) indoor radio system is studied to identify the origin of a typical performance degradation. When the data and overlay pilot-sequences for the channel estimation are transmitted at the same time, an error floor at high signal-to-noise ratio is normally observed. The floor is caused by channel estimation errors due to the interfering data signal. The crosstalk between the data paths can be calculated, approximately, and it is shown that the shape of the bit error curves can be steered both with the amplitude ratio η between pilot and data signals and with the length L of the sequences. Near-optimum performance can be reached in this way. With L = 16383, for instance, an amplitude ratio of η ⩾ 0.15 (0.3) is sufficient for BPSK (16-QAM) modulation in a MIMO system with 8 transmit and 12 receive antennas
Keywords :
MIMO systems; binary sequences; crosstalk; data communication; error statistics; indoor radio; phase shift keying; quadrature amplitude modulation; receiving antennas; transmitting antennas; wireless LAN; 16-QAM; BPSK modulation; MIMO system; WLAN; bit error curves; channel estimation; crosstalk; data sequences; error floor; indoor radio; multiple-input multiple-output system; overlay pilot sequences; performance degradation; receive antennas; signal-to-noise ratio; transmit antennas; wireless local area networks; Amplitude modulation; Binary phase shift keying; Channel estimation; Crosstalk; Degradation; Indoor radio communication; MIMO; Shape; Signal to noise ratio; Time of arrival estimation;
Conference_Titel :
Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-7206-9
DOI :
10.1109/GLOCOM.2001.965186
