Title :
Performance analysis of word-length effect on the hardware design in MMSE/DD space-time array receiver
Author :
Lee, Jun Hwan ; Oh, Hyun Seo ; Kyeong, Mun Geon
Author_Institution :
Radio & Broadcasting Technol. Lab., ETRI, Taejon, South Korea
Abstract :
In this paper, the BER performance of MMSE/DD (decision-directed minimum mean square error) adaptation algorithm-based space-time array receiver was analyzed for wideband CDMA basestation system, taking account of word length or quantized bit size of weight and input snapshot vectors under Rayleigh fading channel with two multipaths and mobile speed of 60 km/h and 200 km/h. In conjunction with existing demodulator input to the base station modem chip, the floating and fixed point simulation results were examined and the basic guideline to determine the optimal bit resolution of weight and IQ input vectors fed into DBFN (digital beamforming network) was recommended for efficient design of digital beamformers and multi-channel ADCs (analog-to-digital converters)
Keywords :
Rayleigh channels; adaptive antenna arrays; analogue-digital conversion; array signal processing; broadband networks; code division multiple access; error statistics; fixed point arithmetic; floating point arithmetic; land mobile radio; least mean squares methods; multipath channels; radio receivers; receiving antennas; 200 km/h; 60 km/h; BER performance; DBFN; IQ input vectors; MMSE/DD space-time array receiver; Rayleigh fading channel; adaptation algorithm-based space-time array receiver; analog-to-digital converters; basestation modem chip; decision-directed minimum mean square error receiver; demodulator input; digital beamforming; fixed point simulation results; floating point simulation results; hardware design; mobile speed; multi-channel ADCs; multipath; optimal bit resolution; performance analysis; quantized bit size; wideband CDMA basestation system; word-length effect; Adaptive arrays; Algorithm design and analysis; Bit error rate; Fading; Functional analysis; Hardware; Mean square error methods; Multiaccess communication; Performance analysis; Wideband;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd
Conference_Location :
Rhodes
Print_ISBN :
0-7803-6728-6
DOI :
10.1109/VETECS.2001.944825
