Abstract
Recently, multi-carrier code-division multiple-access (MC-CDMA) has attracted much attention. To make smoothly connection with a base station (BS), time division duplex (TDD) systems using the reciprocity of uplink and downlink in the same frequency band is considered. If the coherence time is large compared with the duplexing time, TDD systems can provide the channel characteristics of uplink from that of downlink. Thus, the channel distortion can be compensated in advance as a pre-equalization at mobile terminals (MTs). The pre-equalization technique using zero-forcing equalization (ZFE) was proposed for the TDD/MC-CDMA system. The channel parameters obtained from the last pilot (LP) symbol in the downlink frame have the highest time correlations with the uplink channel parameters. Therefore, they can be used as the channel parameters of all the symbols in the following frame. However, when the coherence time is not so large compared with the duplexing time, it is expected that the system suffers from the channel mismatch by time-selective fading. In this paper, we propose a pre-equalization using MMSE channel prediction for TDD/MC-CDMA. As a derivation of the pre-equalization coefficients, we employ ZFE, Controlled Equalization (CE), and Minimum Mean Square Error Equalization (MMSEE). Simulation results show that the proposed channel prediction techniques are effective on time-selective fading channels.
| Original language | English |
|---|---|
| Title of host publication | IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC |
| Pages | 291-295 |
| Number of pages | 5 |
| Volume | 1 |
| Publication status | Published - 2005 |
| Event | 2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2005 - Berlin, Germany Duration: 2005 Sep 11 → 2005 Sep 14 |
Other
| Other | 2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2005 |
|---|---|
| Country | Germany |
| City | Berlin |
| Period | 05/9/11 → 05/9/14 |
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ASJC Scopus subject areas
- Engineering(all)
Cite this
Uplink pre-equalization using MMSE prediction for TDD/MC-CDMA systems. / Takei, Yoshikazu; Ohtsuki, Tomoaki.
IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC. Vol. 1 2005. p. 291-295 1651445.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Uplink pre-equalization using MMSE prediction for TDD/MC-CDMA systems
AU - Takei, Yoshikazu
AU - Ohtsuki, Tomoaki
PY - 2005
Y1 - 2005
N2 - Recently, multi-carrier code-division multiple-access (MC-CDMA) has attracted much attention. To make smoothly connection with a base station (BS), time division duplex (TDD) systems using the reciprocity of uplink and downlink in the same frequency band is considered. If the coherence time is large compared with the duplexing time, TDD systems can provide the channel characteristics of uplink from that of downlink. Thus, the channel distortion can be compensated in advance as a pre-equalization at mobile terminals (MTs). The pre-equalization technique using zero-forcing equalization (ZFE) was proposed for the TDD/MC-CDMA system. The channel parameters obtained from the last pilot (LP) symbol in the downlink frame have the highest time correlations with the uplink channel parameters. Therefore, they can be used as the channel parameters of all the symbols in the following frame. However, when the coherence time is not so large compared with the duplexing time, it is expected that the system suffers from the channel mismatch by time-selective fading. In this paper, we propose a pre-equalization using MMSE channel prediction for TDD/MC-CDMA. As a derivation of the pre-equalization coefficients, we employ ZFE, Controlled Equalization (CE), and Minimum Mean Square Error Equalization (MMSEE). Simulation results show that the proposed channel prediction techniques are effective on time-selective fading channels.
AB - Recently, multi-carrier code-division multiple-access (MC-CDMA) has attracted much attention. To make smoothly connection with a base station (BS), time division duplex (TDD) systems using the reciprocity of uplink and downlink in the same frequency band is considered. If the coherence time is large compared with the duplexing time, TDD systems can provide the channel characteristics of uplink from that of downlink. Thus, the channel distortion can be compensated in advance as a pre-equalization at mobile terminals (MTs). The pre-equalization technique using zero-forcing equalization (ZFE) was proposed for the TDD/MC-CDMA system. The channel parameters obtained from the last pilot (LP) symbol in the downlink frame have the highest time correlations with the uplink channel parameters. Therefore, they can be used as the channel parameters of all the symbols in the following frame. However, when the coherence time is not so large compared with the duplexing time, it is expected that the system suffers from the channel mismatch by time-selective fading. In this paper, we propose a pre-equalization using MMSE channel prediction for TDD/MC-CDMA. As a derivation of the pre-equalization coefficients, we employ ZFE, Controlled Equalization (CE), and Minimum Mean Square Error Equalization (MMSEE). Simulation results show that the proposed channel prediction techniques are effective on time-selective fading channels.
UR - http://www.scopus.com/inward/record.url?scp=34047132257&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34047132257&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:34047132257
SN - 3800729091
SN - 9783800729098
VL - 1
SP - 291
EP - 295
BT - IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC
ER -