P. W. Baier, M. Meurer, T. Weber, and H. Troger, "Joint transmission (JT), an alternative rationale for the downlink of time division CDMA using multielement transmit antennas," in Proc. Int. Symp. Spread Spectrum Techniques and Applications. Newark, NJ: NJIT, Sept. 2000, pp. 1--5.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....In Section II, our system model will be described. We will then derive in Section III the optimum precoding method such that the interference is completely eliminated with minimum transmit power. The resulting zero forcing precoding technique was obtained independently by other authors [15] [17] but using different criteria. We will also provide a new insight on the relationship between joint precoding and a pre Rake. 1536 1276 03 17.00 2003 IEEE (a) b) Fig. 1. Joint precoding concept. We will see that full elimination of the interference is effective however only up to a ....

....displayed in Fig. 2. It should be mentioned here that this is equivalent to a zero forcing multiuser detector [18] and it will be called zero forcing precoder henceforth in this work. Furthermore, it must be mentioned that the same transmitter equations were obtained through different methods in [15] [17] The same conclusions taken here for a system with conventional receivers apply also when a Rake receiver is employed, in which case the channel H in (30) and (32) should be substituted with the equivalent channel . Fig. 3. Performance of joint precoding with interference elimination. ....

P. W. Baier, M. Meurer, T. Weber, and H. Troger, "Joint transmission (JT), an alternative rationale for the downlink of time division CDMA using multielement transmit antennas," in Proc. Int. Symp. Spread Spectrum Techniques and Applications. Newark, NJ: NJIT, Sept. 2000, pp. 1--5.

....included. A = P.H.VT.C = C H.VR.H.VT.C (7) 3. 1 Unbiased MMSE Criterion The unbiased MMSE solution of Vojcic [2] results in the inverse of the system matrix, T = n] 8) If in (8) a pre Rake in the Tx, a simple codematched filter in the Rx, this technique is known as Joint Transmission [3] or Joint Pre Distortion [8] or Joint Signal Precoding [6] According to [3] 8) is invertible under realistic conditions. 3.2 Biased MMSE Criterion In section 3.1, only interference is considered whereas the noise variance is not included in the computation of T. Similar to the joint detection ....

.... The unbiased MMSE solution of Vojcic [2] results in the inverse of the system matrix, T = n] 8) If in (8) a pre Rake in the Tx, a simple codematched filter in the Rx, this technique is known as Joint Transmission [3] or Joint Pre Distortion [8] or Joint Signal Precoding [6] According to [3], 8) is invertible under realistic conditions. 3.2 Biased MMSE Criterion In section 3.1, only interference is considered whereas the noise variance is not included in the computation of T. Similar to the joint detection (JD) approach in the receiver with biased MMSE [11] the biased MMSE Tx ....

P. Baier, M. Meurer, T. Weber, and H. Tr6ger, "Joint Transmission (JT), an alternative rationale for the downlink of Time Division CDMA using multi-element transmit antennas", IEEE ISSSTA, p.l-5, New Jersey, USA (2000)

....employing TDD, where in each cell an access point (AP) communicates with a number of mobile terminals (MTs) The considerations concern the link level, that is a single cell is studied. As a promising DL transmission technique the concept Joint Transmission (JT) has been recently proposed in [1, 2, 3, 4]. In conventional DL transmission schemes the transmitter algorithms utilized at the AP are a priori given, whereas the algorithms to be used at the receivers of the MTs have to be a posteriori adapted under consideration of channel state information, see for instance [5] This rationale can be ....

....channel estimation at the AP can be beneficially used to enhance the system performance when a posteriori determining the transmit signals. Up to now JT DLs have been investigated for the case that the AP is equipped with multi antennas and that the MTs are provided with single antennas each [1, 2, 3, 4]. In this case the JT DL between the AP and each MT is modelled as a MISO (Multiple Input Single Output) system. In this paper an extension of previous work on JT MISO DLs is presented by providing multi antennas at both the AP and the MTs. Consequently, the DL between the AP and each MT is ....

[Article contains additional citation context not shown here]

P.W. Baier, M. Meurer, T. Weber, and H. Tr oger, "Joint transmission (JT), an alternative rationale for the downlink of time division CDMA using multi-element transmit antennas," Proc. IEEE 6th International Symposium on Spread Spectrum Techniques & Applications (ISSSTA 2000.

....part of the transmission capacity, and the implementation of rather expensive channel estimators at the MTs. # The a posteriori determined demodulators may turn out to be rather complex, especially if the modulation comprises spectral spreading in the sense of CDMA, see for instance [1] In [2, 3, 4, 5] an alternative rationale for downlink transmission termed Joint Transmission (JT) was presented, which is capable of avoiding the mentioned disadvantages. As explained in more detail in [2, 3, 4, 5] the term JT was chosen, because one common transmit signal for the support of all MTs is jointly ....

....if the modulation comprises spectral spreading in the sense of CDMA, see for instance [1] In [2, 3, 4, 5] an alternative rationale for downlink transmission termed Joint Transmission (JT) was presented, which is capable of avoiding the mentioned disadvantages. As explained in more detail in [2, 3, 4, 5], the term JT was chosen, because one common transmit signal for the support of all MTs is jointly generated at the BS. The crux of JT consists in # setting out from a priori selected low cost demodulators, # determining the modulator in the BS a posteriori based on the properties of the ....

[Article contains additional citation context not shown here]

P.W. Baier, M. Meurer, T. Weber and H. Troger, "Joint transmission (JT), an alternative rationale for the downlink of time division CDMA using multi-element transmit antennas", Proc. IEEE 6th International Symposium on Spread Spectrum Techniques & Applications (ISSSTA 2000.

Online articles have much greater impact   More about CiteSeer.IST   Add search form to your site   Submit documents   Feedback  

CiteSeer.IST - Copyright Penn State and NEC