N.Yee, J.P.M.G.Linnartz, and G.Fettweis. Multi-Carrier CDMA in Indoor Wireless Radio Networks. Proceedings PIMRC'93, Yokohama, Japan, 1993, pp.109-113.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....enables full multipath diversity that can be collected at the receiver by MRC. SS OFDM only transmits one information symbol per OFDM block, which comes at the price of considerable rate loss. To share the N subcarriers among multiple (say U ) users, multi carrier (MC) CDMA has been advocated in [22], where different users are distinguished by their signature codes c u=0 . The received vector becomes r(i) D h,u c u s u (i) w(i) 6) where D h,u and s u (i) are the corresponding diagonal channel matrix and information symbol for user u. With U 2, optimal decoding requires ....

N. Yee, J-P. Linnartz, and G. Fettweis, "Multicarrier CDMA in indoor wireless radio networks," in Proc. of IEEE PIMRC, Sept. 1993, pp. 109--113.

....redundancy by using J subcarriers to transmit K symbols. In the extreme case, all the N available subcarriers can be used to transmit one symbol, which is essentially SS OFDM proposed in [4] To make up for the considerable rate loss inherent in SS OFDM, multicarrier (MC) CDMA has been proposed in [13], where different users share all the subcarriers and are distinguished by their signature codes. MUI thus appears, that needs to be suppressed by joint multiuser detection (MUD) The performance of MC CDMA is upper bounded by SS OFDM, because the latter corresponds to the best scenario where ....

N. Yee, J-P. Linnartz, and G. Fettweis, "Multicarrier CDMA in indoor wireless radio networks," in Proc. of IEEE PIMRC, Sept. 1993, pp. 109-- 113.

....achieve significantly higher data rates with a wide range of coverage. In a broadband channel with an approximate 50 100 MHz bandwidth comprising many multipaths, the authors clarified that orthogonal frequency and code division multiplexing (OFCDM) which is originally based on multicarrier CDMA [3], 4] or orthogonal frequency division multiplexing (OFDM) exhibits better performance than conventional DS CDMA based wireless access in the forward link [5] 7] This is because OFCDM and OFDM mitigate the degradation due to severe multipath interference in a broadband channel using many low ....

N. Yee, J.-P. Linnartz, and G. Fettweis, "Multi-Carrier CDMA in indoor wireless radio networks," PIMRC '93, pp. 109-113, Sept. 1993.

....an expression of the BER for BPSK modulation will be derived for an UL scenario. A comparison will be finally made in terms of BER between NCP MC CDMA schemes that use equalising receivers and CP MC CDMA schemes. II. THE CP MC CDMA TRANSMITTER The block diagram of the CP MC CDMA transmitter [2] including the mobile channel, is depicted in Figure 1. The complex symbols transmitted by user k during the signaling iteration n are first up sampled by a factor of Nc and then provide input to a FIR filter, of length No, with an IR ak (m) This operation is actually identical to the spreading ....

N. Yee, J.-P. Linnartz, G. Fettweis, "Multi-carrier CDMA in indoor wireless radio networks", in Proceedings of the IEEE International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC'93), Yokohama, Japan, pp. 109-113, 1993.

.... with a maximum data rate above 100 Mbps using an approximate 50 to 100 MHz bandwidth [3] 5] In such a broadband channel comprising many multipaths, the authors clarified that Orthogonal Frequency and Code Division Multiplexing (OFCDM) which is originally based on Multi carrier CDMA (MC CDMA) [6], 7] or Orthogonal Frequency Division Multiplexing (OFDM) exhibits better performance than conventional DS CDMA based wireless access [3] 5] This is because OFCDM and OFDM mitigate the degradation due to severe multipath interference (MPI) in a broadband channel using many low symbol rate ....

N. Yee, J.-P. Linnartz, and G. Fettweis, "Multi-Carrier CDMA in indoor wireless radio networks," IEEE PIMRC'93, pp. 109-113, Sept. 1993.

.... Despite big implementation challenges, like designing linear amplifiers to cope with the large Peak toAverage Power ratio of an OFDM signal, multi carrier schemes are promising and has been subject to intensive research over the years, 2 4] The earlier proposed Multi Carrier CDMA (MC CDMA) [5 7] and Multi Carrier Direct Sequence CDMA (MC DSCDMA) 8] systems spread the symbols either in the frequency or in the time direction [3] Theses schemes are illustrated in figures 1c and d. A frequency selective fading channel will scale the chips di#erently and cause correlation between the ....

N. Yee, J-P. Linnartz, and G. Fettweis, "Multicarrier CDMA in indoor wireless radio networks, " in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Yokohama, Japan, Sept. 1993, pp. 109--113.

....The code tree upto level 3, consisting of a total of 7 codes, is shown in Figure 2. OVSF codes allow us to allocate variable spread factor codes, resulting in variable data rate allocation to the terminals, while still maintaining orthogonality. A pair of C (1) 1] 1 C (1) 11] C (2) [10] 2 C (4) 1001] C (2) 1100] C (1) 1111] C (3) 1010] 3 3 3 2 3 SF=2 SF=4 SF=1 Fig. 2. Orthogonal Variable Spreading Factor Code Tree shown up to level 3. possibly di erent length) codes in this set are orthogonal to each other except when one is derived from the other. C. ....

....1=T b at baseband, where T b is the symbol duration. This results in the subcarriers being orthogonal to each other at baseband. At the receiver, by multiplying with the particular frequency of interest and summing over a symbol duration, we can isolate the symbol component at that subcarrier [10]. MC CDMA is a combination of DS CDMA (Direct Sequence CDMA) and the OFDM (Orthogonal Frequency Division Multiaccess) techniques and inherits all the good and bad properties of its parents[9] MC CDMA transmits the same symbol over a number of parallel subcarriers, where the number of subcarriers ....

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Nathan Yee, J.P. Linnartz, and G. Fettweis, Multicarrier cdma in an indoor wireless radio network, in Proc. IEEE PIMRC, Sep 1993, pp. 109113.

....pair mutually agree on a code before initiating communication. Receiver terminals are equipped with the facility to broadcast the code on which they are receiving their transmission. This is done on a broadcast channel (time slot) during the Medium Access Control layer ACK phase. If the MC CDMA[6], 7] is being used, then this can be done easily without extra hardware and without encroaching on the data transmission, as shown in [8] A CDMA system with code reuse is prone to the problem of secondary interference. Two possible situations in which such interference can occur, as observed in ....

Nathan Yee, J.P. Linnartz, and G. Fettweis, Multicarrier CDMA in an indoor wireless radio network, in Proc. IEEE PIMRC, Sep 1993, pp. 109113.

.... interference (NBI PBI) 14] FD SS, with disjoint frequency support for each subcarrier, is, in fact, the analog counterpart of digital OFDM spread spectrum technique [23] 24] and the underlying multicarrier spread spectrum (MC SS) approach for multicarrier (MC) CDMA with overlapping subcarriers [27]. By exploiting multiple carriers and a narrowband DS waveform on each subcarrier, it has been shown that multicarrier DS CDMA outperforms single carrier CDMA for wideband transmissions in the presence of narrowband interference [16] results for partial time jamming may be found in [5] ....

....devices and digital signal processing (DSP) technologies, the digital to analog (D A) and analog to digital (A D) converters are being pushed closer to the transceiver s end. A unifying digital implementation framework of many existing schemes has been developed [10] 26] which includes MC CDMA [27] and MC DS CDMA [16] as special cases. In this paper, we focus on the single user scenario where the narrowband signals are spread over a much wider bandwidth to combat narrowband interference and multipath fading. Starting from a discrete time equivalent model, we investigate the performance of ....

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N. Yee, J.-P. Linnartz, and G. Fettweis, "Multicarrier CDMA in indoor wireless radio networks," in Proc. IEEE PIMRC, Sept. 1993, pp. 109--113.

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N. Yee, J. P. Linnartz and G. Fettweis, "Multi-Carrier CDMA in Indoor Wireless Radio Networks," Proceedings PIMRC '93, Yokohama, Japan, 1993, pp. 109-113.

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N. Yee, J.P. Linnartz, and G. Fettweis, "Multi-Carrier CDMA in Indoor Wireless Radio Networks," in Proc. IEEE PIMRC `93, Yokohama, Japan, Sept. 9-11, 1993, pp. 109-103.

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N. Yee, J. P. Linnartz, and G. Fettweis, "Multi-carrier CDMA in indoor wireless radio networks," Proc. IEEE PIMRC'93, pp. 109--113, Sept. 1993.

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N. Yee, J. P. Linnartz and G. Fettweis, "Multi-Carrier CDMA in Indoor Wireless Radio Networks," Proceedings PIMRC '93, Yokohama, Japan, 1993, pp. 109-113.

No context found.

N.Yee, J.P.M.G.Linnartz, and G.Fettweis. Multi-Carrier CDMA in Indoor Wireless Radio Networks. Proceedings PIMRC'93, Yokohama, Japan, 1993, pp.109-113.

No context found.

N. Yee, J.P. Linnarz, G. Fettweis, "Multi-Carrier CDMA in indoor wireless radio networks," in IEEE international symposium on Personal, Indoor and Mobile Radio Communications (PIMRC '93), September 1993, pp. 109--113.

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N. Yee, J.P. Linnartz and G. Fettweis: "Multicarrier CDMA in indoor wireless radio networks, " Proc. of PIMRC'93, Yokohama, pp. 109-113, September 1993.

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N. Yee, J.P. Linnartz, and G. Fettweis. Multi--Carrier CDMA in Indoor Wireless Radio Networks. In proceedings of IEEE PIMRC, pages 109--

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N. Yee, J.P. Linnartz, and G. Fettweis. Multi--Carrier CDMA in Indoor Wireless Radio Networks. In proceedings of IEEE PIMRC, pages 109--113, Yokohama, Japan, September 1993.

No context found.

N. Yee, J.P. Linnartz, and G. Fettweis. Multi--Carrier CDMA in Indoor Wireless Radio Networks. In proceedings of IEEE PIMRC, pages 109--113, Yokohama, Japan, September 1993.

No context found.

N. Yee, J-P. Linnartz, and G. Fettweis, "Multicarrier CDMA in indoor wireless radio networks," in Proceedings of PIMRC. September 1993, pp. 109--113, IEEE.

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Yee N., Linnartz J.-P., Fettweis G. "Multi-Carrier CDMA in Indoor Wireless Radio Networks". In Proc. IEICE Transaction on Communications, volume E77-B7, No. 7, Japan. 1996.

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N. Yee, J. P. Linnartz, and G. Fettweis, "Multi-carrier CDMA in indoor wireless radio networks," in Proc. Personal, Indoor, Mobile Radio Communications Conf., Sept. 1993, pp. 109--113.

No context found.

N. Yee, J.-P. Linnartz, and G. Fettweis, "Multi-carrier CDMA in indoor wireless radio networks," in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Yokohama, Japan, Sept. 1993, pp. 109--113.

No context found.

N. Yee, J.-P. Linnartz, and G. Fettweis, "Multicarrier CDMA in indoor wireless radio networks," in Proc. IEEE PIMRC, Sept. 1993, pp. 109--113.

No context found.

N. Yee, J-P. Linnartz, and G. Fettweis, "Multicarrier CDMA in indoor wireless radio networks," in Proc. IEEE PIMRC,Sept. 1993, pp. 109--113.

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