OFDM for data communication over mobile radio FM channels. I. Analysis and experimental results

Casas, E.; Leung, Cyril

doi:10.1109/26.87141

Cited by 70 publications

(18 citation statements)

References 23 publications

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“…Finally, it is shown that the downlink data rate requirements of emerging wireless standards can be achieved. For example, 1 Gbps downlink data throughput is achieved with area cost of the iterative detector-decoder of approximately 73 mm 2 and with power dissipation of about 2 W , if 0.13 μm CMOS technology is utilized.…”

Section: Discussionmentioning

confidence: 99%

“…In order to achieve this, it is proposed that multiple transmit antennas are accompanied with multiple receive antennas forming multiple-input multiple-output (MIMO) wireless transceivers [1]. Orthogonal Frequency Division Multiplexing (OFDM) transmission scheme [2] has been widely accepted for future wireless standards. It transforms highly scattering channel environments into frequency non-selective sub-carrier channels that are equalized with decent computational complexity.…”

mentioning

confidence: 99%

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Probabilistically bounded soft sphere detection for MIMO-OFDM receivers: algorithm and system architecture

Radosavljevic¹,

Guo

Cavallaro

2009

IEEE J. Select. Areas Commun.

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Abstract-Iterative soft detection and channel decoding for MIMO OFDM downlink receivers is studied in this work. Proposed inner soft sphere detection employs a variable upper bound for number of candidates per transmit antenna and utilizes the breath-first candidate-search algorithm. Upper bounds are based on probability distribution of the number of candidates found inside the spherical region formed around the received symbolvector. Detection accuracy of unbounded breadth-first candidatesearch is preserved while significant reduction of the search latency and area cost is achieved. This probabilistically bounded candidate-search algorithm improves error-rate performance of non-probabilistically bounded soft sphere detection algorithms, while providing smaller detection latency with same hardware resources. Prototype architecture of soft sphere detector is synthesized on Xilinx FPGA and for an ASIC design. Using area-cost of a single soft sphere detector, a level of processing parallelism required to achieve targeted high data rates for future wireless systems (for example, 1 Gbps data rate) is determined.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Probabilistically bounded soft sphere detection for MIMO-OFDM receivers: algorithm and system architecture

Radosavljevic¹,

Guo

Cavallaro

2009

IEEE J. Select. Areas Commun.

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“…(34) we can immediately recognize that the received signal can be expressed in exactly the same form as eq. (6). Therefore the algorithm properties do not change with respect to a static clock phase error shorter than T,.…”

Section: Static Clock Phase Errormentioning

confidence: 91%

A novel carrier recovery technique for orthogonal multicarrier systems

Daffara

Adami

1996

Trans Emerging Tel Tech

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Abstract. This paper deals with the carrier frequency synchronization of orthogonal multicarrier systems, which are an effective transmission technique for coping with the typical channel impairments present in mobile reception. A new carrier frequency detector is introduced and its performance thoroughly analyzed in the presence of a multipath channel. In particular we have analytically derived the frequency detector characteristic curve and its noise power spectral density. We have compared the new algorithm with other known algorithms and we have shown that it permits a considerable improvement in the noise level to be achieved. Therefore the proposed algorithm seems to be a valid candidate for carrier frequency recovery in applications employing multicanier transmission.

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“…This can be explained by the fact that this channel has a larger delay-spread than 2 Note that if for some channels D < L we will notice some performance degradation, if the receiver doesn't compensate for the intersymbol interference due to the small guard period. 3 In [3] ZP-OFDM significantly outperformed CP-OFDM (both with IDFT), but the authors of [3] evaluated coded performance with a receiver employing the turbo principle.…”

Section: Performance Evaluationmentioning

confidence: 95%

“…The replacement of the cyclic prefix with zero-padding, has the advantage that the symbol recovery is guaranteed even in the case of channel nulls on a subcarrier. On the other hand, it requires employing a receiver more sophisticated than the DFT-based receiver [2]. It has been shown, however, in [3] that by using a complex iterative receiver, ZP-OFDM outperforms CP-OFDM.…”

Section: Introductionmentioning

confidence: 97%

Zero-padded OFDM with improved performance over multipath channels

Papadimitriou

Georghiades²

2003 International Symposium on VLSI Technology, Systems and Applications. Proceedings of Technical Papers. (IEEE Cat. No.03TH8

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It has been proposed recently to replace the cyclic prefix (CP) in OFDM transmission by zero-padding (ZP), which guarantees symbol recovery even when channel nulls are located on a subcarrier. This, though, has the disadvantage that the simple DFT-based receiver does not perform well, but results have shown that if much higher complexity turbo demodulation is used, ZP-OFDM outperforms CP-OFDM. However, by viewing N-carrier OFDM as multicode CDMA with complex spreading codes from the N-PSK alphabet, one can apply to ZP-OFDM the numerous suboptimum multi-user receivers developed for CDMA. The performance of these receivers is dictated by the correlation properties of the IDFT matrix. Therefore, we propose to "modify" the IDFT matrix used to modulate the data in ZP-OFDM so that the resulting matrix possesses better correlation properties, and hence improved performance over multipath channels can be achieved. Simulation results verify the large gains in the uncoded performance of ZP-OFDM with modified IDFT matrix compared to CP-OFDM and ZP-OFDM with the IDFT matrix.

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OFDM for data communication over mobile radio FM channels. I. Analysis and experimental results

Cited by 70 publications

References 23 publications

Probabilistically bounded soft sphere detection for MIMO-OFDM receivers: algorithm and system architecture

Probabilistically bounded soft sphere detection for MIMO-OFDM receivers: algorithm and system architecture

A novel carrier recovery technique for orthogonal multicarrier systems

Zero-padded OFDM with improved performance over multipath channels

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