An ATSC DTV Receiver With Improved Robustness to Multipath and Distributed Transmission Environments

Frequency domain concurrent channel equalization for multicarrier systems

“…Specifically, we compare the symbol error rate (SER) [1] of the IQ baseband output sequence in Figure 4, with and without the aid of the FDCCE, for the ISDB-T system operating in Mode I: 2048 total carriers, 64-QAM mapping, OFDM symbol duration 252μs and ¼ guard interval [6]. For the performance evaluation, we adopt the Brazil A-E channel multipath profiles [7] shown in Tables 2-5 with a channel bandwidth of 6 MHz. In order to evaluate the FDCCE performance under dynamic multipath, we apply Doppler rotation to the echo with highest amplitude level [10].…”

Analysis of Cyclic Delay Diversity on DVB-H Systems over Spatially Correlated Channel

“…Both the theoretical and simulated results give the valuable insight that the CDD is able to obtain diversity gain to a certain extent under spatially correlated channel. The results also suggested a significant improvement in the performance of digital broadcasting systems [10], [11] in particular for mobile receiver in non-line of sight environment when CDD is applied. This paper is organized as follows: Section II introduces the system description, CDD extension on OFDM system and 0018-9316/$25.00 © 2007 IEEE MIMO channel modeling.…”

“…In frequency domain, the receive signal is represented as: (8) where , , , denote the frequency domain representations of subcarrier of the received signal for the antenna, complex channel gains between antenna, and noise signal for the receive antenna, respectively. Finally, the MIMO channel model is expressed as (9) where (10) For the uncorrelated MIMO channel, it is assumed the channel is sufficiently spatially separated to ensure decorrelation of the multipath signals. The benefits of MIMO transmit diversity are realized when the fading on received signals from the two channels are decorrelated, that is, the signals are faded independently as shown in Fig.…”

Analysis of DVB-H Network Coverage With the Application of Transmit Diversity

“…CDD diversity techniques lower the CNR threshold required by the receiver to achieve a satisfactory quality of service (QoS) and maintain coverage area. This can result in a significant improvement in system performance by a digital TV network [9]- [11] particularly for non line of sight (NLOS) signals at mobile receivers.…”

“…Considering (2), the average signal power for each diversity branch in dBW scale is: (8) Ignoring thermal noise in the presence of the inner interference and outer interference, the average interference power for each diversity branch in dBW is (9) For the th signal component the received signal power, may contribute to the useful part of the combined signal or the interfering part or to both parts depending on the relative delay. The ratio between the useful contribution, and the interfering contribution, , of the th signal component is modeled by the weighting function where represents the signal delay relative to the starting point of the receiver detection window [14].…”