space division multiple access in mobile communication

... region should increase linearly in each dimension as ρ increases lin- early in dB. As a result, we would also expect the outage ca- pacity region to increase linearly in each dimension as ρ in- creases. ... since one mobile may transmit at any time. A tighter inner bound may be obtained by allowing the two mobiles to transmit si- multaneously, but without the coordinating virtual central processing ... Signal Processing 2004:9, 1288–1298 c  2004 Hindawi Publishing Corporation Bounds on the Outage-Constrained Capacity Region of Space- Division Multiple- Access Radio Systems Haipeng Jin Center for...

Ngày tải lên: 23/06/2014, 01:20

... to Summon Information 380 19.6 Pointing to the Real World 380 19.7 Pointing Greatly Simplifies the User Interface 381 19.8 Uses of Pointing 382 19.9 Software Architecture 382 19.9.1 Introduction ... DSP in the Pointing System 383 19.11 Pointing Enhanced Location Applications 384 19.11.1 Pedestrian Guidance 385 19.11.2 Pull Advertising 386 19.11.3 Entertainment 386 19.12 Benefits of Pointing ... Personal Mobile Gateway TM (IXI Mobile Inc.) the following steps must be performed to reverse each of the corresponding steps in the transmitter: † De-multiplexing of transport channels † De-interleaving...

Ngày tải lên: 18/04/2014, 12:06

... mobility. Terminals moving fast in a dense network would necessitate a lot of cell updates, increasing the RACH load, but would then need to be paged in multiple cells in case of downlink-originated ... not retained, and to allow reordering to be done for single packet streams the reordering functionality needs to be combined with macro-diversity combining in MAC-es. Thus, the new MAC-es in- sequence ... rate of 384 kbps both in downlink and in uplink. The initial terminals and networks were limited to 64–128 kbps in uplink while the latest products provide 384-kbps uplink. 1.2 HSPA standardization...

Ngày tải lên: 01/06/2014, 09:38

... computational model inspired by evolution. It represents feasible solutions in terms of individuals with genomes, and determines which individuals could survive in a certain criterion formulated ... planning. In [2], a binary string representation, the classic representation method of genetic algorithm, is applied. That is, candidate solutions are encoded as chromosome-like bit strings. In ... to explain how the GA works. According to the schema theo- rem, short, low-order, and above-average schemata receive exponentially increasing trials in subsequent generations. This proves that the individuals...

Ngày tải lên: 21/06/2014, 22:20

... The values in the table have been determined for a solution using turbo decoding and they do not include chip-le vel decoding and symbol level combining that further increase the processing needs. The ... anything in between 1-2 cycle instruction set extensions and peripheral devices executing thousands of cycles can result in grossly inefficient software. If the interrupt latency in the operating ... hardware interrupt 5, 6 = interrupt service and acknowledge interrupt to HW 9, 10 = high-priority running due to interrupt 1, 12 = interrupted low-priority task Figure 6: Controlling an accelerator interfaced...

Ngày tải lên: 22/06/2014, 19:20

... estimation schemes suitable for interleave -division multiple access (IDMA) systems are presented. Training and data are superimposed. Training-based and semiblind linear channel estimators are derived ... “Adaptive interleave -division multiple access a potential air interface for 4G bearer ser- vices and wireless LANs,” in Proceedings of the 1st IFIP Inter- national Conference on Wireless and Optical Communications Networks ... “Adaptive 4G up- link proposal based on interleave -division multiple access, ” in Proceedings of General Assembly of International Union of Radio Science (URSI ’05), New Delhi, India, October 2005. [12]...

Ngày tải lên: 22/06/2014, 23:20

... 64 2.8 Multiple Access Performance of Frequency-Hopped Code Division Multiple Access 67 2.9 Summary 71 3. Cellular Code Division Multiple Access 73 3.1 Principles of Cellular Code Division Multiple ... techniques such as time division multiple access and frequency division multiple access. Additionally, random access schemes such as carrier sense multiple access are examined. In Chapter 2, basic ... causing interference to another user. The orthogonality can be created either in the time domain or in the frequency domain. In TDMA, users simply transmit at different times, thus maintaining...

Ngày tải lên: 27/06/2014, 14:20

... including a provision to compensate subscribers in case of delay in porting or abuse of porting by them or on their behalf. 4.2.3 Mobile termination charges Call termination charges into mobile ... performance indicator chosen in this study for the mobile communications industry. 5.1.1.1 Productivity Productivity of service industries and especially mobile communications is hard to define. Indeed, ... these findings can’t be compared with findings in previous studies on mobile telecommunications, since most of them do not consider this performance indicator. Only very few studies examine the...

Ngày tải lên: 28/06/2014, 14:20

Ngày tải lên: 25/07/2014, 09:39

... techniques such as time division multiple access and frequency division multiple access. Additionally, random access schemes such as carrier sense multiple access are examined. In Chapter 2, basic ... 15:54 vi Contents 1. Multiuser Communications 1 1.1 Conflict-Free Medium Access Control 2 1.1.1 Time Division Multiple Access 3 1.1.2 Frequency Division Multiple Access 5 1.1.3 Code Division Multiple Access 6 1.1.4 ... 64 2.8 Multiple Access Performance of Frequency-Hopped Code Division Multiple Access 67 2.9 Summary 71 3. Cellular Code Division Multiple Access 73 3.1 Principles of Cellular Code Division Multiple...

Ngày tải lên: 07/08/2014, 21:20

... for Code Division Multiple Access In the previous chapter, we reviewed the basic concepts of multiuser communications and the multiple access techniques used to allow multiple users to communicate. In ... and fading channels as well as their multiple access capabilities. Both techniques rely on spreading waveforms to accomplish pseudo-random spreading. A key to CDMA is defining multiple spreading ... exploited to provide multiple access. In multiple access systems, we are concerned 1 Some make a distinction between CDMA and SSMA in that CDMA specifically designs its spreading waveforms to have...

Ngày tải lên: 07/08/2014, 21:20

Ngày tải lên: 07/08/2014, 21:20

Ngày tải lên: 07/08/2014, 21:20

Ngày tải lên: 07/08/2014, 21:20

Ngày tải lên: 07/08/2014, 21:20

Ngày tải lên: 07/08/2014, 21:20

Ngày tải lên: 07/08/2014, 21:20

Ngày tải lên: 07/08/2014, 21:20

Ngày tải lên: 07/08/2014, 21:20

Ngày tải lên: 23/08/2014, 02:02