Evolution of wireless data services: IS-95 to cdma2000

Knisely, D.; Kumar, S.; Laha, Subhasis; Nanda, Sanjiv

doi:10.1109/35.722150

Cited by 165 publications

(68 citation statements)

References 4 publications

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“…where P i is the transmission power and h i is the path loss (a priori known) of the ith user, W is the bandwidth, 1 and R 1 are rate and QoS requirements for voice, which should be satisfied with equality, N is the number of users in the cell, 0 and I E are respectively, thermal noise and external interference power spectral densities. Given a user configuration in the cell and using the development presented in Reference [2], extended for multi-cell case via [8], the capacity is given by (see Annex 1):…”

Section: Conventional Schemementioning

confidence: 99%

“…p is the maximum transmission power constraint for the class and this solution was obtained by taking 1 and R 1 equal to their minimum specified values (since the frequency reuse efficiency in Reference [8] is defined as…”

Section: Conventional Schemementioning

confidence: 99%

“…Third generation mobile communications systems, particularly, direct sequence-code division multiple access (DS/CDMA) access interface, will be required to support not only speech, but also variable data rate transmission (images, e-mail, file transfer, Internet and corporate network access), video and multimedia services [1]. To provide this, they should optimize their capacities and support users with different rates, quality of service (QoS), delay and power requirements [2].…”

Section: Introductionmentioning

confidence: 99%

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Passas¹,

Paskalis²,

Kaloxylos³

et al. 2006

Wireless Communications

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SummaryThis paper presents and compares the capacities of multi-cell and power constrained direct sequence-code division multiple access (DS/CDMA) systems with different transmission or detection schemes. In the single-class case (voice), we considered conventional and successive interference cancellation (SIC) schemes, determining the maximum number of users of each mode. Next, modeling and results proposed in the literature are extended for multi-cell dual-class systems (voice and data) and we compare the maximum data throughputs obtained with conventional, SIC and scheduling (transmission) schemes, for some user configurations.

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Section: Conventional Schemementioning

confidence: 99%

Section: Conventional Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Untitled

Passas¹,

Paskalis²,

Kaloxylos³

et al. 2006

Wireless Communications

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“…As seen in Table 1, the radio access technology of both systems is based on narrow-band DS-CDMA with a chip rate of 1.2288 Mc/s, which gives a bandwidth of 1.25 MHz. IS-95-A was introduced in 1995, supporting a maximum bit rate of 14.4 kb/s [70], [72]. An enhancement to the IS-95-A standards, known as IS-95-B, was launched in 1998 with the objective of supporting data rates up to 115.2 kb/s [74], [18], [62], while essentially retaining the physical layer of the original IS-95-A system.…”

Section: ) Umts and Imt-2000mentioning

confidence: 99%

“…2) The cdma2000 System [70]- [72]: The current 2G CDMA-based mobile radio systems standardized by the Telecommunications Industry Association (TIA) in the United States are IS-95-A and IS-95-B [70], [72]. As seen in Table 1, the radio access technology of both systems is based on narrow-band DS-CDMA with a chip rate of 1.2288 Mc/s, which gives a bandwidth of 1.25 MHz.…”

Section: ) Umts and Imt-2000mentioning

confidence: 99%

Interactive cellular and cordless video telephony: State-of-the-art system design principles and expected performance

2000

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Second-generation (2G) mobile radio standards have not been designed with video communications in mind, although the employment of error-resilient, constant-bit-rate proprietary video codecs over these systems is realistic. The third-generation (3G) systems I. STATE-OF-THE-ART SYSTEM COMPONENT DEVELOPMENTS A. Introduction and OutlineThe subject of mobile radio communications has reached a state of maturity over the past two decades, as indicated by the excellent monographs by Jakes This contribution attempts to summarize a range of recent advances in the field of bandwidth-efficient wireless video communications. In this section, we commence our discourse with a brief overview of the wireless scene and, in particular, by considering the video transmission capabilities of the existing and future wireless systems. The geographical variation of the cellular channel capacity is characterized by Section II, as a motivation for invoking burst-by-burst adaptive transceivers [27]- [29]. The nature of co-channel interference (CCI)-which is the most dominant channel impairment in wireless systems-is the topic of Section III, where it is shown that the geographic variation of CCI justifies the employment of multimode transceivers, which are discussed in Section IV. Low-rate video compression aspects are reviewed in Section V, and the performance of the ITU H.263 codec is analyzed in some depth. Our discussions in Sections VI and VII are focused on the performance of reconfigurable video transceivers. Specifically, in Section VI, no power control is used-which is typically the case in cordless telephones, such as DECT and CT2-while in Section VII, power control is employed, which is characteristic of cellular systems, such as GSM [30], etc. Section VIII proposes a near-instantaneously adaptive or burst-by-burst adaptive code-division multiple-access (CDMA) scheme, which can be invoked in the context of the forthcoming 3G systems, in order to enhance their performance. Lastly, our discussions are concluded in Section IX with a range of system design guidelines. Let us now commence our overview of the range of existing and forthcoming wireless systems and their video transmission capabilities. B. Second-Generation (2G) Wireless SystemsThe existing 2G wireless systems now constitute a mature technology. Although they have not been designed with video communications in mind, with the advent of the specially designed error-resilient, fixed-rate video codecs [27]-[35] proposed by Streit et al., it is nonetheless realistic to provide videophone services over these low-rate schemes. For low-latency interactive videophony these systems have

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