Variable-rate adaptive channel coding for CDMA-Reverse Link

Lau, Vincent K. N.

doi:10.1002/bltj.2256

Cited by 3 publications

(2 citation statements)

References 16 publications

(10 reference statements)

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“…Since the channel fading is independent between fading blocks, the transmitted symbol in the current fading block, , is, therefore, a function of the current feedback CSIT only. 4 Due to the causal feedback assumption, only symbol-by-symbol transmission is allowed on the feedback channel. With the causal feedback constraint, no encoding on the CSIT could be done on the feedback channel, because the receiver does not have the future realization of the channel state 4 Since we are dealing with independent and identically distributed (i.i.d.…”

Section: B Feedback Channel Modelmentioning

confidence: 99%

On the Design of MIMO Block-Fading Channels With Feedback-Link Capacity Constraint

Lau¹,

Liu

Chen³

2004

IEEE Trans. Commun.

258

184

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Section: B Feedback Channel Modelmentioning

confidence: 99%

On the Design of MIMO Block-Fading Channels With Feedback-Link Capacity Constraint

Lau¹,

Liu

Chen³

2004

IEEE Trans. Commun.

258

184

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“…The average BER of Event 3 can be analyzed following the same steps as in the context of Event 2, except that is now replaced by . The average BER of Event 3 can be expressed as (11) Finally, by considering the above three possible events, the average BER of the bits in the th frame can be written as shown in (12) at the bottom of the next page.…”

Section: Throughput and Ber Analysismentioning

confidence: 99%

Adaptive Rate DS-CDMA Systems Using Variable Spreading Factors

Yang

Hanzo

2004

IEEE Trans. Veh. Technol.

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Abstract-In this contribution, adaptive rate transmissions are investigated in the context of direct-sequence code-division multiple-access (DS-CDMA) systems using variable spreading factors (VSFs). In the context of the recently established family of adaptive rate-transmission schemes, the transmission rate is typically adapted in response to the channel's fading-induced quality fluctuation. By contrast, in this contribution the transmission rate is adapted in response to the multiuser interference fluctuations encountered. We present the philosophy of the proposed adaptive rate-transmission scheme and analyze the effective throughput as well as the achievable bit error rate (BER) performance, when communicating over additive white Gaussian noise channels. Our study shows that by employing the proposed VSF-assisted adaptive rate-transmission scheme, the effective throughput may be increased by up to 40%, when compared to that of DS-CDMA systems using constant spreading factors. This increased throughput is achieved without wasting power, without imposing extra interference upon other users, and without increasing the BER.Index Terms-Adaptive rate transmissions, code-division multiple access (CDMA), Markov chain, matched filter receiver, multiuser interference, throughput, variable spreading factors (VSFs).

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